ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, vol.61, no.10, pp.1249-1253, 2006 (SCI-Expanded)
The [Co(NO3)(bipy)(2)](sq)(1/2)center dot 4H(2)O complex (1) (bipy: 2,2'-bipyridine, sq(2-): squarate) has been prepared and characterized by elemental analysis, IR, UV/vis spectra, thermal analysis, and single crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P!, with a = 7.6302(9), b = 12.0426(15), c = 14.2271(14) angstrom, alpha = 107.252(9)degrees, beta = 98.755(9)degrees, gamma = 103.363(9)degrees and Z = 2. The Co(II) ion in its octahedral complex is chelated by the nitrogen atoms of the two 2,2'-bipyridine, and by two oxygen atoms of the nitrato group. The anionic squarate behaves as a counter ion. Thermal analysis has shown that the title compound decomposes in three stages over the range 20-1000 degrees C on heating in a static air atmosphere. The final decomposition product is CoO.