Journal of Molecular Structure, ( ISI ), Volume (1099), No (1), Year (2015-7) , Pages (340-347)

Title : ( Vibrational spectra of tris(acetylacetonato)chromium(III) )

Authors: Fatemeh Dolati , Mohamad Vakili , Ali Ebrahimi , Sayyed Faramarz Tayyari ,

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Abstract

The molecular structure and vibrational spectra of tris(acetylacetonato)chromium(III), Cr (AA)3, its mono-deuterated, Cr (DAA)3, and per-deuterated analogous, Cr(D7AA)3, were investigated using density functional theory (DFT) calculations. The geometry of the titled compound was fully optimized at the B3LYP level using 6-311 þ G* and 6-31G** basis sets. The harmonic vibrational frequencies were obtained at the B3LYP/6-311 þ G** level. Raman scattering activities were calculated at the 3LYP/6-31G** level. The calculated frequencies are compared with the experimental IR and Raman spectra. All of the measured IR and Raman bands were interpreted in terms of the calculated vibrational modes and isotopic frequency shifts. The scaled theoretical frequencies and the structural parameters are in excellent agreement with the experimental data. Analysis of the vibrational spectra indicates a strong coupling between the chelated ring modes. Several bands at 933, 680, 611, 594, 495, 250, 224, and 179 cm-1 are found to be engaged in CreO vibrational movements. The IR bands at 611 and 594 cm-1 are attributed to the asymmetric CreO stretching and the very strong Raman band at 460 cm-1 is assigned to the totally symmetric CreO stretching mode (a1 species).

Keywords

Tris(acetylacetonato)chromium(III); Vibrational spectroscopy; Density functional theory; Isotopic frequency shifts Deuterated tris(acetylacetonato) chromium(III)
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@article{paperid:1048564,
author = {Dolati, Fatemeh and Vakili, Mohamad and Ali Ebrahimi and Tayyari, Sayyed Faramarz},
title = {Vibrational spectra of tris(acetylacetonato)chromium(III)},
journal = {Journal of Molecular Structure},
year = {2015},
volume = {1099},
number = {1},
month = {July},
issn = {0022-2860},
pages = {340--347},
numpages = {7},
keywords = {Tris(acetylacetonato)chromium(III); Vibrational spectroscopy; Density functional theory; Isotopic frequency shifts Deuterated tris(acetylacetonato) chromium(III)},
}

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%0 Journal Article
%T Vibrational spectra of tris(acetylacetonato)chromium(III)
%A Dolati, Fatemeh
%A Vakili, Mohamad
%A Ali Ebrahimi
%A Tayyari, Sayyed Faramarz
%J Journal of Molecular Structure
%@ 0022-2860
%D 2015

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