International Journal of Quantum Chemistry

Papers
(The TQCC of International Journal of Quantum Chemistry is 4. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2020-10-01 to 2024-10-01.)
ArticleCitations
Topological indices and QSPR/QSAR analysis of some antiviral drugs being investigated for the treatment of COVID‐19 patients91
Molecular trees with extremal values of Sombor indices53
Distance based and bond additive topological indices of certain repurposed antiviral drug compounds tested for treating COVID‐1953
Topological indices and QSPR modeling of some novel drugs used in the cancer treatment52
A comprehensive computational investigations on the physical properties of TiXSb (X: Ru, Pt) half‐Heusler alloys and Ti2RuPtSb2 double half‐47
First‐principles calculations to investigate structural stabilities, mechanical and optoelectronic properties of NbCoSn and NbFeSb half‐Heusler compounds41
Prediction the structure, mechanical properties and melting point ofD8m‐Mo5SiB2andCmcm‐Mo5SiB240
A comparative review of 50 analytical representation of potential energy interaction for diatomic systems: 100 years of history40
The strength of a chemical bond39
Machine learning lattice parameters of monoclinic double perovskites37
Global optimization of chemical cluster structures: Methods, applications, and challenges37
Electronic and thermo‐physical properties of double antiperovskites X6SOA2 (X = Na, K and A = Cl, Br, I): A non‐toxic and efficient energy storage materials37
Molecular representations for machine learning applications in chemistry35
Quantum computational quantification of protein–ligand interactions30
More on Sombor indices of chemical graphs and their applications to the boiling point of benzenoid hydrocarbons30
Linear versus cubic regression models for analyzing generalized reverse degree based topological indices of certain latest corona treatment drug molecules29
Structural defects in graphene quantum dots: A review28
The expected values for the Gutman index, Schultz index, and some Sombor indices of a random cyclooctane chain28
Induced magnetic states upon electron–hole injection at B and N sites of hexagonal boron nitride bilayer: A density functional theory study27
Chemical insights into the electronic structure of Fe(II) porphyrin using FCIQMC, DMRG, and generalized active spaces27
Prediction of a new quaternary Heusler alloy within a good electrical response at high temperature for spintronics applications: DFT calculations27
Generalized unitary coupled cluster excitations for multireference molecular states optimized by the variational quantum eigensolver26
The role of quantum chemistry in covalent inhibitor design26
Li‐decorated Al2C monolayer as a potential template for hydrogen storage: A first‐principles perspective26
Simulating X‐ray absorption spectra with complete active space self‐consistent field linear response methods25
New insight into the structural, mechanical, electronic, and thermodynamic properties of the monoclinicTMAl3‐type aluminides25
SVECV‐f12: Benchmark of a composite scheme for accurate and cost effective evaluation of reaction barriers22
Exploring the potential of tetraazaacene derivatives as photovoltaic materials with enhanced photovoltaic parameters22
Quantitative structure–property relationship of Ev‐degree and Ve‐degree based topological indices : physico‐chemical properties of benzene derivatives22
Ro‐vibrational energy and thermodynamic properties of molecules subjected to Deng–Fan potential through an improved approximation21
Rotation vibration spectrum of potassium molecules via the improved generalized Pöschl‐Teller oscillator20
The expected values of Sombor indices in random hexagonal chains, phenylene chains and Sombor indices of some chemical graphs20
General cut method for computing Szeged‐like topological indices with applications to molecular graphs20
Quantitative structure–property relationship of edge weighted and degree‐based entropy of benzene derivatives19
Quantum embedding electronic structure methods19
Mechanically stable with highly absorptive formamidinium lead halide perovskites [(HC(NH2)2PbX3; X = Br, Cl]: Recent advances and pers18
On the inclusion of cusp effects in expectation values with explicitly correlated Gaussians18
Isobaric molar heat capacity model for the improved Tietz potential17
Prediction of double transition metal (Cr1−xZrx)2AlC MAX phases as thermal barrier coatings: Insight from density functional theory17
First‐principles quantum analysis of promising double perovskites Z2SiF6 (Z = K, Li, Na, Rb) as prospective light harvesting materials: Optoelectronic, stru17
