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Organometallic complexes with biological molecules. I. Diorganotin(IV)chloro protoporphyrin IX complexes: Solid‐state and solution‐phase characterization
Author(s) -
Pellerito Lorenzo,
Pellerito Alessandro,
Maggio Francesco,
Beltramini Mariano,
Salvato Benedetto,
Ricchelli Fernanda
Publication year - 1993
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590070202
Subject(s) - chemistry , protoporphyrin ix , trigonal bipyramidal molecular geometry , carboxylate , crystallography , molecule , stereochemistry , monomer , crystal structure , polymer , organic chemistry , photodynamic therapy
Protoporphyrin IX (H 4 PPIX) complexes of diorganotin(IV)chloro moieties with formula (R 2 SnCl) 2 H 2 PPIX (RMe, Bu and Ph) have been obtained and their solid‐state and solution‐phase configurations have been studied through spectroscopic investigations. Coordination of the side‐chain carboxylates of H 4 PPIX to R 2 Sn(IV)Cl moieties, with bridging carboxylate (COO − ) has been inferred by comparison of the free and coordinated H 4 PPIX IR spectra, while the occurrence of a five‐coordinated tin(IV) atom in a cis ‐R 2 trigonal bipyramidal structure has been deduced, for all of the synthesized complexes, by rationalization of the nuclear quadrupole splitting parameters, according to the point‐charge model formalism. Fanally, the solution‐phase spectral features of (R 2 SnCl) 2 − H 2 PPIX are in agreement with the monomeric character of the protoporphyrin IX, under the experimental conditions used.