Photoluminescence of 2-(2'-hydroxy-5'-methylbenzoyl)-1,5-diphenylpyrrole in aqueous and β-cyclodextrin environments: manifestation of open and closed conformers

Purkayastha, Pradipta ; Chattopadhyay, Nitin (2001) Photoluminescence of 2-(2'-hydroxy-5'-methylbenzoyl)-1,5-diphenylpyrrole in aqueous and β-cyclodextrin environments: manifestation of open and closed conformers Journal of Molecular Structure, 570 (1-3). pp. 145-152. ISSN 0022-2860

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0022-2860(01)00484-7

Abstract

Steady-state fluorometric studies have been performed on 2-(2'-hydroxy-5'-methylbenzoyl)-1,5-diphenylpyrrole (HMBDPP) in aqueous and aqueous β-cyclodextrin (β-CD) environments at ambient temperature. The fluorophore mostly shows a single emission in aqueous solution. Addition of β-CD to the aqueous solution of the fluorophore results in the development of another emission band at higher energy. The difference in the fluorometric behaviour is assigned to a remarkable change in the polarity of the microenvironment within the supramolecular structural environment compared to that of the bulk aqueous phase. Semi-empirical calculation (AM1-SCI) rules out the possibility of intramolecular proton transfer reaction in any of the S0, S1 and T1 states of the fluorophore. It is proposed that HMBDPP exists mostly in the intermolecularly hydrogen-bonded form (open conformer) in aqueous solution while within β-CD environment, it is the intramolecularly hydrogen-bonded form (closed conformer) that predominates.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:β-cyclodextrin; Supramolecular Complex; Fluorescence; Closed Conformer; Open Conformer; Hydrogen Bond
ID Code:67444
Deposited On:31 Oct 2011 04:51
Last Modified:31 Oct 2011 04:51

Repository Staff Only: item control page