Syntheses and crystal structures of the metal complexes based on pyrazolecarboxylic acid ligands

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Abstract

This paper aims at introducing five new metal complexes, Co(HL1)2(H2O)2(1), {[Cu(HL1)2] · (H2O)}n(2), {[Zn(HL2)(H2O)3] · 2H2O}n(3), {[Co(HL2)(H2O)3] · 2H2O}n(4) and [K(H2L2)]n(5), (in which H2L1is 3-methyl-5-pyrazolecarboxylic acid and H3L2is 3,5-pyrazoledicarboxylic acid, respectively), which have been synthesized under hydrothermal conditions or by using diffusion methods. Their molecular structures have been characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction analyses. The X-ray analyses reveal that complex 1 has a mononuclear structure, which is further assembled to a three-dimensional (3-D) framework through intermolecular hydrogen bonds; complex 2 is a 1-D coordinated polymer, which is further assembled to a 2-D layer through intermolecular hydrogen bonds and π-π interactions; both complexes 3 and 4 possess similar 1-D chain structures, and the adjacent chains are further linked by hydrogen bonds to form 2-D supramolecular networks; complex 5 exhibits a 3-D structure, in which, the metal-metal weak interaction, K-K, plays an important role. © 2008 Elsevier B.V. All rights reserved.

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An, C., Lu, Y., Shang, Z., & Zhang, Z. (2008). Syntheses and crystal structures of the metal complexes based on pyrazolecarboxylic acid ligands. Inorganica Chimica Acta, 361(9–10), 2721–2730. https://doi.org/10.1016/j.ica.2008.01.043

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