Photochromic isomerization of dithiolene molybdenum complexes

Shibahara, Takashi; Ide, Yasuhiro; Shibata, Syoji; Sakane, Genta

Three photochromic complexes with disulfur and dithiolate ligands [Mo2(m-S2)(m-L)2(L)2] (3a, L = bis(4-methylphenyl)-ethylene-1,2-dithiolate (mpdt); 4a, L = bis(4-methoxylphenyl)-ethylene-1,2-dithiolate (mopdt); 5a, L = dibutyl-ethylene-1,2-dithiolate (budt)) have been synthesized and characterized by UV-visible and NMR (1H and 13C) spectroscopy and X-ray crystallog.  On exposure to a halogen lamp light, the colors of the complexes in solns. change very much, and, in the dark, the colors return to the original colors: 3a, purple to green; 4a, blue to green; 5a, red to red (a large spectral change).  Relevant mononuclear complexes [MoL3] (3c, L = mpdt; 4c, L = mopdt; 5c, L = budt) and nonphotochromic dinuclear complexes [Mo2(m-S2)2(m-S4)(L)4] (3b, L = mpdt; 4b, L = mopdt; 5b, L = budt) have also been synthesized and characterized.

Monograph Series of the International Conferences on Coordination Chemistry held periodically at Smolenice in Slovakia  (2003),  6(Progress in Coordination and Bioinorganic Chemistry)

Slovak Technical University Press

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