Binuclear platinum-terpyridine (tpy) complexes have been prepared with a variety of bridging ligands resulting in a range of metal-metal distances (2.998(2) to 3.342(3) A). The energy of an intense visible absorption is strongly dependent on this metal-metal separation and is assigned to a d sigma *(Pt2) yield pi*(tpy) transition.
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Bailey et al. (1993) studied this question.