11) Kopelman, R. A.; Snyder, S. M.; Frank*, N. L. Tunable Photochromism of Spirooxazines via Metal Complexation J. Am. Chem. Soc. 2003 125, 13684-13685 (NOV 12 2003) DOI: 10.1021/ja036306y.
The ability to optically gate transition metal properties such as oxidation state, redox potential, and excited state energies is a powerful approach to photoresponsive materials design. Photochromic spirooxazine-phenanthroline ligands are coordinated to a series of first row transition metals as a model for ligand field switching of transition metal properties. Unlike other classes of photochromes, metal complexation leads to an increase in photorepsonsivity of the photochrome. Metal-dependent changes in the photoresponsivity and thermal equilibria are observed, attributable to changes in lewis acidic character and oxidation state of the metal center.