Synthesis, characterization and third -order nonlinear optical properties studies of Co(II), Zn(II) and Cu(I) complexes incorporating 1-(2-(3-chloropyridine)azo)-2-acenaphthequinol ligand

摘要

A new ligand 1-(2-(3-chloropyridine)azo)-2-acenaphthequinol (3-CPAAL) and its corresponding transition metal complexes Co(3-CPAAL-H)(2)center dot 3-CPAAL center dot 0.5CH(3)OH center dot 0.5CH(2)Cl(2) (1), Zn(3-CPAAL-H)(2)center dot 3CPAAL center dot 0.5CH(3)OH center dot 0.5CH(2)Cl(2) (2), Cu(3-CPAAL) 2NO(3)center dot 2CH(3)OH (3) were designed and synthesized. The complexes 1, 2 and 3 were structurally characterized by means of IR, UVeVis spectra and X-ray single crystal diffraction. The X-ray crystal structures of 1 and 2 exhibit that the central ion (M = Co or Zn) have a pseudo-octahedral coordination environment by two oxygen atoms from acenaphthequinol units and four nitrogen atoms of azo and pyridine units. However, the structure of the complex 3 cationic reveals a seesaw coordination geometry and the copper is four-coordinate bonding to two nitrogen atoms come from azo units and two nitrogen atoms from the chloropyridine rings. The third-order nonlinear optical (NLO) properties of both ligand and complexes 1, 2 and 3 were determined by Z-scan technique with 42 fs laser pulses at 2 kHz repetition rate. (C) 2020 Published by Elsevier B.V.