BIS(THIOUREA)CADMIUM HALIDES

The crystals of dichlorobis(thiourea-S)cadmium, [CdCl2{SC(NH2)(2)}(2)] , (I), and dibromobis(thiourea-S)cadmium, [CdBr2{SC(NH2)(2)}(2)], (II) , are orthorhombic (Pmn2(1) and Pnam, respectively), while those of di iodobis(thiourea-S)cadmium, [CdI2{SC(NH2)(2)}(2)], (III), are monoclin ic (P2(1)/c). In all these compounds, two S atoms from two thiourea mo lecules and two X (X = halogen) atoms coordinate to Cd in tetrahedral arrangements. Crystal packing is mainly determined by N-H ... X hydrog en bonds, but is different in all three cases. The average Cd-X distan ce increases from 2.541 (1) Angstrom in (I) to 2.655(3)Angstrom in (II ) and 2.782(1) Angstrom in (III), whereas the average Cd-S distances i n the three compounds are quite similar, their values being 2.517(1), 2.522(2) and 2.526 (2) Angstrom, for (I), (II) and (III), respectively .