This present invention provides a metal-ligand complex and methods for using and preparing the same. In particular, the metal-ligand complex of the present invention is of the formula: L.sub.a-M-X.sub.b where L, M, X, a, and b are those define herein. The metal-ligand complexes of the present invention are useful in a variety of applications including as electron-transfer mediators in dye-sensitized solar cells and related photoelectrochromic devices.
STATEMENT REGARDING FEDERALLY FUNDED RESEARCH
The U.S. Government has paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Grant No. DE-FG03-97ER14808 awarded by the U.S. Department of Energy, and Grant Nos. CHE-0139637 and CHE-9714081 awarded by the National Science Foundation.