Synthesis, molecular modeling and spectroscopic characterization of nickel(II), copper(II), complexes of new 16-membered mixed-donor macrocyclic schiff base ligand incorporating a pendant alcohol function

Complexes of Cu(II) and Ni(II) of the composition [M(L)X] [where M = Ni(II), Cu(II) and X = Cl−, NO3−, CH3COO−] were synthesized with 1,5-dioxo-9,10-diaza-3,ol-tribenzo-(7,6,10,11,14,15) peptadecane, a N2O2 macrocyclic ligand. The complexes were characterized by elemental analysis, molar conductance measurements, UV–vis, IR, 1H NMR, 13C NMR, EPR and molecular modeling studies. All the complexes are non-electrolyte in nature. On the basis of spectral studies, an octahedral geometry has been assigned for Ni(II) complexes and a tetragonal geometry for Cu(II) complexes.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We have synthesized shiff's base macrocyclic complexes. ► We have characterized the ligand and complexes by IR, mass. NMR, UV, EPR etc. ► For the confirmation of geometry of ligand and complexes, molecular modeling has been provided. ► On the basis of above spectral studies and molecular modeling a distorted octahedral geometry has been assigned for Ni(II) and tetragonal geometry for Cu(II) complexes.