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Photoreduction of Fe(TPP)Cl in CH2Cl2 and DMSO in the presence of and in neat 1,2-dimethylimidazole without alcohol: evidence for a photoreactive state from resonance raman and optical absorption studies

✍ Scribed by P. K. Shantha; H. H. Thanga; A. L. Verma

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 228 KB
Volume: 29
Category: Article
ISSN: 0377-0486
DOI: 10.1002/(sici)1097-4555(199810/11)29:10/11<997::aid-jrs330>3.0.co;2-w

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✦ Synopsis

Coordination of 1,2-dimethylimidazole to chloroiron(III)tetraphenylporphyrin [ Fe(TPP)Cl ] in (1,2-Me 2 Im) DMSO and neat without alcohol results in clean reduction at the iron centre on photoexcita-CH 2 Cl 2 , 1,2-Me 2 Im tion at 441.6 nm. Fe(TPP)Cl also photoreduces in in the presence of 2-methylimidazole under anaerobic CH 2 Cl 2 conditions with 406.7 and 441.6 nm excitation. From detailed studies, it is inferred that a photoreactive state with absorption in the 315-335 nm range in the high-spin complexes of Fe(TPP)Cl formed with axial ligands is responsible for photoreduction.