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5,5'-Bi-SH-cyclopenta[Z, 1-b ;3,4-b']dipyridinylidene (1) was synthesized in three steps from 9,lO-phenanthroline and characterized by UVjVIS and NMR spectroscopy, mass spectrometry, and cyclic voltammetry. Its ability to act as a bridging ligand is demonstrated by the synthesis of the complexes [R~(bpy)~(l)](PF& (6) and [{ Ru(bpy)2)2(1)1(PF6)4 (7) (bpy = 2,2'-bipyridWIntroduction. -Polynuclear diimine-type complexes of Ru" and 0s" are at present under investigation with respect to their intramolecular energy-and electron-transfer properties [l]. These properties depend strongly on the nature of the bridging ligand. Here, we report the synthesis and the characterization of a new bridging ligand: 5,5'-Bi-SH-cyclopenta [2,l-b ;3,4-b']dipyridinylidene (1). The unusual electronic properties of 1, as well as the preparation of two Ru" complexes, are discussed. The compound 1 was first reported in 1979 [2]; however, our data do not correspond with those published.

The synthesis of the ligand 5-bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]amine-1,10-phenanthroline and of its ruthenium(II) and rhenium(I) complexes. Binuclear species with Cu(I) and some photophysical properties †

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