Acta Cryst. (2006). E62, m2045-m2046  [ doi:10.1107/S1600536806029618 ]

catena-Poly[[[bis(1H-benzimidazole-N³)cobalt(II)]-di--azido] dihydrate]

C. Zhang, H.-Q. Ai, D.-Z. Sun and S. W. Ng

Abstract: The crystal structure of the title compound, {[Co(N₃)₂(C₇H₆N₂)₂]·2H₂O}_n, consists of a di--azido-bridged [Co(N₃)₂]_n chain that propagates along the c axis of the orthorhombic unit cell, together with uncoordinated water molecules. Adjacent Co-N-Co-N rhombi are coplanar; the metal atom lies on a special position of 2/m site symmetry and the azide groups on special positions of site symmetry 2. The heterocycle lies on a mirror plane. The heterocycles are positioned above and below the rhombi so that the geometry of Co is an all-trans octahedral. The chain motif is consolidated by hydrogen bonding with the uncoordinated water molecules, which lie on mirror planes.

Online 4 August 2006

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