Synthesis of Ru- and Os-Complexes of π-Conjugated Oligomers of 2,2′-Bipyridine and 5,5′-Bipyrimidine. Optical Properties and Catalytic Activity for Photoevolution of H2 from Aqueous Media
- 1 May 1999
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 72 (5) , 1153-1162
- https://doi.org/10.1246/bcsj.72.1153
Abstract
Oligomers of 2,2′-bipyridine (Oligo-bpy) and 5,5′-bipyrimidine (Oligo-bpym) with a linear structure have been prepared by an organometallic C–C coupling reaction. The oligomeric chelating ligands have a molecular weight of about 1500 corresponding to about 10 chelating bpy or bpym units, and form soluble complexes with [M(bpy)2]2+ (M = Ru or Os). The UV-vis absorption spectra of the metal complexes of Oligo-bpy exhibit a π–π* transition band at 355 ± 6 nm and a peak at 453 ± 18 nm assigned to a MLCT absorption. The UV-vis spectra of the metal complexes of Oligo-bpym also show an absorption peak attributed to the MLCT band. The water-soluble Ru complex of Oligo-bpy catalyzes visible-light-induced H2 evolution from aqueous media in the presence of Pt cocatalyst and triethylamine.Keywords
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