Crystal structure and characterization of a new copper(II) chloride dimer with meth-yl(pyridin-2-yl-methyl-idene)amine.

ABSTRACT: The new copper(II) complex, namely, di-?-chlorido-bis-{chlorido-[meth-yl(pyri-din-2-yl-methyl-idene)amine-?² N,N']copper(II)}, [Cu₂Cl₄(C₇H₈N₂)₂], (I), with the ligand 2-pyridyl-methyl-N-methyl-imine (L, a product of Schiff base condensation between methyl-amine and 2-pyridine-carbaldehyde) is built of discrete centrosymmetric dimers. The coordination about the Cu^II ion can be described as distorted square pyramidal. The base of the pyramid consists of two nitro-gen atoms from the bidentate chelate L [Cu-N = 2.0241?(9), 2.0374?(8)?Å] and two chlorine atoms [Cu-Cl = 2.2500?(3), 2.2835?(3)?Å]. The apical position is occupied by another Cl atom with the apical bond being significantly elongated at 2.6112?(3)?Å. The trans angles of the base are 155.16?(3) and 173.79?(2)°. The Cu?Cu separation in the dimer is 3.4346?(3)?Å. In the crystal structure, the loosely packed dimers are arranged in stacks propagating along the a axis. The X-band polycrystalline 77?K EPR spectrum of (I) demonstrates a typical axial pattern characteristic of mononuclear Cu^II complexes. Compound (I) is redox active and shows a cyclic voltammetric response with E _1/2 = -0.037?V versus silver-silver chloride electrode (SSCE) assignable to the reduction peak of Cu^II/Cu^I in methanol as solvent.

SUBMITTER: Vassilyeva OY 

PROVIDER: S-EPMC7274002 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature