Structural, Spectral, and Magnetic Properties of End-to-End Di-μ-thiocyanato-Bridged Polymeric Complexes of Ni(II) and Co(II). X-ray Crystal Structure of Di-μ-thiocyanatobis(imidazole)nickel(II)

Thiocyanatonickel(II) and thiocyanatocobalt(II) complexes of the composition Ni(NCS)2(HIm)2 (1) and Co(NCS)2(HIm)2 (2), where HIm = imidazole, were prepared and studied. In particular, the crystal structure of Ni(NCS)2(HIm)2 was determined by X-ray methods. This compound crystallizes in the monoclinic system, space group P21/n, with a = 7.720(1) Å, b = 5.557(1) Å, c = 13.774(3) Å, β = 102.54(3)°, and Z = 2. Its structure consists of a one-dimensional polymeric chain in which nickel(II) ions are bridged by two thiocyanate groups bonding in an end-to-end fashion in a trans arrangement. The Ni···Ni distance is 5.557(1) Å. The crystal packing is determined by the intermolecular hydrogen bonds and ring-stacking interactions. From their X-ray powder-diffraction patterns and IR spectra, the complexes 1 and 2 were found to be mutually isomorphous. The coordination compounds were identified and characterized using elemental analysis, magnetic measurements, and infrared and ligand-field spectra. Both complexes are first examples of ferromagnetically coupled one-dimensional polymeric compounds with double end-to-end thiocyanate bridges. The magnetic properties of the title compounds were investigated over the 1.9−290 K temperature range. The compounds exhibit long-range magnetic ordering with Tc equal to 5.0 and 5.5 K for 1 and 2, respectively. Their isothermal magnetization was also studied. The magnetostructural properties of the nickel(II) compound obtained are discussed and compared to those of other double end-to-end thiocyanate-bridged nickel(II) complexes

Structural, Spectral, and Magnetic Properties of End-to-End Di-μ-thiocyanato-Bridged Polymeric Complexes of Ni(II) and Co(II). X-ray Crystal Structure of Di-μ-thiocyanatobis(imidazole)nickel(II)

Thiocyanatonickel(II) and thiocyanatocobalt(II) complexes of the composition Ni(NCS)2(HIm)2 (1) and Co(NCS)2(HIm)2 (2), where HIm = imidazole, were prepared and studied. In particular, the crystal structure of Ni(NCS)2(HIm)2 was determined by X-ray methods. This compound crystallizes in the monoclinic system, space group P21/n, with a = 7.720(1) Å, b = 5.557(1) Å, c = 13.774(3) Å, β = 102.54(3)°, and Z = 2. Its structure consists of a one-dimensional polymeric chain in which nickel(II) ions are bridged by two thiocyanate groups bonding in an end-to-end fashion in a trans arrangement. The Ni···Ni distance is 5.557(1) Å. The crystal packing is determined by the intermolecular hydrogen bonds and ring-stacking interactions. From their X-ray powder-diffraction patterns and IR spectra, the complexes 1 and 2 were found to be mutually isomorphous. The coordination compounds were identified and characterized using elemental analysis, magnetic measurements, and infrared and ligand-field spectra. Both complexes are first examples of ferromagnetically coupled one-dimensional polymeric compounds with double end-to-end thiocyanate bridges. The magnetic properties of the title compounds were investigated over the 1.9−290 K temperature range. The compounds exhibit long-range magnetic ordering with Tc equal to 5.0 and 5.5 K for 1 and 2, respectively. Their isothermal magnetization was also studied. The magnetostructural properties of the nickel(II) compound obtained are discussed and compared to those of other double end-to-end thiocyanate-bridged nickel(II) complexes