Azo Complexes of Cu(II), Co(II), Ni(II), Cd(II), Th(IV), and UO2(VI) Ions. Mixed-Ligand Complexes, Pyrolysis Products and Biological Activity

• Published in: Synthesis and reactivity in inorganic and metal-organic chemistry Vol. 34; no. 8; pp. 1349 - 1378
• Main Authors: Mashaly, Mahmoud M., Ramadan, Atef T., El-Shetary, Basheir A., Dawoud, Areej K.
• Format: Journal Article
• Language: English
• Published: PHILADELPHIA Taylor & Francis Group 01.09.2004; Taylor & Francis
• Subjects: Azo complexes; Biological activity; Chemistry; Chemistry, Inorganic & Nuclear; Mixed-ligand; Physical Sciences; Pyrolysis; Science & Technology; ELECTROCHEMISTRY; biological activity; AZOPYRIMIDINES; CONSTANTS; COPPER(II); COBALT(II); SPECTRAL CHARACTERIZATION; NICKEL(II); RAY CRYSTAL-STRUCTURE; mixed-ligand; azo complexes; pyrolysis; CHEMISTRY; MONOBROMOACETATES
• ISSN: 0094-5714; 1532-2440
• DOI: 10.1081/SIM-200026204

The reactions of azo ligand, 2-[2′-carboxyphenylazo]-5,5-dimethyl-1,3-cyclohexane-dione, (H 2 L), with the metal ion Cd(II), Cu(II), Ni(II), Co(II), Th(IV), or UO 2 (VI) in the presence of LiOH as a deprotonating agent, yielded binary mononuclear complexes. The binary Cu(II) complex reacts with the ligands 1,10-phenanthroline or 2-aminopyridine to form mixed-ligand complexes. All the binary complexes of Cd(II), Cu(II), and Ni(II) have octahedral configurations, while the Co(II) complex is square-planar. The binary complexes of Th(IV) and UO 2 (VI) have distorted dodecahedral geometries. The mixed-ligand complexes have octahedral configurations. Thermal studies on these complexes showed the possibility of obtaining new complexes pyrolytically, where the complexes decompose through several isolable as well as non-isolable intermediates during heating. The structures of all complexes and the corresponding thermal products were elucidated by elemental analyses, conductance, IR and electronic absorption spectra, magnetic moments, 1 H NMR and TG-DSC measurements as well as by mass spectroscopy. The ligand and some of the complexes were found to activate the enzyme pectinlyase.