Intermolecular complexes of singly linked bisporphyrins with trinitrobenzene

Jeyakumar, D. ; Krishnan, V. (1992) Intermolecular complexes of singly linked bisporphyrins with trinitrobenzene Spectrochimica Acta Part A: Molecular Spectroscopy, 48 (11-12). pp. 1671-1682. ISSN 0584-8539

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/058485...

Related URL: http://dx.doi.org/10.1016/0584-8539(92)80240-W

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 π-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.

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