Synthesis, Crystal Structure, Spectral and Thermal Studies of a New Organic-Inorganic Hybrid Cobalt(II) Complex of 2,2’-Bipyridine and Nitrate with Squarate

Abstract

The [Co(NO<inf>3</inf>)(bipy)<inf>2</inf>](sq)<inf>1/2</inf> · 4H<inf>2</inf>O complex (I) (bipy: 2,2′-bipyridine, sq2-: 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 P1, with a = 7.6302(9), b = 12.0426(15), c = 14.2271(14) Å, α = 107.252(9)°, β = 98.755(9)°, γ = 103.363(9)° 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°C on heating in a static air atmosphere. The final decomposition product is CoO. © 2006 Verlag der Zeitschrift für Naturforschung.