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Citation: LI Hui-Xue, WANG Xiao-Feng, DONG Xiao-Ning, YUAN Kun, ZHU Yuan-Cheng, XIAO Tai. Structures and Properties of Nicotinic Acid Dimer[J]. Acta Physico-Chimica Sinica, ;2009, 25(01): 161-168. doi: 10.3866/PKU.WHXB20090129 shu

Structures and Properties of Nicotinic Acid Dimer

1.
Biochemical College of Tianshui Normal University, Tianshui 741000, Gansu Province, P. R. China; College of Chemical & Engineering, Northwest Normal University, Lanzhou 730070, P. R. China

Received Date: 9 July 2008
Available Online: 3 November 2008

Nicotinic acid dimer was subjected to density functional theory calculations using B3LYP/6-311+G(d,p) basis set. Seven equilibrium isomers were located on the potential energy surface. The most stable structure isomer 1 has a strong N…H—O hydrogen-bonding interaction, and its calculated binding energy is -48.3 kJ·mol-1 corrected with basis set superposition error (BSSE).Anormal-mode analysis of the vibrations of the seven isomers was carried out. The charge transfer (CT) and their corresponding second-order interaction energies were studied by nature bond orbital (NBO) analysis. The solvent effects on the geometry of the stablest equilibrium isomer 1 were systematically studied by self-consistent reaction field polarized continuum model (PCM) technique with different dielectric constants of 1.0 (vacuum), 2.247(benzene), 10.36(dichloroethane), 20.7(acetone), 32.63(methanol), and 78.39(water). It was found that the solvent effect would significantly enhance the strength of hydrogen bond as shown by the decrease of the N…H distance. The solvent effect is obvious when ε is in 1.0-32.63 and is weak when ε exceeds 32.63.
- Density functional theory; Nicotinic acid dimer; Basis set superposition error; Polarized continuummodel
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