First principles study of electronic, elastic, optical and magnetic properties of Rh2MnX (X = Ti, Hf, Sc, Zr, Zn) Heusler alloys17
State preparation and evolution in quantum computing: A perspective from Hamiltonian moments17
First‐principle study of the properties in BaTiO3 and the electronic structure of H2O adsorption on BaTiO316
High‐precision calculation of relativistic corrections for hydrogen‐like atoms with screened Coulomb potentials16
Gas sensing properties of Mg‐doped graphene for H2S, SO2, SOF2, and SO2F2 based on DF16
Computational engineering to enhance the photovoltaic by end‐capped and bridging core alterations: Empowering the future with solar energy through synergistic effect in D‐A mater16
Quantitative structure–properties relationship analysis of Eigen‐value‐based indices using COVID‐19 drugs structure16
Density functional theory study of the electronic properties and quantum capacitance of pure and doped Zr2CO2 as electrode of supercapacitors15
Topological analysis of para‐line graph of Remdesivir used in the prevention of corona virus15
The fire extinguishing mechanism of ultrafine composite dry powder agent containing Mg(OH)214
Microsolvation of heavy halides14
Salen type additives as corrosion mitigator for Ni–W alloys: Detailed electronic/atomic‐scale computational illustration14
The information theory of the helium atom in screened Coulomb potentials14
Effects of the atomic number of alkali atom and pore size of graphyne on the second‐order nonlinear optical response of superalkali salts of graphynesOM3+@GYs13
A molecular electron density theory study for [3 + 2] cycloaddition reactions of1‐pyrroline‐1‐oxide with disubstituted acetylenes leading to bicyclic 4‐isoxazolines13
Robustness in ferromagnetic phase stability, half‐metallic behavior and transport properties of cobalt‐based full‐Heuslers compounds: A first principles approach13
Mostar indices of SiO2 nanostructures and melem chain nanostructures13
Canonical versus explicitly correlated coupled cluster: Post‐complete‐basis‐set extrapolation and the quest of the complete‐basis‐set limit13
Analyzing the effects of magnetic and Aharonov‐Bohm (AB) flux fields on the energy spectra and thermal properties of N2, NO, CO and 13
A density matrix renormalization group investigation on the electronic states of MnGen−/0/+ (n = 1–3) clusters13
First principles study of layered silicon carbide as anode in lithium ion battery13
Adsorption ability of Ga5N10 nanomaterial for removing metal ions contamination from drinking water by DFT13
Information and thermodynamic properties of a non‐Hermitian particle ensemble12
Computation of entropy measures for phthalocyanines and porphyrins dendrimers12
The basics of quantum computing for chemists12
Stability of the helium atom embedded in classical nonideal plasmas12
Computation of Mostar index for some graph operations11
Chirality–helicity of cumulenes: A non‐scalar charge density derived perspective11
The use of machine learning, density functional theory, and molecular dynamics simulations for the designing and screening of efficient small molecule donors for organic solar cells11
Schrödinger–Pauli theory of electrons: New perspectives11
Multidimensional modeling assisted mining of GDB17 chemical database: A search for polymer donors for organic solar cells and machine learning assisted performance prediction11
Enhancement of air stability and photovoltaic performance in organic solar cells by structural modulation of bis‐amide‐based donor‐acceptor copolymers: A computational insight11
Statistical properties of linear Majorana fermions11
Strain effects on the structural, electronic, optical and thermoelectric properties of Si2SeS monolayer with puckered honeycomb structure: A first‐principles study11
Benchmarking PES‐Learn's machine learning models predicting accurate potential energy surface for quantum scattering11
Molecular structural characterization of superphenalene and supertriphenylene11
Sustainable packaging of quantum chemistry software with the Nix package manager11
Inhibitory effect of Zn2+ on the chain‐initiation process of cumene oxidation11
Fisher information and density functional theory10
Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity10
Mechanical behavior of high entropy carbide (HfTaZrTi)C and (HfTaZrNb)C under high pressure: Ab initio study10
Performance of NO2‐rich multifunctionalized C60 derivatives as new high‐energy‐density nanomaterials10
Arsenene, antimonene and bismuthene as anchoring materials for lithium‐sulfur batteries: A computational study10
