ELECTRON-MICROSCOPY AND MAGNETIC-PROPERTIES OF TETRA(N-BUTYL) AMMONIUM-SALTS OF [NI(DMBIT)(2)](1-) AND [NI(DMBBIP)(2)](1-) )C7H2S5-2-THIOBENZO[D]-1,3-DITHIOLE-5,6-DITHIOLATE 16S4-1,2-BIS(ISOPROPYLTHIO)BENZENE-4,5-DITHIOLATE)

Monoanionic nickel(III) complexes, [Ni(dmbit)(2)](1-) and [Ni(dmbbip)( 2)](1-) where dmbit(2-) and dmbbip(2-) denote 2-thiobenzo[d]-1,3-dithi ole-5,6-dithiolate and 1,2-bis(isopropylthio)benzen-4,5-dithiolate, re spectively, have been synthesized by the iodine oxidation of dianionic complexes. In the scanning electron microscopic (SEM) images, these c omplexes show the well-grown two-dimensional layered structures which are clearly comparable to the dianionic ones with three-dimensional st ructures. Magnetic susceptibilities of nickel(III) complexes are fitte d well with the two-dimensional Heisenberg antiferromagnet model of S= 1/2 system resulting in the spin-exchange parameters (\J\/k) of 11.4 K and 0.45 K, respectively. The weaker magnetic interaction in [Ni(dmbb ip)(2)](1-) is resulted from the bulky isopropyl groups on the periphe ry of dmbbip ligand. EPR measurements for [Ni(dmbit)(2)](1-) give the signal with axial symmetry and the anisotropic g-values for low-spin n ickel(III) (g(parallel to)=2.158, g(perpendicular to)=2.030, g(av)=2.0 74 at 300 K; g(parallel to)=2.162, g(perpendicular to)=2.038, g(av)=2. 080 at 77 K). It is therefore concluded that nickel(II) is oxidized to nickel(III), rather than dmbit(2-) and dmbbip(2) ligands are, by the iodine oxidation. The paramagnetic Ni(III) would be located in the axi al symmetry(D-Ah) with the electronic configuration of (d(xz)(2)d(yz)( 2)d(z2)(2)d(xy)(1)d(x2-y2)(0)).