Ternary copper(II) complexes of aroylhydrazones and mono/bidentate heterocycles with different structures: synthesis, crystal structure and properties

Abstract

Two mixed-ligand Cu(II) complexes, [CuL 1 (Himdz] Á CH 3 OH (1) and [CuL 2 (phen)] Á 0.5DMF (2), with different structures have been synthesized by using substituted aroylhydrazones, 5-bromo-salicylaldehyde-benzoylhydrazone (H 2 L 1 ) and 5-bromo-salicylaldehyde-3,5-dimeth oxy-benzoylhydrazone (H 2 L 2 ), and mono/bidentate heterocycles, imidazole (Himdz) and 1,10-phenanthroline (phen). Their crystal structures and spectroscopic properties have been studied. X-ray analysis show a distorted square-planar geometry for 1 and a distorted squarepyramidal geometry for 2, in which the chelating phen ligand displays axial-equatorial bonding. In both structures the ONO tridentate ligand occupies the basal plane. Self-assembly via O-H Á Á Á N, N-H Á Á Á O and C-H Á Á Á O interactions lead to one-dimensional chain arrangement in 1 and 2.

Bis[2-(5-methylsulfanyl-1,3,4-oxadiazol-2-yl-κN3)phenolato-κO1]copper(II)

“…Several mononuclear compounds with similar structures have been reported previously (Kala et al, 2007;Liu et al, 2008). The whole molecule is planar with a small deviation at C8 from the mean plane.…”

“…For general background to derivatives of dithiocarbazate ligands and their metal complexes, see: Beghidja et al (2005;; Bouchameni et al (2011); Beghidja, Bouslimani & Welter (2007); Beghidja, Rogez & Welter (2007). For similar structures, see: Kala et al (2007); Liu et al (2008); Zhang et al (2001). For the preparation of the ligand, see: Dolman et al (2006); Young & Wood (1955).…”

Synthesis and Structures of Two Mononuclear Cu(II) Complexes Derived from 3-Methoxysalicylaldehyde Benzoylhydrazide Ligand

“…The Cu(II) metal centers lie 0.067 and 0.075 Å above the O2N2 square planes for complexes 1 and 2, respectively. However, Square-planar Cu(II) complexes are known to form dimeric species containing equatorial-apical bridges due to the involvement of the metal ion in weak interactions with another atom of a neighboring molecule at the apical position 24,25 . Complex 2 forms a centrosymmetric dimeric species due to weak apical coordination of the phenolate-O in a reciprocal fashion (Fig.…”