An introduction to analysis of Rényi complexity ratio of quantum states for central potential10
Interaction of 5‐fluorouracil with β‐cyclodextrin: A density functional theory study with dispersion correction10
Electron density and its reduced density gradient in the study of π–π interactions10
On entropy measures for molecular structure of remdesivir system and their applications10
Lithium decorated C3N as high capacity reversible hydrogen storage material: Insights from density functional theory10
Exploring the enhanced performance of Sb2S3/doped‐carbon composites as potential anode materials for sodium‐ion batteries: A density functional theory appro9
Quality testing analysis of Ve‐degree based entropies by using benzene derivatives9
New implementation of spin‐orbit coupling calculation on multi‐configuration electron correlation theory9
Activity and stability descriptors of Ni based alloy catalysts for dry reforming of methane: A density functional theory study9
A theoretical assessment of the structural and electronic features of some retrochalcones9
Extremal values of vertex‐degree‐based topological indices of coronoid systems9
Quantum chemical calculation, topological analysis, biological evaluation and molecular docking of allo‐ocimenol against breast cancer9
On the study of influence of molecular arrangements and dipole moment on exciton binding energy in solid state9
Uncommonly accurate energies for the general quartic oscillator9
Computing and comparative analysis of topological invariants of Y‐junction carbon nanotubes9
Superatomic nature of metal encapsulated dodecahedrane: The case of M@C20H20 (M = Li, Na, Mg+)9
A systematic benchmarking of 31P and 19F NMR chemical shift predictions using different DFT/GIAO methods and applying linear regression to improv9
Atomistic insights into lithium adsorption and migration on phosphorus‐doped graphene9
ADMET and quantitative structure property relationship analysis of anti‐Covid drugs against omicron variant with some degree‐based topological indices9
Predictive ability of physicochemical properties of antiemetic drugs using degree‐based entropies8
Geometric evolution, electronic structure, and vibrational properties of ScGen (n = 6–17) anion clusters: A DFT insight8
Topological indices and QSPR analysis of some chemical structures applied for the treatment of heart patients8
Modulating spintronic properties of transition metals doped GaN nanotubes with high Curie temperature8
DFT study of structural, mechanical, thermodynamic, electronic, and thermoelectric properties of new PdTiZ (Z = Ge and Pb) half Heusler compounds8
Optical response of plasma processed quantum dot under the external fields8
Ultra‐compact accurate wave functions for He‐like and Li‐like iso‐electronic sequences and variational calculus: I. Ground state8
Automating the IRC‐Analysis within Eyringpy8
The performance of hybrid and F12∗/F12c explicitly correlated coupled cluster methods for use in anharmonic vibrational frequency computations8
Theoretical study on the atmospheric degradation mechanism and subsequent products of E,E‐2,4‐hexadienal with hydroxyl radical8
Fatigue and fatigue resistance in S1 excited state diarylethenes in electric fields8
Topological index analysis of a class of networks analogous to alicyclic hydrocarbons and their derivatives8
Parameterization and validation of a new force field for Pt(II) complexes of 2‐(4′‐amino‐2′‐hydroxyphenyl)benzothiazole8
Control of chirality, bond flexing and anharmonicity in an electric field8
Development of various methods to the investigation of the spectral properties and collision dynamics of H‐like ions taking place in dense and hot plasma environments8
Deterministic quantum mechanics: The role of the Maxwell–Boltzmann distribution8
Density functional theory study of graphene adhesion on WX2 (X = S and Se) monolayer: Role of atom vacancy and atomic reorganization defects7
A bonding evolution theory study of the reaction between methylidyne radical, CH(X2Π), and cyclopentadiene, C5H67
Structural investigation of carbon nanocone through topological coindices7
Iterative quantum phase estimation with variationally prepared reference state7
Theoretical studies on how to tune the π‐hole pnicogen bonds by substitution and cooperative effects7
Numerical solution of Schrodinger equation for rotating Morse potential using matrix methods with Fourier sine basis and optimization using variational Monte‐Carlo approach7
Structural, electronic, magnetic, and optical properties of MFe2O4 (M = Ni, Fe, Co) spinel ferrites: A density functional theory study7
