Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 10 (October 2004)

metal-organic compounds

Acta Cryst. (2004). C60, m520-m522 [ doi:10.1107/S0108270104020657 ]

catena-Poly[[bis(quinoxaline-N)cobalt(II)]-di--dicyanamido-²N¹:N⁵] and catena-poly[[bis(quinoxaline-N)copper(II)]-di--dicyanamido-²N¹:N⁵]

J. Luo, B.-S. Liu, X.-G. Zhou, L.-H. Weng, Y.-R. Li and H.-X. Wu

Abstract: Two new complexes, [Co(C₂N₃)₂(C₈H₆N₂)₂], (I), and [Cu(C₂N₃)₂(C₈H₆N₂)₂], (II), are reported. They are essentially isomorphous. Complex (I) displays distorted octahedral geometry, with the Co atom coordinated by four dicyanamide nitrile N atoms [Co-N = 2.098 (3) and 2.104 (3) Å] in the basal plane, along with two monodentate quinoxaline N atoms [Co-N = 2.257 (2) Å] in the apical positions. In complex (II), the Cu atom is surrounded by four dicyanamide nitrile N atoms [Cu-N = 2.003 (3) and 2.005 (3) Å] in the equatorial plane and two monodentate quinoxaline N atoms [Cu-N = 2.479 (3) Å] in the axial sites, to form a distorted tetragonal-bipyramidal geometry. The metal atoms reside on twofold axes of rotation. Neighbouring metal atoms are connected via double dicyanamide bridges to form one-dimensional infinite chains. Adjacent chains are then linked by [pi] - [pi] stacking interactions of the quinoxaline molecules, resulting in the formation of a three-dimensional structure.

Formula: [Co(C₂N₃)₂(C₈H₆N₂)₂] and [Cu(C₂N₃)₂(C₈H₆N₂)₂]


	Structure factor file (CIF format) (100.3 kbytes) Contains datablock I

	Structure factor file (CIF format) (90.8 kbytes) Contains datablock II

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