Oxygen quenching of metal-centered excited states of polypyridyl complexes of chromium(III)

✍ Scribed by Nick Serpone; Mary A Jamieson; Morthon Z Hofmann

• Book ID: 104137616
• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 269 KB
• Volume: 31
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)94958-2

✦ Synopsis

Oxygen quenching of the excited triplet states of organic molecules has been extensively investigated [l-41 ; in contrast, studies of the interactions between O2 and the excited states of inorganic complexes have only recently been reported [5-91. Two important mechanisms [lo] are used to account for the quenching of excited states: energy transfer (reaction l), and oxidative (reaction 2) or reductive (reaction 3) electron transfer. The metal-to-ligand-*M(NN)';+ t Q en. M(NN)';+ + *Q 0) oxid. *M(NN);+ t Q -M(NN)jn+r '+ t Q -(2) red *M(NN)$ t Q -M(NN)S"-"+ t Q' (3) charge-transfer (MLCT) excited states of *Ru(NN):+ and *Os(NN):' (NN = 2,2'-bipyridine, bpy; l,lOphenanthroline, phen, or their substituted derivatives) are apparently quenched by O2 via simple energy transfer to give '02 with very high efficiencies (0.