Accurate redox potentials for solvents in Li‐metal batteries and assessment of density functionals7
Accelerating optical reporting for conformation of tyrosine kinase inhibitors in solutions7
Eccentricity‐based topological invariants of tightest nonadjacently configured stable pentagonal structure of carbon nanocones7
IRMOF‐8: Theoretical evaluation of aluminum doping on hydrogen, methane, and hydrogen sulfide adsorption7
First‐principles study on the methane adsorption properties by Ti‐modified graphyne7
Generalized relativistic small‐core pseudopotentials accounting for quantum electrodynamic effects: Construction and pilot applications7
A viewpoint on population analyses7
Molecular engineering of triphenylamine‐based metal‐free organic dyes for dye‐sensitized solar cells7
First‐principles investigation of Rb2Ag(Ga/In)Br6 for thermoelectric and photovoltaic applications7
Exploring the co‐activity of FDA approved drug gemcitabine and docetaxel for enhanced anti‐breast cancer activity: DFT, docking, molecular dynamics simulation and pharmacophore s7
Ability ofB12N12fullerene like nano‐cage for sensing and improving the antioxidant activity of juglone and its derivative: Density functional theory investigation7
Evaluation of the performances of different atomic charge and nonelectrostatic models in the finite‐difference Poisson–Boltzmann approach7
Quantum‐phase transitions in 1D Heisenberg spin systems7
Generalized quantum similarity index: An application to pseudoharmonic oscillator with isospectral potentials in 3D7
The thermal decomposition behavior of the TNT‐RDX‐Al explosive by molecular kinetic simulation7
Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems7
Designing of cyanobenzene based small molecules with suitable photovoltaic parameters for organic solar cells7
Computational design and screening of promising energetic materials: The coplanar family of novel heterocycle‐based explosives7
Calculation of information entropies for the 1s2 state of helium‐like ions7
Effects of 4d transition metals doping on the photocatalytic activities of anatase TiO2 (101) surface7
Topological aspects of cavity‐induced degeneracies in polyatomic molecules7
Microsolvation of Sr2+, Ba2+: Structures, energies, bonding, and nuclear magnetic shieldings7
Unusual substituent effects in the Tr···Te triel bond7
Single Si‐doped fullerene as a catalyst in the oxygen reduction reaction: A quantum chemical insight7
Effects of microstructural tailoring on Na storage performance of graphene7
A study of two‐dimensional coronene fractal structures with M‐polynomials6
A user‐friendly, Python‐based quantum mechanics/Gromacs interface: gmx2qmmm6
Geometric approach to vertex‐degree‐based topological indices–Elliptic Sombor index, theory and application6
Bandgaps in free‐standing monolayer TiO2: Ab initio diffusion quantum Monte Carlo study6
The catalytic effects of H2O, basic and acidic catalysts on the gas‐phase hydrolysis mechanism of carbonyl fluoride (CF2O)6
Exponentially correlated Hylleraas‐configuration interaction nonrelativistic energy of the 1S ground state of the helium atom6
Quantum information of the modified Mobius squared plus Eckart potential6
Transition metals doped (3,3) armchair boron nitride nanosheet as dilute magnetic semiconductors materials for the spintronic application6
Structural stability, elasticity and minimum thermal conductivity of M‐doped Mg17Al12 (M = Ga, In, Ge, Sn, Pb) compounds: A first‐principles predictions6
Quantum‐chemical approaches in the study of fullerene and its derivatives by the example of the most typical cycloaddition reactions: A review6
Strain effects on electronic, optical properties and carriers mobility of Cs2SnI6 vacancy‐ordered double perovskite: A promising photovoltaic material6
On topological indices and entropies of diamond structure6
Tuning the photophysical properties of BODIPY dyes used in DSSCs as predicted by double‐hybrid TD‐DFT: The role of the methyl substituents6
A first principles study of nonlinear optical properties of a quinoline derivative6
A DFT study on NHC‐catalyzed [4 + 2] annulation of 2H‐azirines with ketones: Mechanism and selectivity6
CO oxidation mediated by Al‐doped ZnO nanoclusters: A first‐principles investigation6
Temperature‐dependent electronic properties for 4f states in cerium mononitride6
Discerning torquoselectivity in a series of cyclobutene ring‐opening reactions using quantum theory of atoms in molecules and stress tensor6
First principle investigations of long‐range magnetic exchange interactions via polyacene couplers6
