6- -2,2 -bipyridine cyclometalated palladium

To examine the relationship between the low-energy luminescence and intramolecular metal-metal distances, a series of [Pt2(CANAN)2(/U-L)]n+ (HCANAN=4-(aryl)-6-phenyl-2,2 -bipyridine) derivatives supported by different bridging ligands (L) have been prepared by Che and coworkers [17]. Subsequent spectroscopic assignments of cyclometalated platinum(II) or palladium(II) derivatives were made by comparing their emission energies with those of the [Pt2(CANAN)2(//-L)]n+ complexes. 

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