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A TD-DFT study on the cyanide-chemosensing mechanism of 8-formyl-7-hydroxycoumarin.

06:00 EDT 17th September 2010 | BioPortfolio

Summary of "A TD-DFT study on the cyanide-chemosensing mechanism of 8-formyl-7-hydroxycoumarin."

Proton transfer (PT) and excited-state PT process are proposed to account for the fluorescent sensing mechanism of a cyanide chemosensor, 8-formyl-7-hydroxycoumarin. The time-dependent density functional theory method has been applied to investigate the ground and the first singlet excited electronic states of this chemosensor as well as its nucleophilic addition product with cyanide, with a view to monitoring their geometries and spectrophotometrical properties. The present theoretical study indicates that phenol proton of the chemosensor transfers to the formyl group along the intramolecular hydrogen bond in the first singlet excited state. Correspondingly, the nucleophilic addition product undergoes a PT process in the ground state, and shows a similar structure in the first singlet excited state. This could explain the observed strong fluorescence upon the addition of the cyanide anion in the relevant fluorescent sensing mechanism. © 2010 Wiley Periodicals, Inc. J Comput Chem, 2010.

Affiliation

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China.

Journal Details

This article was published in the following journal.

Name: Journal of computational chemistry
ISSN: 1096-987X
Pages:

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