Regulating electronic properties of BiOBr to enhance visible light response via 3d transition metals doping: DFT + U calculations6
On the signless Laplacian Estrada index of uniform hypergraphs6
Potential energy surface of the thiophene pentamer and non‐covalent interactions6
Role of molecular descriptors in quantitative structure‐property relationship analysis of kidney cancer therapeutics6
Carbon nanotube‐based titanium‐ and zirconium‐doped [M–N4] type ORR catalysts. First principle study6
Study of non‐adiabatic interactions among low‐lying electronic states of HeH2+ with its implication in its dissociation into various species6
Terminal and bridging ligand effects on M(I)M(I) multiple bonding: ADFTinvestigation of the coordination in (X)[M2Cl]L2complexes (6
Ultra‐compact accurate wave functions for He‐like and Li‐like iso‐electronic sequences and variational calculus:II.Spin‐singlet (excited) and spin‐triplet (lowest) states of heli6
The electronic states and vibronic absorption spectrum of berberine in aqueous solution6
Structural, elastic, mechanical, electronic, and magnetic properties of In2NbX6 (X = Cl, Br) variant perovskites6
Theoretical investigation of aromaticity and charge transfer in emission process of triarylmethyl radicals as OLED materials6
Face index of nanotubes and regular hexagonal lattices6
Deep learning for inverse problems in quantum mechanics5
Towards quantum state preparation with materials science: An analytical review5
Cisplatin under oriented external electric fields: A deeper insight into electrochemotherapy at the molecular level5
The confined helium atom: An information–theoretic approach5
Machine learning prediction of the optimal carrier concentration and band gap of quaternary thermoelectric materials via element feature descriptors5
H2 promoting effect in Cr/PNP‐catalyzed ethylene tetramerization: A density functional theory study5
SVECV‐f12: A composite scheme for accurate and cost‐effective evaluation of reaction barriers. II. Benchmarking using Karton's BH28 barrier heights database5
QSPR models to predict quantum chemical properties of imidazole derivatives using genetic algorithm–multiple linear regression and back‐propagation–artificial neural network5
Cellmetry: A first‐principle pKa determination by plane‐wave functions5
Origin of semiconductor and half‐metallic behaviors in the perovskite materials RbXF3 (X = Co, Mn, Fe or V): A GGA + U approach5
DFT study of electronic and structural properties of single‐walled gallium nitride nanotubes5
A comparative study of physical and thermoelectrical characteristics of the new full‐Heusler alloys Ag2TiGa and Ag2VGa with ab initio calculation5
Bond flexing, twisting, anharmonicity and responsivity for the infrared‐active modes of benzene5
First‐principles studies on structure stability, segregation, and work function of Mg doped with metal elements5
A study of two‐dimensional single atom‐supported MXenes as hydrogen evolution reaction catalysts using density functional theory and machine learning5
Comparative study of chitosan derivatives through CoM‐polynomial5
Quantitative structure–property relationship for the critical temperature of saturated monobasic ketones, aldehydes, and ethers with molecular descriptors5
Solvent‐dependent mechanistic aspects for the redox reaction of paraquat in basic solution5
Toward a two‐dimensional NbS2‐based electrode for lithium–ion batteries5
The electronic structure of the actinide oxides and their singly and doubly charged cations: A ligand field approach5
Modeling of the photophysical and photovoltaic properties of an active layer based on the organic composite poly(2‐methoxy‐5‐(2‐ethyl‐hexyloxy)‐1,4‐phenylene‐vinylene) (MEH‐PPV)–poly(3‐hexy5
Degree‐based topological indices of the molecular structure of hyaluronic acid–methotrexate conjugates in cancer treatment5
Binding properties of cucurbit[7]uril to neutral and protonated amino acids: A theoretical study5
P3CPenT as an organic hole transport layer for perovskite solar cells5
Potential energy curves, partition functions and line intensities of HF and HCl molecules under the improved Hulburt‐Hirschfelder quantum mechanical anharmonic oscillator model5
Plasmonic properties of nanohybrids made of metallic nanoring and benzene molecules5
Electronic and adsorption properties of the zigzag‐edged triangle graphene nanosheets5
Comment on: Uncommonly accurate energies for the general quartic oscillator5
The effect of vacancy defect on quantum capacitance, electronic and magnetic properties of Sc2CF2 monolayer5
