Syntheses, structures, and spectroscopic properties of binuclear copper(II) complexes containing N,N-bis(2-pyridylmethyl)amine ligands

Abstract

Two new m-carboxylato-bridged binuclear copper(II) complexes [Cu 2 (bpea) 2 (m-have been synthesized and structurally determined by X-ray diffraction. Complex 1 is crystallized in a monoclinic space group C2/c with unit cell parameters a ¼ 21.539(17) Å , b ¼ 12.608(10) Å , c ¼ 13.117(11) Å , ¼ 96.788(13) . In 1, each Cu(II) is five-coordinate, squarepyramidal geometry with a CuN 3 O 2 donor set. Complex 2 is crystallized in a monoclinic space group P2 1 /n with unit cell parameters a ¼ 11.346(3) Å , b ¼ 15.418(4) Å , c ¼ 11.958(3) Å , ¼ 116.519(4) . In 2, each Cu(II) also is square-pyramidal CuN 3 O 2 core, where three N-and one O-donors are equatorial and an oxygen of the bridging ligand occupies the axial site with a weak link. Elemental analyses, IR, UV and EPR spectra of the complexes were determined.

Synthesis, Crystal Structures, Characterization and Catalytic Property of Copper(II) Complexes Derived from Hydrazone Ligands

“…tense bands in the range of 1060-1110 cm -1 for the spectrum of complex 2 are due to the vibration of the perchlorate anion. 12 The weak bands in the range of 400-650 cm -1 are assigned to the vibrations of the Cu-O and Cu-N bonds.…”