CRYSTAL AND MOLECULAR-STRUCTURE TRANS-AZIDOBIS (DIMETHYLGLYOXIMATO) PYRIDINECOBALT(III)
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abstract
Crystals of trans-azidobis(dimethylglyoximato)pyridinecobalt(III) are monoclinic, space group P21/c. The unit cell constants are a = 8.731(3), b = 13.982(3), c = 17.961(5) A, = 126.80(1), V = 1755.7 A3, and Z = 4. The structure was determined from three dimensional X-ray data (2152 independent reflections) obtained by the 2 scan method using a CAD-4 automated four-circle diffractometer. Structure solution was effected by Patterson and Fourier methods and refined by block diagonal least squares method to a conventional R value of 0.041. The two dimethyl glyoximato monoanions occupy the equatorial plane with pyridine and azide groups in the axial positions. Azide N-N bond distances were found to be 1.155(6) and 1.126(7) A with the longer bond adjacent to the cobalt atom. Cobalt-nitrogen bonds in the axial positions are significantly longer than those in the equatorial plane. Although the OO interatomic distances between the separate oxime anions are close to 2.5 A the hydrogen bonding is decidedly unsymmetrical. 1978 Gordon and Breach Science Publishers Ltd.
