CRYSTAL-STRUCTURE AND MAGNETIC-SUSCEPTIBILITY OF DI-MU-CHLORO-BIS[CHLOROBIS(TETRAMETHYLENE SULFOXIDE)COPPER(II)], CU2CL4(C4H8SO)4 - ANTI-FERROMAGNETIC DIMER

Crystals of Cu2Cl4(C4H8SO)4 belong to the monoclinic space group P21/c (C2h5) with lattice constants [FORMULA OMMITED] room-temperature, single-crystal X-ray diffraction study was performed along with a study of the magnetic susceptibility from 4 up to 110 K. The structure was solved by direct methods and refined by full-matrix least-squares techniques to R(F0)=0.049 for 1544 unique reflections. The copper ion in each ;trans-CuCl2(C4H8SO)2 monomer has a significant tetrahedral distortion from planarity. Long Cu-Cl interactions between monomer units create discrete bibridged dimeric species. The copper-chlorine-copper bridging geometry is asymmetric with one long bond (3.020 Å) and one short bond (2.270 Å); the bridging angle is 88.5°. Magnetic susceptibility measurements over the temperature range 4-110 K show the salt is antiferromagnetically coupled (J/k=-12 K). Similarly, EPR measurements indicate weak interdimer interactions (J/k as 0.1 K) also exist. © 1979, American Chemical Society. All rights reserved.