Pulse and steady-state radiolysis studies of some homonuclear copper(II) and heteronuclear copper(II)-molybdenum(VI) peroxo compounds containing a simple peptide molecule
✍ Scribed by S. Kapoor; M. S. Sastry
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 190 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
The reactions of and radicals with some novel homo nuclear Ϫ Ϫ e , OH•, CO •, N • aq 2 3 and hetero nuclear peroxo peptide complexes viz: copper peroxo glycylglycine, [Cu(O 2 )(H 2 L) 2 ]; molybdenum oxoperoxo glycylglycine, [Mo(O)(O 2 ) 2 (H 2 L) 2 ]; Cu,Mo oxoperoxo glycylglycine [CuMo(O)(O 2 )(L) 2 ] and Cu,Mo, oxo glycylglycine, [CuMo(O) 2 (L) 2 ] in (H L ϭ glycyl glycine) 2 aqueous solutions were investigated by pulse radiolysis. Three types of reactions were observed: (1) reduction of Cu(II) to Cu(I) by and (2) oxidation of Cu(II) to Cu(III) by Ϫ Ϫ e C O •, aq 2 and (3) formation of a radical on H abstraction from the ligand by radical. Rate Ϫ N •, OH• 3 constants were reported for formation and decomposition of all intermediates. In case of one electron reduced complexes of hetero atoms, CuMo(O) 2 L 2 and CuMo(O)(O 2 )L 2 , prepared via the reduction of the corresponding complexes by formation of a new dimer radical anion Ϫ e , aq complex was observed. It is also noteworthy to mention the possibility of the effect of peroxo ligand on intermediate steps during the formation of Cu clusters.