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Ionically bound metalloporphyrin pairs on solid polymer support

MIKKI V. VINODU

School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686 560, India

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and

M. PADMANABHAN

School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686 560, India

Corresponding author, School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686 560 India.

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https://doi.org/10.1002/jpp.543Cited by:7 (Source: Crossref)

Abstract

The present work demonstrates a simple and elegant strategy by which synthetically simple porphyrins are grafted on solid polymer support to generate porphyrin pairs held together by strong coulombic forces. Metalloporphyrins of tetra(4-pyridyl)porphyrins (MTPyP) were reacted with chloromethylated polystyrene (PS) beads to get covalently bound monocationic porphyrins on the polymer support (PS–MTPyP⁺). These were then converted to their tetracationic species (PS–MTMe₃PyP⁴⁺) by exhaustive quaternisation, using CH₃I. These polymer-grafted cationic porphyrins were made to react with tetraanionic p-sulphonated phenylporphyrins (MTPPS^4-) in aqueous conditions. Analysis showed that the PS–MTMe₃PyP⁴⁺ take up MTPPS^4- in exactly 1:1 stoichiometry to form strongly bound (ionically) porphyrin pairs. A variety of homo- and hetero-porphyrin pairs involving central metal ions like Mn, Co, Cu, Zn and Ag and also free-base porphyrins are generated by this strategy.

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