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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Phys+Chem+A
2015 ; 119
(49
): 11862-74
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Anharmonic Effects on Vibrational Spectra Intensities: Infrared, Raman,
Vibrational Circular Dichroism, and Raman Optical Activity
#MMPMID26580121
Bloino J
; Biczysko M
; Barone V
J Phys Chem A
2015[Dec]; 119
(49
): 11862-74
PMID26580121
show ga
The aim of this paper is 2-fold. First, we want to report the extension of our
virtual multifrequency spectrometer (VMS) to anharmonic intensities for Raman
optical activity (ROA) with the full inclusion of first- and second-order
resonances for both frequencies and intensities in the framework of the
generalized second-order vibrational perturbation theory (GVPT2) for all kinds of
vibrational spectroscopies. Then, from a more general point of view, we want to
present and validate the performance of VMS for the parallel analysis of
different vibrational spectra for medium-sized molecules (IR, Raman, VCD, ROA)
including both mechanical and electric/magnetic anharmonicity. For the well-known
methyloxirane benchmark, careful selection of density functional, basis set, and
resonance thresholds permitted us to reach qualitative and quantitative agreement
between experimental and computed band positions and shapes. Next, the whole
series of halogenated azetidinones is analyzed, showing that it is now possible
to interpret different spectra in terms of mass, electronegativity,
polarizability, and hindrance variation between closely related substituents,
chiral spectroscopies being particular effective in this connection.