Ru(bpy)2(ppz)2+ (ppz-4'7'-phenathrolino-5'6':5,6-pyrazine) is one of a group of compounds that exhibit enhanced Bronsted basicity upon excitation with visible light. Current research focuses on the ground and excited state metal coordination of the complex with Zn (II) and Cd (II). UV-Vis and emission titration data along with excited-state lifetime date will be presented. Reactions of Zn (II) and Cd (II) with Ru(bpy)2(ppz)2+ show a tenfold increase in ground state equilibrium contants, in comparison with Ru(bpy)2(dpp)2+ Reaction with Zn (II) shows sustained new emission at 785 nm with a lifetime of 60 ns at high Zn (II) concentration, which is attributed to the formation of an exciplex as the Zn2+ coordinates to the peripheral ppz nitrogens of Ru(bpy)2(ppz)2+ Comparisons of the results with different Ru (II) diimines indicate the importance of structural factors in both ground and excited-state coordination.

Ground and excited-state coordination of Ru(bpy)<sub>2</sub>(ppz)<sup>2+</sup> (ppz-4'7'-phenathrolino-5'6':5,6-pyrazine)

240th National Meeting (2010)

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Ground and excited-state coordination of Ru(bpy)2(ppz)2+ (ppz-4'7'-phenathrolino-5'6':5,6-pyrazine)

Ground and excited-state coordination of Ru(bpy)₂(ppz)²⁺ (ppz-4'7'-phenathrolino-5'6':5,6-pyrazine)