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Synthesis, Structure, Antibacterial and Spectroscopic Properties of a Zinc(II) Complex with the Ligand 4‐Heptanoyl‐pyrazol‐5‐one
Author(s) -
Xu LiYing,
Li Ning,
Li JiaMin,
Dong Wei
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200513
Subject(s) - ligand (biochemistry) , zinc , crystallography , molecule , chemistry , hydrogen bond , intermolecular force , excited state , infrared spectroscopy , metal , thermogravimetric analysis , square pyramidal molecular geometry , crystal structure , organic chemistry , receptor , biochemistry , physics , nuclear physics
The long‐chain ligand, 1‐phenyl‐3‐methyl‐4‐heptanoyl‐pyrazol‐5‐one (HL) and its zinc(II) complex ZnL 2 were synthesized. The structure and the properties of ZnL 2 were characterized by elemental analysis, IR spectroscopy, X‐ray diffraction, and thermogravimetric analysis. The zinc ion is five‐coordinated in a square‐pyramidal environment by four oxygen atoms of the HL ligands in the equatorial plane and one water molecule in the axial position. The water molecule is directly bonded to Zn 2+ and involved in intermolecular hydrogen bonding network. The complex and its corresponding ligand were screened in vitro against some strains of the human pathogenic bacteria. The metal complex exhibits higher antibacterial activity than its corresponding ligand. The complex exhibits purple effect emission as the result of fluorescence from the intraligand emission excited state.