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catena-Poly­[[bis(1H-benzotriazole-N3)­cobalt(II)]-di--tri­cyano­methan­ido-2N:N′] and catena-poly­[[bis(3,5-di­methyl-1H-pyrazole-N2)­mangan­ese(II)]-di--tri­cyano­methanido-2N:N′]

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Two new one-dimensional coordination polymers, viz. the title compounds, [Co{C(CN)3}2(C6H5N3)2]n, (I), and [Mn{C(CN)3}2(C5H8N2)2]n, (II), have been synthesized and characterized by X-ray diffraction. Both complexes consist of linear chains with double 1,5-tri­cyano­methanide bridges between neighbouring divalent metal ions. The Co and Mn atoms are located on centres of inversion. In (I), the coordination environment of the CoII atom is that of an elongated octahedron. The CoII atom is coordinated in the equatorial plane by four nitrile N atoms of four bridging tri­cyano­methanide ions, with Co—N distances of 2.106 (2) and 2.110 (2) Å, and in the apical positions by two N atoms from the benzotriazole ligands, with a Co—N distance of 2.149 (2) Å. The [Co{C(CN)3}2(C6H5N3)2] units form infinite chains extending along the a axis. These chains are crosslinked via a hydrogen bond between the uncoordinated nitrile N atom of a tri­cyano­methanide anion and the H atom on the uncoordinated N atom of a benzotriazole ligand from an adjacent chain, thus forming a three-dimensional network structure. In (II), the MnII atom also adopts a slightly distorted octahedral geometry, with four nitrile N atoms of tri­cyano­methanide ligands [Mn—N = 2.226 (2) and 2.227 (2) Å] in equatorial positions and two N atoms of the monodentate 3,5-di­methyl­pyrazole ligands [Mn—N = 2.231 (2) Å] in the axial sites. In (II), one-dimensional polymeric chains extending along the b axis are formed, with tri­cyano­methanide anions acting as bidentate bridging ligands. A hydrogen bond between the uncoordinated nitrile N atom of the tri­cyano­methanide ligand and the H atom on the uncoordinated N atom of a 3,5-di­methyl­pyrazole group from a neighbouring chain links the mol­ecule into a two-dimensional layered structure.
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Document Type: Research Article

Publication date: 2004-06-01

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