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Synthesis and Characterization of Carboxylate Complexes of Sn IV Porphyrin Monomers and Oligomers
Author(s) -
Hawley Joanne C.,
Bampos Nick,
Sanders Jeremy K. M.
Publication year - 2003
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200304862
Subject(s) - porphyrin , carboxylate , chemistry , dimer , monomer , ligand (biochemistry) , metal , stereochemistry , crystallography , photochemistry , polymer , organic chemistry , biochemistry , receptor
Most of the porphyrin‐recognition chemistry we have investigated previously has centred on kinetically labile metal–ligand interactions, such as ZnN and RuN. Our interest in the broader scope of molecular recognition required a metal with the ability to specifically recognise non‐nitrogen‐based ligands, with a significantly different binding interaction to distinguish it from nitrogen‐based analogues. In this report we describe interactions of Sn IV porphyrins that bind oxygen‐based ligands and for which the Sn IV O bond is in slow exchange on the NMR timescale. A series of carboxylate complexes is employed to highlight the structural/geometric features of porphyrin monomers and cyclic oligomers. Where more than one porphyrin unit is present in a molecular scaffold, we report the effect of carboxylate binding on the complex when the two porphyrins contain different metals (typically Sn IV and Zn II ). The unexpected spectroscopic and structural properties of the Sn 2 (9‐anthroic acid)porphyrin dimer are also reported.