On the Calculation of Vibrational Frequencies for Molecules in Solution Beyond the Harmonic Approximation

被引:45
|
作者
Cappelli, Chiara [1 ]
Monti, Susanna [2 ]
Scalmani, Giovanni [3 ]
Barone, Vincenzo [4 ]
机构
[1] Univ Pisa, Dipartimento Chim & Chim Ind, I-56126 Pisa, Italy
[2] CNR, Ist Proc Chimicofis, I-56124 Pisa, Italy
[3] Gaussian Inc, Wallingford, CT 06492 USA
[4] Scuola Normale Super Pisa, I-56126 Pisa, Italy
关键词
POLARIZABLE CONTINUUM MODEL; ELECTRON CORRELATION; CIRCULAR-DICHROISM; AB-INITIO; SOLVATION MODELS; 2ND DERIVATIVES; IONIC-SOLUTIONS; LIQUID WATER; FREE-ENERGY; SPECTRA;
D O I
10.1021/ct100048g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report some results on the calculation of vibrational spectra of molecules in condensed phase with accounting simultaneously for anharmonicity and solute-solvent interactions, the latter being described by means of the polarizable continuum model (PCM). Density functional theory force fields are employed as well as a new implementation of the PCM cavity and its derivatives. The results obtained for formaldehyde and simple peptide prototypes show that our approach is able to yield a quantitative agreement with experiments for vacuo-to-solvent harmonic and anharmonic frequency shifts.
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页码:1660 / 1669
页数:10
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