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Multiporphyrin coordination arrays based on complexation of magnesium(II) porphyrins with porphyrinylphosphine oxides

Atefi, Farzad, McMurtrie, John C., & Arnold, Dennis P. (2007) Multiporphyrin coordination arrays based on complexation of magnesium(II) porphyrins with porphyrinylphosphine oxides. Dalton Transactions, pp. 2163-2170.

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Abstract

Di- and triporphyrin arrays consisting of 5,15-diphenylporphyrinatomagnesium(II) (MgDPP) coordinated to free-base and Ni(II) porphyrinyl mono- and bis-phosphine oxides, as well as the self-coordinating diphenyl[10,20-diphenylporphyrinatomagnesium(II)-5-yl]phosphine oxide [MgDPP(Ph2PO)], were synthesised in excellent yields and characterised by various spectroscopic techniques. Phosphine oxides stabilise Mg(II) coordination to porphyrins and the resulting complexes have convenient solubilities, while the Ni(II) complexes exhibit interesting intramolecular fluorescence quenching behaviour. The binding constant of MgDPP to triphenylphosphine oxide (5.3 ± 0.1 × 105 M-1) and the very high self-association constant of [MgDPP(Ph2PO)] (5.5 ± 0.5 × 108 M-1) demonstrate the strong affinity of phosphine oxides towards Mg(II) porphyrins. These complexes are the first strongly bound synthetic Mg(II) multiporphyrin complexes and could potentially mimic the "special pair" in the photosynthetic reaction centre.

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13 citations in Web of Science®

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ID Code: 13260
Item Type: Journal Article
Keywords: porphyrin, magnesium, supramolecular, phosphine oxide
DOI: 10.1039/b703589f
ISSN: 1477-9226
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Nanochemistry and Supramolecular Chemistry (030302)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2007 Royal Society of Chemistry
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 08 Apr 2008
Last Modified: 29 Feb 2012 23:39

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