Synthesis and Crystal Structure of a Novel Copper(II) Complex Derived from N,N′-Bis(3-ethoxysalicylidene)-1,2-ethanediamine

Abstract

A novel mononuclear copper(II) complex, [CuL] 2 ·C 2 H 10 N 2 ·2ClO 4 (H 2 L = N,N -bis(3-ethoxysalicylidene)-1,2-ethanediamine), has been synthesized and characterized by elemental analysis and single-crystal x-ray diffraction. The compound consists of two mononuclear copper(II) complex molecules, two perchlorate anions, and one protonated ethane-1,2-diamine molecule that bridges adjacent two copper(II) complex molecules through hydrogen bonds. The Cu II atom is four-coordinate in a square-planar geometry, with two imino N and two phenolic O atoms of the Schiff base ligand.

The Unexpected Synthesis, Crystal Structure, and Thermal Stability of a Copper(II) Complex Derived from 2-[(2-Phenylaminoethylimino)methyl]benzoic Acid

“…[1][2][3][4][5] In recent years, a large number of copper(II) complexes with Schiff bases derived from salicylaldehyde and its derivatives have been reported. [6][7][8][9] 2-Formylbenzoic acid is a structurally similar compound to salicylaldehyde, however, no complexes with the Schiff bases derived from 2-formylbenzoic acid have been reported so far. As an exploration of the work on the preparation of the complexes with such ligands, in the present paper, a new mononuclear copper(II) complex, [Cu(PIBA) 2 (OH 2 )], where PIBA is the anionic form of 2-(1-phenylimidazolidin-2-yl)benzoic acid (HPIBA; Scheme 1), has been unexpectedly obtained from the reaction of 2-formylbenzoic acid, N-phenylethane-1,2-diamine, and copper perchlorate in methanol.…”