کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1308925 975188 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laser flash photolysis studies of tris(2,2′-bipyridine)nickel(II) ion in aqueous solution
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Laser flash photolysis studies of tris(2,2′-bipyridine)nickel(II) ion in aqueous solution
چکیده انگلیسی

The photoreactions of tris(2,2′-bipyridine)nickel(II) complex, Ni(II)(bpy3)2+ were studied and compared with that of the photoreactions of 2,2′-bipyridine ligand. Continuous photolysis of the complex shows that the photodecomposition corresponds to the absorption of light by the complex in the ligand centered excited state. Flash photolysis of the complex using a 248 nm excimer laser yields bipyridine cation radical and solvated electron as transients. Absorption spectra of the transient observed for the complex is found to be similar to that observed for the ligand on flash excitation using a 248 nm laser suggesting that the transients observed in the case of complex is due to the coordinated bipyridine in the complex. The formation of solvated electron is observed to be monophotonic and that of the bipyridine cation radical is found to be a biphotonic process. Significant change in Ni–N bond distance upon oxidation of Ni(bpy3)2+ ion when compared to that observed in nickel(II)tetraazamacrocyclic complexes suggests that the formation of the trivalent complex by photolysis is not favored for the Ni(bpy3)2+ ion and CTTS excited state in the complex is not observed in the present system.

Flash photolysis of Ni(bpy)32+ ion is investigated by continuous photolysis and flash photolysis which indicates photoionisation of bipyridine ligand in the complex. Photoionisation proceeds by mono and biphotonic processes.Figure optionsDownload as PowerPoint slideHighlights
► Absorption of light by the Ni(bpy3)2+ ion leads to is ligand centered excitation of the complex.
► Results in oxidation of coordinated bipyridine.
► Solvated electron and bipyridine cation radical are the transients observed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 372, Issue 1, 15 June 2011, Pages 429–435
نویسندگان
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