alexa Conformational Preferences of 2-Acylpyrroles in Light o
ISSN: 2161-0398

Journal of Physical Chemistry & Biophysics
Open Access

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Review Article

Conformational Preferences of 2-Acylpyrroles in Light of FT-IR and DFT Studies

Alina T Dubis*
Institute of Chemistry, University of Białystok, Hurtowa 1, 15-399 Białystok, Poland
Corresponding Author : Alina T Dubis
Deputy Director
Institute of Chemistry
University Of Białystok
Institute of Chemistry
Al. Piłsudskiego 11/4
Białystok, 15-443, Poland
Tel: +48600447773
E-mail: [email protected]
Received July 15, 2014; Accepted August 11, 2014; Published August 13, 2014
Citation: Dubis AT (2014) Conformational Preferences of 2-Acylpyrroles in Light of FT-IR and DFT Studies. J Phys Chem Biophys 4:155. doi:10.4172/2161-0398.1000155
Copyright: © 2014 Dubis AT. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

Conformations of alpha-substituted pyrroles have been effectively studied using spectroscopic methods assisted by theoretical calculations developed in the recent decade. The question of how to effectively study the conformation of 2-acylpyrrole no longer remains unanswered. The detailed spectroscopic studies conducted in the last decade and interpreted on the basis of theoretical calculations provide a satisfactory answer to that question. Based on the Density Functional Theory (DFT) calculations of conformational properties of 2-acylpyrroles, for which two stable rotameric forms were predicted, syn and anti-conformers have been studied either by experimental or theoretical methods. The family of 2-acylpyrroles have both a proton donor N-H group and a proton acceptor C=O group. This structure favors the formation of doubly hydrogen-bonded cyclic dimers connected by two N-H...O=C bonds. The tendency to form cyclic dimers stabilizes the syn-conformation. Due to these properties 2-acylpyrroles can be used as structural models for the conformational analysis of peptides.
This review summarizes recent investigations of conformations of 2-acylpyrroles, with a particular emphasis on the hydrogen bonds forming within these systems. The influence of 2-substitution on different aspects of stability of these molecular systems and the usefulness of infrared spectroscopy supported by theoretical calculations in H-bonds and conformational studies are discussed. Among the molecular properties hydrogen bond energy, structural characteristics such as C=O bond length of dimers and unique spectral features of 2-acylpyrroles that can be used to predict and investigate the conformation and structure of proteins are considered.

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