Synthesis, properties and structure of copper(II) complexes of quinolyl azo derivatives of pyrazole-5-one(thione). (15th May 2018)

• Record Type: Journal Article
• Authors: Uraev, Ali I.; Lyssenko, Konstantin A.; Vlasenko, Valery G.; Zubavichus, Yan V.; Bubnov, Michael P.; Makarova, Nadezhda I.; Garnovskii, Dmitrii A.; Burlov, Anatolii S.
• Is Part Of: Polyhedron. Volume 146(2018)
• Page Start: 1
• Page End: 11
• Publication Date: 2018-05-15
• Subjects: Azo compound -- Copper(II) complexes -- EXAFS -- DFT calculations -- UV–Vis spectra; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.02.018
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Two quinolylazopyrazole-5-one(thione) ligands and their copper(II) complexes have been synthesized. Both complexes were characterized by means of different physical methods, including single-crystal X-ray diffraction studies. EPR and X-ray absorption investigations were carried out in the solid state and solution. The assignment of experimental optical data is based on computational data. Abstract: The interaction of 5-methyl-2-phenyl-4-[(8-quinolylhydrazono)]pyrazol-3-one (2 ) and 5-methyl-2-phenyl-4-(8-quinolylhydrazono)pyrazole-3-thione (4 ) with copper(II) acetate monohydrate under reflux in ethanol results in the formation of copper(II) azo chelates incorporating CuN4 O2 (5 ) and CuN3 S2 (6 ) chromophores. All the compounds were characterized with FT-IR, EPR, X-ray absorption spectroscopy and magnetic measurements. The structures of complexes5 and6 were determined by X-ray single-crystal diffraction. Complex5 adopts a pseudo-octahedral geometry with a cis disposition of the oxygen atoms around the copper(II) centre, whilst in6 the copper(II) ion displays a square-pyramidal geometry with a {N3 S2 } ligand environment.