Tridentate-bridged polyazine complexes of ruthenium(II) and osmium(II) andtheir application to the development of photochemical molecular devices

The application of polymetallic complexes to photochemical energy conversio n is an active area of research. The use of tridentate complexes within thi s context has been less well explored than the highly studied tris-bidentat e structural motif. Recent interest has expanded to explore the class of tr identate bridged complexes that incorporate Run and Os-II chromophores. The se systems hold promise in that they give rise to polymetallic systems that are stereochemically defined. This is important in the construction of mol ecular devices that utilize energy or electron transfer as it will allow co ntrol of donor - acceptor distance and orientation. This article describes some of the recent research in the construction and study of polyazine-base d, tridentate-bridged complexes containing Ru-II and Os-II chromophores.