Intermolecular complexes of singly linked bisporphyrins with trinitrobenzene

Jeyakumar, D and Krishnan, V (1992) Intermolecular complexes of singly linked bisporphyrins with trinitrobenzene. In: Spectrochimica Acta Part A: Molecular Spectroscopy, 48 (11-12). pp. 1671-1682.

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Abstract

Several covalently linked bisporphyrin systems, free-base (H2P---H2P), hybrid bisporphyrins (Zn---H2P) and Zn(II) dimers (ZnP---ZnP) and their 1:1 molecular complexes with sym 1,3,5-trinitrobenzene have been investigated by optical absorption and emission, and magnetic resonance spectroscopic methods. In these systems, two porphyrin units are linked singly through one of the meso aryl groups via ether linkages of variable length. The bisporphyrins cooperatively bind a molecule of a ?-acceptor; 1,3,5-trinitrobenzene (TNB). The binding constant values vary with interchromophore separation. Maximum binding is observed in the bisporphyrin bearing a two-ether covalent linkage. It is found that TNB quenches the fluorescence of the two porphyrine units in a selective manner. It is suggested that a critical distance between the two porphyrin units is necessary for the observance of maximum cooperative intermolecular binding with an acceptor.

Item Type:	Journal Article
Publication:	Spectrochimica Acta Part A: Molecular Spectroscopy
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	05 May 2011 07:20
Last Modified:	05 May 2011 07:20
URI:	http://eprints.iisc.ac.in/id/eprint/37060

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