6533b822fe1ef96bd127d6ab
RESEARCH PRODUCT
DFT studies on the structural and vibrational properties of polyenes
Małgorzata A. BrodaAneta BuczekTeobald KupkaMichał StachówPrzemysław Tarnowskisubject
Models MolecularDouble bondPolyenes02 engineering and technologyConjugated systemSpectrum Analysis RamanVibrationC-C bondAll-trans polyenesDFT01 natural sciencesMolecular physicsCatalysisInorganic ChemistryIR and Raman spectroscopychemistry.chemical_compoundComputational chemistry0103 physical sciencesWavenumberMoleculePhysical and Theoretical Chemistrychemistry.chemical_classificationOriginal Paper010304 chemical physicsChemistryOrganic ChemistryLimitingEthylenes021001 nanoscience & nanotechnologyPolyeneComputer Science ApplicationsC = C bondComputational Theory and MathematicsQuantum TheoryDensity functional theoryAll-cis polyenes0210 nano-technologydescription
Detailed density functional theory (DFT) calculations on the structure and harmonic frequencies of model all-trans and all-cis polyenes were undertaken. For the first time, we report on the convergence of selected B3LYP/6-311++G** and BLYP/6-311++G** calculated structural parameters resulting from a systematic increase in polyene size (chains containing 2 to 14 C = C units). The limiting values of the structural parameters for very long chains were estimated using simple three-parameter empirical formulae. BLYP/6-311++G** calculated ν(C = C) and ν(C–C) frequencies for all-trans and all-cis polyenes containing up to 14 carbon–carbon double bonds were used to estimate these values for very long chains. Correction of raw, unscaled vibrational data was performed by comparing theoretical and experimental wavenumbers for polyenes chains containing 3 to 12 conjugated C = C units with both ends substituted by tert-butyl groups. The corrected ν(C = C) and ν(C–C) wavenumbers for all-trans molecules were used to estimate the presence of 9 – 12 C = C units in all-trans polyene pigment in red coral. Graphical abstract Detailed density functional theory (DFT) calculations on the structure and harmonic frequencies of model all-trans and all-cis polyenes were undertaken. For the first time, we report on the convergence of selected B3LYP/6-311++G** and BLYP/6-311++G** calculated structural parameters resulting from a systematic increase in polyene size (chains containing 2 to 14 C=C units). The limiting values of the structural parameters for very long chains were estimated using simple three-parameter empirical formulae. Electronic supplementary material The online version of this article (doi:10.1007/s00894-016-2969-1) contains supplementary material, which is available to authorized users.
year | journal | country | edition | language |
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2015-12-22 | Journal of Molecular Modeling |