Enantio­tropic phase transition in a binuclear tin complex with an O,N,O'-tridentate ligand

A dinuclear tin(IV) complex of 2-[(2-oxido­benzyl­idene)amino]­ethanolate is disordered above 178 K. The crystal structure at 93 K contains two ordered mol­ecules. The phase transition corresponds to an order-disorder transition of a vinyl group bound to the Sn^IV atom.