STRUCTURE AND MAGNETIC-PROPERTIES OF BIS(N,N-DIISOPROPYLDITHIOCARBAMATO)COPPER(II)

The complex bis(N,N-diisopropyldithiocarbamato)copper(II), C14H28CuN2S4, crystallizes in the space group P1 of the triclinic system with Z = 2. The unit cell has parameters a = 1 1.559 (3) Å, b = 11.692 (3) Å, c = 7.629 (2), Å, α = 96.35 (2)°, β = 96.35 (2)°, and γ = 88.78 (2)°. The final weighted R factor is 0.048 based on 1625 [intensity ≥ 2.5σ(I)] measured reflections. The two independent half-molecules in the unit cell are square planar with exactly planar CuS4 units and nearly planar >NCS2 moieties. The average of the four independent copper-sulfur distances is 2.283 Å, and the average of the four carbon-sulfur distances is 1.716 Å. The latter distance is indicative of considerable double-bond character. The shortest copper-copper intermolecular distance is 7.629 Å, and the shortest copper-sulfur intermolecular distance is 6.041 Å. There are significant intermolecular antiferromagnetic interactions transmitted over these long distances, as reflected by the reduction of the magnetic moment from about 1.8 μβ near 20 K to 1.5 μβ at 1.76 K. This observation provides additional documentation that sulfur bridges provide effective superexchange pathways for magnetic interactions between paramagnetic centers. © 1990, American Chemical Society. All rights reserved.