P. Khodadad

Structure du dinitratobis[tris(diméthylamide) phosphorique]cobalt(II)

Co(C6H IsN3OP)2(NO3)2 ) , C12H36C0 - NsOsP2, monoclinic, B2/b, a = 18.50 (2), b = 16.43 (2), c = 8.377 (7)A, 7= 91.8 (1) °, Z = 4, O m = 1.45 (3), D c = 1.420 Mg m -3. The crystal structure has been determined by the heavy-atom method and refined by least-squares procedures to R = 0.043 for 1851 independent reflections. The structure can be regarded as consisting either of layers parallel to the (010) plane, of layers parallel to the (100) plane or of columns parallel to Oz and built up along the twofold axes. The Co atom is surrounded by six O atoms forming a very irregular octahedral arrangement. It is bonded to two nitrate groups and two hexamethyl- phosphoramide molecules. The nitrate ligands are bidentate and the two hexamethylphosphoramide ligands occupy cis positions in the Co coordination polyhedron.