Polypyridine complex

Polypyridines are multidentate ligands that confer characteristic properties to the metal complexes that they form.

Some complexes strongly absorb light via a process called metal-to-ligand charge transfer (MLCT).

[2] A well-known example of a polypyridine complex is the tris(bipyridine) derivative of ruthenium(II), [Ru(bpy)3]2+.

This complex exhibits intense luminescence at room temperature in aqueous solution.

This complex also exhibits photoluminescence at room temperature, and its wavelength and lifetime can be tuned by substitution of either bipyridine or dithiolate moieties.