Crystal structure of Bis(2,6-diacetylpyridine dihydrazone)cobalt(II) diiodide monohydrate

Abstract

The crystal structure of the title compound, [Co(C₉H₁₃N₅)₂] I₂,H₂O, has been determined by single-crystal X-ray diffraction at 295 K and refined by least squares to a residual of 0.058 for 3255 'observed' reflections. Crystals are triclinic, Pī, a 14.934(5), b 11.315(4), c 8.090(3)Ǻ, α 85.19(3), β 87.76(3), γ 74.10(3)°, Z 2. The distances from the cobalt to the central trimethine nitrogen atoms are 1.893(8) and 1.903(8)Ǻ consistent with the almost low-spin behaviour of the complex; the distal Co-N distances range between 2.045(8) and 2.140(8)Ǻ. One of the iodide anions appears to be disordered over two sites populated in the ratio 0.86:0.14; occupancy of the second site together with the magnetic moment of 2.1 BM may indicate a small proportion of the high-spin isomer.