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Synthesis and structural characterization of three zinc coordination complexes based on 3,5-dimethylpyrazole and carboxylate ligands

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Three new zinc(II) complexes, Zn(Hdmpz)2(L1)2 (1) (Hdmpz = 3,5-dimethylpyrazole, HL1 = 1-hydroxy-2-naphthoic acid), Zn2(Hdmpz)4(L2)2 (2) (HL2 = maleic acid), and Zn3(µ-dmpz)4(Hdmpz)2(L3) (3) (HL3 = phthalic acid), were prepared and structurally characterized by elemental analysis, infrared spectra, thermogravimetric analysis, and single-crystal X-ray diffraction analysis. X-ray crystallographic studies show that these complexes display mononuclear to coordination polymer structures with a tetrahedral arrangement around each zinc ion. Pyrazole is coordinated both in terminal and bridging in 3, whereas in 1 and 2 both are coordinated only monodentate. In 1 the carboxylates are monodentate, while in 2 and 3 both function as bridging bis-monodentate ligands. Rich intra- and inter-molecular weak interactions such as classical hydrogen bonds, C-H ··· O, CH3 ··· O, C-H ··· π, and CH3-π interactions are analyzed.
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Keywords: 3,5-Dimethylpyrazole; Carboxylate ligands; Crystal structure; Non-bonding interaction; Zinc(II)

Document Type: Research Article

Affiliations: 1: Faculty of Science, ZheJiang A & F University, Lin'An 311300, P.R. China 2: Department of Chemistry, Liaocheng University, Liaocheng 252059, P.R. China

Publication date: June 1, 2011

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