Photochemistry of metalloporphyrins in aqueous solutions

✍ Scribed by Zeinab M. Abou-Gamra; Nabila M. Guindy

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 367 KB
• Volume: 45
• Category: Article
• ISSN: 1386-1425
• DOI: 10.1016/0584-8539(89)80232-6

✦ Synopsis

The fluorescence spectra of Ga(III), In(N), Ge(IV) and Sn(IV) tetramethyl pyridine porphyrin showed a small stokes shift co 400+ 100 cm-i attributed to the similarity between their ground and excited states. The one and two electron reduction products of the me~lloporphyrins were studied by steady-state method. The nature of the product was dependent upon the pH of the reaction medium. Chlorin and phlorin were obtained at low and high pH's, respectively. Sn TMPyP was the only metalloporphyrin which yielded the II-radical anion whose stability is due to the high electronegativity of Sn(IV). INTRODU~ION

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