Syntheses and crystal structures of copper(I) complexes with alkyl-thioallophanate derivatives

The reaction of CuCl2·2H2O with N-(p-nitrophenyl)-N′-butoxycarbonyl)-thiourea (H2nbt) and N-(o-nitrophenyl)-N′-(ethoxycarbonyl)-thiourea (H2net) gave two copper(I) complexes, [Cu(H2nbt)2Cl]2, 1, and Cu(H2net)2Cl, 2, respectively. In complex 1, the ligand H2nbt is S,S-bonded to two Cu atoms, and the two ligand molecules exchange “long” CuS interactions ( Cu  S = 2.700 A ) forming a dimer, in which the Cu atom has a distorted tetrahedral coordination ClCuS(1) = 119.9(1),ClCuS(2) = 122.9(1) and S(1)CuS(2) = 108.4(1)° and is 0.387(2) A from th basal S,S,Cl with unequal Cu  S [2.253(3), 2.244(3) A ] and Cu  Cl [2.247(3) A ] bonds. In complex 2, the copper (I) atom is inn a trigonal planar geometry [ClCuS(1) = 120.53(5), ClCuS(2) = 118.43(5) and S(1)CuS(2) = 119.16(5)°] with two unequal Cu  S [2.228(1), 2.232(1) A ] and Cu  Cl [2.251(1) A ] bonds.