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Abstract. {[Cu2(C,2H~6N2OsS2)(H20)2].4H20}n,~=2.241mm -~, F(000)= 632, T= 294 K, final R = 0.036 for 1019 independent observed reflections. One N and two O atoms [from the same bis(carboxymethyl)amino moiety] and one O atom (from one water molecule) approximately define for each Cu the square base of a distorted octahedral environment which is achieved by longer trans axial bonds to one S atom (from a disulfide group) and to one O atom (from an adjacent ligand). Each ligand molecule chelates two Cu atoms and is also bonded via a bidendate carboxylate group to two others, thus forming layers linked to each other by water in a hydrogen-bonded network.

(2.4.6 trimethyl pyridine)2 Cu(CH3COO)2 has been obtained as violet needles by slow evaporation. The crystals belong to the monoclinic system, space group P21/C with two molecules in a unit cell of dimension: a = 7.842 (1), b = 16.384 (2), c = 8.320 (2) Å, β = 101.91 (1)°. The structure was solved by heavy atom method and refined by a least squares method (R = 0.029). The coordination of copper is 4 + 2. The atom arrangements of this structure is very near to the copper acetate one solvated by one water molecule and two 3.4 dimethyl pyridine molecules.