Crystal structure of dichlorobis(2-amino-5-methyl-1,3,4-thiadiazole)dicopper(I)

An x-ray diffraction investigation of dichlorobis(2-amino-5-methyl-1,3,4-thiadiazole)dicopper(I) has been carried out. The crystals are monoclinic: a = 6.365(2), b = 9.353(3), c = 11.456(3) A, el = 100.51(3), space group P21/b, Z = 2. The intensities of 1620 reflections with I > 3sigma were measured on a Syntex P21 diffractometer (Mo K radiation). The structure was refined by the least-squares method to R = 0.055. The hydrogen atoms have been located. The molecule of the complex is a flat centrosymmetric dimer, in which the N atoms of the hydrazine residues are bridging atoms and join two Cu atoms to form a six-membered metallocycle. The environment of each Cu atom is a trigonal pyramid. In its base there are two atoms and a Cl atom, and at its apex there is a Cl atom from an adjacent complex. The Cu-N distances are equal to 1.194 and 2.025, the Cu-Cl distance is equal to 2.333, and the Cu-Cl/sub apic/ distance is equal to 2.699 A. The interatomic distances in the ligand are consistent with the literature data. The five-membered heterocycles deviate 10 from the plane of the metallocycle.