Journal of Molecular Structure, ( ISI ), Volume (889), Year (2008-6) , Pages (165-176)

Title : ( Hydrogen bond strength and vibrational assignment of the enolform of 3-(phenylthio)pentane-2,4-dione )

Authors: Robert Eric Sammelson , atefeh najafi , - - , , Sayyed Faramarz Tayyari ,

Access to full-text not allowed by authors

Citation: BibTeX | EndNote

Abstract

The molecular structure of 3-(phenylthio)pentane-2,4-dione (PTPD) has been investigated by means of Density Functional Theory (DFT) calculations and the results were compared with those of the unsubstituted parent, pentane-2,4-dione (known as acetylacetone,AA). The harmonic vibrational frequencies of the cis-enol form were calculated at the B3LYP level using 6-31G** and 6-311G** basis sets. The calculated frequencies and the Raman and IR intensities were compared with the experimental results. The infrared and Raman spectra of PTPD and its deuterated analogue are recorded in the 4000–100 cm1 range. The observed vibrational wave numbers were analyzed in light of the computed vibrational spectra. According to the theoretical calculations, the hydrogen bond strength for PTPD is 6.1–6.8 kJ/mol stronger than in AA. This result is in agreement with the OH/OD stretching, OH/OD in-plane bending, O...O stretching frequencies, and NMR chemical shift data. Natural Bond Orbital (NBO) analyses indicate that both steric and resonance effects are responsible for increasing the hydrogen bond strength in PTPD.

Keywords

, Vibrational spectra; 3-(Phenylthio)pentane-2, 4-dione; NBO; Intramolecular hydrogen bond
برای دانلود از شناسه و رمز عبور پرتال پویا استفاده کنید.

@article{paperid:1007959,
author = {Robert Eric Sammelson and Najafi, Atefeh and -, - and , and Tayyari, Sayyed Faramarz},
title = {Hydrogen bond strength and vibrational assignment of the enolform of 3-(phenylthio)pentane-2,4-dione},
journal = {Journal of Molecular Structure},
year = {2008},
volume = {889},
month = {June},
issn = {0022-2860},
pages = {165--176},
numpages = {11},
keywords = {Vibrational spectra; 3-(Phenylthio)pentane-2;4-dione; NBO; Intramolecular hydrogen bond},
}

[Download]

%0 Journal Article
%T Hydrogen bond strength and vibrational assignment of the enolform of 3-(phenylthio)pentane-2,4-dione
%A Robert Eric Sammelson
%A Najafi, Atefeh
%A -, -
%A ,
%A Tayyari, Sayyed Faramarz
%J Journal of Molecular Structure
%@ 0022-2860
%D 2008

[Download]