Abstract

The new 4-acylpyrazolone 1-(4-chlorophenyl)-3-phenyl-4-thenoyl-1H-pyrazol-5-ol (HCPTP) and its Ni(II) complex [Ni(CPTP)2(C2H5OH)2](C2H5OH)2 were synthesized. The ligand and the complex were characterized by elemental analyses, IR and UV/Vis spectroscopy, thermal analyses, and single-crystal X-ray diffraction. Crystals of HCPTP are monoclinic, space group P21/c with Z = 4 while [Ni(CPTP)2(C2H5OH)2](C2H5OH)2 belongs to the triclinic system, space group P1̄ with Z = 2. The complex has a six-coordinated Ni(II) center in a distorted octahedral configuration with two ethanol ligands in cis position. These octahedral units are connected through hydrogen bonds via the coordinated and uncoordinated ethanol molecules.

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