Thermochromic triangular [MCo2] (M = Rh, Ir, Ru) clusters containing a planar metalladithiolene ring in eta3 coordination.

The first series of triangular cluster complexes of [MCo(2)] (M = Rh, Ir, Ru) with a planar metalladithiolene ring coordinating in the eta(3)-bonding mode were synthesized, and the crystal structures, spectral and electrochemical properties, and thermochromism of these complexes were revealed.