Cr(III), Mn(II), Co(II), Ni(II) and Cu(II) complexes of 7-((1H-benzo[d]imidazol-2-yl)diazenyl)-5-nitroquinolin-8-ol.synthesis, thermal, spectral, electrical measurements, molecular modeling and biological activity

The titled new azo-compound namely, 7-((1H-benzo [d]imidazol-2-y1) diazenyI)-5-nitroquinolin-8-ol, and its Cr(III), Mn(II), Ni(II) and Cu(II) complexes have been designed and prepared. These compounds were characterized by spectral and analytical techniques. The IR spectral data suggested that the free compound behaves as dibasic tridentate via deprotonated OH, NH and N atom of azo group. Cr(III) and Ni(II) complexes have octahedral, Mn(II) and Cu(II) complexes have square planar while Co(II) complex has tetrahedral geometry. The molecular parameters were calculated to secure the geometry of the complexes. The thermal studies have been undertaken as an additional information to confirm the structure of the studied complexes. The kinetic and thermodynamic parameters of the thermal decomposition steps were evaluated using three mechanistic equations at different heating rates (5-15 degrees C/min). The activities of the ligand and its complexes have been tested as antimicrobial strains. All complexes have higher biological activity than free ligand. The solid state electrical conductivity of the metal complexes was measured. (C) 2018 Elsevier B.V. All rights reserved.