1296882-22-8Relevant academic research and scientific papers
Synthesis and structural characterization of four zinc complexes containing 3,5-dimethylpyrazole and carboxylate ligands
Jin, Shouwen,Wang, Daqi
, p. 618 - 625 (2011/06/21)
Four new zinc(II) complexes Zn2(μ-dmpz)2(Hdmpz) 2(L1)2 (1) (Hdmpz = 3,5-dimethylpyrazole, HL1 = 2-methyl-2-phenoxypropanoic acid), Zn(Hdmpz)2(L2)2 (2) [HL2 = 2-hydroxy-5-(phenyldiazenyl)benzoic acid], Zn2(μ-dmpz) 2(Hdmpz)2(L3)2 (3) [HL3 = 3,4-(methylenedioxy) benzoic acid], and Zn2(μ-dmpz)2(Hdmpz) 2(L4)2 (4) [HL4 = 3-(4-methoxyphenyl)acrylic acid] were prepared and structurally characterized by different techniques including elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction analysis. The X-ray studies suggested that all these complexes except compound 2 are centrosymmetric dinuclear complexes with a tetrahedral arrangement around each zinc ion, whereas compound 2 is a mononuclear complex. The pyrazole ligand is coordinated in both terminal as well as a bridging fashion in the dinuclear moiety, whereas the pyrazole ligand in compound 2 is coordinated only in monodentate terminal fashion with its neutral nitrogen group. In all four complexes the carboxylate functions behave as monodentate ligands. All complexes show intramolecular hydrogen bonding of N-H...O between N-H of pyrazole and nonbonded oxygen atom of carboxylate. Furthermore, rich intermolecular weak interactions such as classical hydrogen bonds, C-H...O, C-H...N, C-H...π, and CH3-π interactions exist and complexes 1-4 display a set of 3D superamolecular frameworks. In addition, the four compounds are thermally stable below 150 °C.
