Syntheses and characterization of nickel(II), zinc(II) and palladium(II) complexes derived from three pyrazole-based polydentate ligands

Two pyrazole-based polydentate ligands, 1,3-bis(5-methyl-3-phenylpyrazol-1-yl)-propan-2-ol (Hmppzpo) and 1,3-bis(5-methyl-3-p-isopropylphenylpyrazol-1-yl)-propan-2-ol (Hmcpzpo), have been synthesized. A third ligand, 1,3-bis(3,5-dimethylpyrazol-1-yl)-propan-2-ol (Hdmpzpo), has been synthetically mod...

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Bibliographic Details
Published in:Journal of coordination chemistry 2008-04, Vol.61 (8), p.1272-1282
Main Authors: Zhang, Guo-Fang, Yin, Mai-Hua, Dou, Yin-Li, Zhou, Qiu-Ping, She, Jiang-Bo
Format: Article
Language:English
Subjects:
Crystal structure
Polydentate ligands
Pyrazole
Zinc(II), nickel(II) and palladium(II) complexes
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Summary:Two pyrazole-based polydentate ligands, 1,3-bis(5-methyl-3-phenylpyrazol-1-yl)-propan-2-ol (Hmppzpo) and 1,3-bis(5-methyl-3-p-isopropylphenylpyrazol-1-yl)-propan-2-ol (Hmcpzpo), have been synthesized. A third ligand, 1,3-bis(3,5-dimethylpyrazol-1-yl)-propan-2-ol (Hdmpzpo), has been synthetically modified. Seven new M(II) coordination compounds of general formula M 2 L 2 X 2 (M = Zn, Ni; X = NO 3 or ClO 4 ; L = dmpzpo, mppzpo or mcpzpo) or MLX (M = Pd; L = dmpzpo; X = Cl) were synthesized and structurally characterized by elemental analysis and FT-IR analysis. The crystal structures of [Zn 2 (μ-dmpzpo-O,N,N′) 2 (NO 3 ) 2 ] · 2H 2 O (1 · 2H 2 O), [Ni 2 (μ-dmpzpo-O,N,N′) 2 (CH 3 CN) 2 ](ClO 4 ) 2 (2) and Pd(μ-dmpzpo-N,N′)Cl 2 (4) were determined by single-crystal X-ray crystallography. The crystal structures show that complexes 1 · 2H 2 O and 2 are center-symmetric dinuclear compounds, with two metal ions bridged by two alkoxo groups and each metal ion with a distorted square-pyramidal environment. The palladium complex, 4, displayed square-planar coordination geometry around the Pd(II) ion with trans arrangement.
ISSN:0095-8972
1029-0389
DOI:10.1080/00958970701572394