Tris(2,2′-bipyridyl)dichlororuthenium(II) hexahydrate is a metal complex and is used as an luminescent dye. The metal complex in its ground state can be excited by visible light which leads to the formation of a spin-allowed excited state.
R 3945 (OTTOKEMI) Ruthenium-tris(2,2′-bipyridyl) dichloride, 98% Cas 50525-27-4 - used in the synthesis of hybrid catalysts which are used in oxidase based biosensors.