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

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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 – stacking interactions of the quinoxaline mol­ecules, resulting in the formation of a three-dimensional structure.
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Document Type: Research Article

Publication date: 2004-10-01

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