Comprehensive evaluation of medium and long range correlated density functionals in TD-DFT investigation of DNA bases and base pairs: gas phase and water solution study

作者: Manoj K. Shukla , Jerzy Leszczynski

DOI: 10.1080/00268976.2010.496741

关键词: Valence (chemistry)Basis setPotential energyChemistryGround stateNucleobaseAtomic physicsSinglet stateTime-dependent density functional theoryMolecular physicsSolvation

摘要: A comprehensive analysis of the performance TD-DFT method using different density functionals including recently developed medium and long-range correlation corrected have been carried out for lower-lying electronic singlet valence transitions nucleic acid bases Watson–Crick base pairs in gas phase water solution. The standard 6-311++G(d,p) basis set was used. Ground state geometries were optimized at M05-2X/6-311++G(d,p) level. nature potential energy surfaces (PES) ascertained through harmonic vibrational frequency analysis; all found to be minima respective PES. Electronic vertical transition energies also computed CC2/def2-TZVP level phase. effect state-specific solvation on considered PCM model. For isolated B3LYP functional generally superior...

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