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Bisporphyrins; brominated porphyrins; electrochemical redox; fluorescence studies

A series of covalently linked bisporphyrins bearingmeso-tetraphenylporphyrin (TPP) and octabromotetraphenylporphyrin (OBTPP) units have been synthesised and characterised. Electrochemical studies on these bisporphyrins showed an anodic shift (∼ 30–60 mV) of the TPP unit and a cathodic shift (∼40-80 mV) of OBTPP in redox potentials. Further, steady-state fluorescence studies on bisporphyrins indicated dramatic decrease in fluorescence quantum yields of the TPP moiety. Electrochemical redox and fluorescence data seem to suggest the possible existence of intramolecular interactions in these bisporphyrins

Puttaiah Bhyrappa¹ V Krishnan²

1. Department of Chemistry, Indian Institute of Technology-Madras, Chennai - 600 036, India
2. Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore - 560 012, India

Published

March 2004

Manuscript received

20 October 2003

Manuscript revised

1 March 2004