Crystal structure of nitratotetrakis(2-methylimidazole)cobalt(II) nitrate–0·5 ethanol

Abstract

The crystal structure of the title compound has been determined from three-dimensional X-ray data by Patterson and Fourier methods and refined by least-squares techniques to R 0·108 for 1434 visually estimated independent reflections. The crystals are triclinic, with unit-cell dimension a= 8·56(2), b= 9·35(2), c= 16·00(4)Å, α= 102·75(10), β= 108·0(1), γ= 91·6(1)°, space group is P and Z= 2.

The structure contains [Co (2-meim)₄(NO₃)]⁺(2-meim = 2-methylimidazole) ions and free nitrate ions. In the complex cation one bidentate nitrate group and four 2-meim form a very distorted octahedral co-ordination about the cobalt atom. Co–O Distances are 2·115 and 2·269 Å, and Co–N in the range 1·960–2·253 Å. There is some disordered ethanol in the crystal lattice.