Acta Crystallographica Section C

Crystal Structure Communications

Volume 65, Part 1 (January 2009)

metal-organic compounds

Acta Cryst. (2009). C65, m28-m32 [ doi:10.1107/S0108270108041152 ]

Two transition metal coordination polymers of the 7,7,8,8-tetracyanoquinodimethane dianion (TCNQ^2-)

G. Wang, C. Slebodnick and G. T. Yee

Abstract: Each of the two novel title transition metal coordination polymers, namely catena-poly[[bis{[tris(2-pyridylmethyl)amine]cobalt(II)}- [mu] ₄-7,7,8,8-tetracyanoquinodimethanide(2-)] bis[7,7,8,8-tetracyanoquinodimethanide(1-)] methanol disolvate], {[Co₂(C₁₂H₄N₄)(C₁₈H₁₈N₄)₂](C₁₂H₄N₄)₂·2CH₃OH}_n, (I), and catena-poly[[[[tris(2-pyridylmethyl)amine]iron(II)]- [mu] ₂-7,7,8,8-tetracyanoquinodimethanide(2-)] methanol solvate], {[Fe(C₁₂H₄N₄)(C₁₈H₁₈N₄)]·CH₃OH}_n, (II), contains [eta] ⁴-TPA and cis-bridging TCNQ^2- ligands [TPA is tris(2-pyridylmethyl)amine and TCNQ is 7,7,8,8-tetracyanoquinodimethane], but the two compounds adopt entirely different structural motifs. Compound (I) consists of a ribbon coordination polymer featuring [mu] ₄-TCNQ^2- radical anion ligands bridging four different octahedral Co^II centers. Each formula unit of the polymer is flanked by two uncoordinated TCNQ^- anions and two methanol solvent molecules. All three TCNQ anions have crystallographic inversion symmetry. In (II), the 2₁ symmetry operator generates a one-dimensional zigzag chain of octahedral Fe^II centers with [mu] ₂-TCNQ^2- bridges. A methanol solvent molecule forms hydrogen bonds to one of the terminal N atoms of the bridging TCNQ^2- dianion. To the best of our knowledge, these are the first examples of one-dimensional coordination polymers forming from cis coordination of two TCNQ ligands to octahedral metal centers.

Formula: [Co₂(C₁₂H₄N₄)(C₁₈H₁₈N₄)₂](C₁₂H₄N₄)₂·2CH₃OH and [Fe(C₁₂H₄N₄)(C₁₈H₁₈N₄)]·CH₃OH


	Structure factor file (CIF format) (279.8 kbytes) [ doi:10.1107/S0108270108041152/sq3174Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (257.4 kbytes) [ doi:10.1107/S0108270108041152/sq3174IIsup3.hkl ] Contains datablock II

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