Metal complexes with tetrapyrrole ligands: Part LXXVII . New osmium complexes of the 5,10,15,20-tetrakis-(4-carboxyphenyl) porphyrin

✍ Scribed by Johann W. Buchler; Joachim R. Simon

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 61 KB
• Volume: 05
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/jpp.352

✦ Synopsis

The synthesis and characterization of new alkali-soluble osmium tetraphenylporphyrinates, complexes of the 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin Os ( tH ~4~ cpp ) L ~2~ and Os ( tH ~4~ cpp ) LL ' (2a–j), is described. 2a–j are obtained from the corresponding new osmium porphyrinates Os ( tmecpp ) L ~2~ and Os ( tmecpp ) LL '(1a–k) by alkaline saponification and precipitation with hydrochloric acid. In fact, the osmium(II) porphyrinates 2c–f as well as 2i–j are oxidized to the osmium(III) porphyrinates Os ( tH ~3~ cpp ) L ~2~(3c–f) and Os ( tH ~3~ cpp ) LL '(3i–j) in the presence of air, as confirmed by UV-vis spectroscopy.