INFLUENCE OF THE ANION ON STABILIZATION AND COORDINATION OF CU(II) AND CU(I) COMPLEXES WITH BIS-[2-(4,6-DIMETHYLPYRIMIDYL)] DISULFIDE

Complexes of the type Cu(LSSL)X2 (X = Cl, Br) and Cu(LSSL)2X (X = ClO4, BF4) were prepared in CHCl3MeOH solution from CuX2 · 6 H2O (X = Cl, Br, ClO4, BF4) and bis‐[2‐(4, 6‐dimethylpyrimidyl)]disulphide (LSSL), and examined in the mid‐(4000–250 cm−1) and far‐i.r. (5000–60 cm−1) regions. Assignments for metal‐ligand and metalhalogen vibrations were made. On the basis of these assignments, conductivity measurements and from magnetic moments and visible absorption data, the stereochemistry of the compounds was tentatively inferred. For Cu(LSSL)X2 (X = Cl, Br) species may be proposed an essentially [CuN2X2] in‐plane microsymmetry achieved through two pyrimidyl nitrogen atoms of a ligand molecule, to form a seven‐membered chelate ring (Formula Presented.) and two halide ions, with probable interaction along the z axis with adjacent molecules. The Cu(LSSL)2X (X = ClO4, BF4) species, may be considered to contain isolated complexes cations, Cu(LSSL)  2+, or polynuclear cationic polymers, Cun(LSSL) 2nn+, in which Cu(I) is, probably via N3S, tetrahedraly coordinated. Copyright © 1979 Verlag GmbH & Co. KGaA, Weinheim