Atmospheric oxidation of 4‐(2‐methoxyethyl) phenol initiated by OH radical in the presence of O2 and NOx: A mechanistic and kinetic st5
An algorithm to correct for the CASSCF active space in multiscale QM/MM calculations based on geometry ensembles5
Ab initio study of anisotropic properties in isomorphic TiX2 (X = S, Se, Te)5
Theoretical study of 8‐hydroxyquinoline derivatives as potential antennas in lanthanide complexes: Photophysical properties and elucidation of energy transfer pathways5
Slow light effect in hybrid optomechanical system5
Combining ab initio and machine learning method to improve the prediction of diatomic vibrational energies5
N2 electrochemical reduction on two dimensional transition metal monoborides: A density functional theory study5
Prediction of the interaction strength of an urea‐based probe toward ions in water by means of Density Functional Theory/Polarizable Continuum Model calculations5
Controllable fast light in quantum dot molecules assisted hybrid optomechanical system5
Splitting dioxygen over distant binuclear transition metal cationic sites in zeolites. Effect of the transition metal cation5
Computational insights into themulti‐Diels–Alderreactions of neutralC60and its Li+encapsulated analogue: A density functional theory study5
Δ‐SCF calculations of core electron binding energies in first‐row transition metal atoms5
Enhanced optoelectronic properties with aromatic bridges: A computational study on N‐methyl pyridinium and phenolate types of push‐pull zwitterions5
A density functional theory study of electronic properties of transition metals doped silicon carbide monolayer5
Theoretical investigation on the mechanism and enantioselectivity of organocatalytic asymmetric Povarov reactions of anilines and aldehydes5
The influence of cations on the dipole moments of neighboring polar molecules5
Benchmark density functional theory calculations of 13C NMR chemical shifts of the natural antimalarial compounds with a new basis set 3z‐S4
Exploring the potential of fluoro‐flavonoid derivatives as anti‐lung cancer agents: DFT, molecular docking, and molecular dynamics techniques4
A first‐principles approach for treating wastewaters4
The change in the nature of bonding in the Li2 dimer under confinement4
Electronic and optical properties of quaternary selenides for optoelectronic applications: Insights from DFT+U‐computations4
The minimal chemical tree for the difference between geometric–arithmetic and Randić indices4
Ultra‐compact accurate wave functions for He‐like and Li‐like iso‐electronic sequences and variational calculus: III. Spin‐quartet state (1s2s3s) 4
Size and shape effects on the stability, electronic structure, and Raman spectroscopy of (SrO)n nanoclusters4
Can the quasi‐molecule concept help in deciphering planarity? The case of polycyclic aromatic hydrocarbons4
First principle determination of stability constants of metal complexes by cellmetry method4
Computational study of inversion‐topomerization pathways in 1,3‐dimethylcyclohexane and 1,4‐dimethylcyclohexane: Ab initio conformational analysis4
Structural, electronic, elastic, magnetic and thermodynamic properties of Mn2LuZ (Z = B, Al, Ga and In) Heusler compounds: A first‐principle study4
Adsorption of organic molecules on graphene and fluorographene: An unresolved discrepancy between experiment and theory4
Exploring the scaling limitations of the variational quantum eigensolver with the bond dissociation of hydride diatomic molecules4
Density functional theory calculations on the adsorption and degradation characteristics of ronidazole on the TiO2 surface4
Theoretical study of magneto‐electronic properties of TmCo2 and NdCo2 intermetallic compounds through density functional theory calculations4
On Szeged‐type indices of titanium oxideTiO2nanotubes4
Influence on structural, electronic and optical properties of Fe doped ZnS quantum dot: A density functional theory based study4
Metameric influences on conformational selectivity for zwitterionic pyridinium cyclopentadienide and its aza analogues. Quantum mechanical studies on linear and nonlinear optoelectronic properties4
4
Theoretical study on the electronic properties and quantum capacitance ofZr2CO2MXenewith atomic swap4
Atomistic simulations of ∑3 [110](111) grain boundary in diamond: Structure, stability, and properties4
Sensing properties of nonmetal doped blue phosphorene toward NO and NO2 molecules: A first‐principles study4
Examining conductance values in the biphenyl molecular switch with reduced density matrices4
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