SYNTHESIS AND SPECTROSCOPIC STUDIES OF MANGANESE PORPHYRIN-THIOLATE COMPLEXES

The synthesis and spectroscopic characterization of four manganese(III ) porphyrin thiolates are reported. The investigated compounds are rep resented by (TPP)Mn(SR), where TPP is the dianion of tetraphenylporhyr in and R is C6H5, C6H4(p-NO2), Et2NCS and C4H8NCS. Each complex was ch aracterized by UV-vis and H-1 NMR spectroscopy. The effects of axial l igands on the UV-vis spectra of synthesized manganese porphyrin comple xes is discussed and proton isotropic shifts are shown to be predomina ntly contact in origin, reflecting extensive porphyrin-to-metal pi bon ding. (C) 1997 Elsevier Science Ltd.