On Two Solvate Crystals of Di‐μ‐sulfido(‐dithiocarbamate)‐tin(IV): [Sn(S 2 CNH 2 ) 2 S] 2 ·2H 2 O·EtOH and [Sn(S 2 CNH 2 ) 2 S] 2 ·4EtOH

[Sn(S 2 CNH 2 ) 2 S] 2 · 2H 2 O · EtOH ( A ) was prepared via oxidation of Sn 2+ with thiuram sulfide in aqueous alcohol solution. The compound [Sn(S 2 CNH 2 ) 2 S] 2 · 4EtOH ( B ) crystallizes from a saturated alcoholic solution of A . The monoclinic unit cell of A , space group P 2 1 / n (No. 14), a = 12.9169(9), b = 9.7222(5), c = 19.504(12) Å and β = 99.802(8) °, contains four formula units. B crystallizes in the orthorhombic space group Fddd (No. 70), a = 12.9500(4), b = 13.7737(4), c = 34.6012(12) Å with Z = 8 formula units per unit cell. The crystal structures consist of dinuclear Sn(S 2 CNH 2 ) 2 units doubly bridged by two sulfide (S 2– ) anions forming a centrosymmetric Sn 2 S 2 square. These units are interlaced by primarily strong hydrogen bonds originating from the solvate molecules and the amino groups (O–H ··· S, N–H ··· O and N–H ··· S for A and N–H ··· O and O–H ··· S for B ). The two solvate crystals can be interconverted via their alcoholic solution. B recrystallizes after saturation and A precipitates if a suitable portion of water is added.