Studies on the salts of planar metal dithiolate anions with the redox active 3,7-bis(dimethylamino)phenothiazin-5-ium cation (methylene blue)

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Abstract
The preparation of two series of 3,7-bis(dimethylamino)phenothiazin-5-ium (methylene blue, mb) salts with [M{S2C2(CN)2}2]2– and [M{S2C2(CN)2}2]–(M = Ni, Pd, Pt, or Cu) is described. Compressed pellets of all these compounds exhibit conductivities of less than 10–5Ω–1 cm–1 at room temperature. Single crystals of [mb][Pt{S2C2(CN)2}2] behave as semiconductors with an activation energy of 238 meV and a room-temperature conductivity of 10–5Ω–1 cm–1.