Facile synthesis of Cu(II) complexes of monocondensed N,N,N donor Schiff base ligands: Crystal structure, spectroscopic and magnetic properties

Shouvik Chattopadhyay, Mau Sinha Ray, Michael G.B. Drew, Albert Figuerola, Carmen Diaz*, Ashutosh Ghosh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Four new copper(II) complexes, [(CuL 1 N 3 ) 2 ](ClO 4 ) 2 (1), [(CuL 2 N 3 ) 2 ](ClO 4 ) 2 (2), [CuL 3 (N 3 )(ClO 4 )] n (3) and [CuL 4 (μ-1,1-N 3 )(μ-1,3-N 3 ) (ClO 4 )] n (4) where L 1 = N 1 -pyridin-2-yl-methylene-propane-1,3-diamine, L 2 = N 1 -(1-pyridin-2-yl-ethylidene)propane-1,3-diamine, L 3 = N 1 -(1-pyridin-2-yl-ethylidene)ethane-1,2-diamine and L 4 = N 1 -(1-pyridin-2-yl-ethylidene)propane-1,2-diamine are four tridentate N,N,N donor Schiff base ligands, have been derived and structurally characterized by X-ray crystallography. Compounds 1 and 2 consist of double basal-apical end-on (EO) azide bridged dinuclear Cu II complexes with square-pyramidal geometry. In complex 3 the square planar mononuclear [CuL 3 (N 3 )] units are linked by weakly coordinated perchlorate ions in the axial positions of Cu II to form a one-dimensional chain. Two such chains are connected by hydrogen bonds involving perchlorate ions and azide groups. Compound 4 consists of 1-D chains in which the Cu II ions with a square-pyramidal geometry are alternately bridged by single EO and end-to-end (EE) azido ligands, both adopting a basal-apical disposition. Variable temperature (300-2 K) magnetic susceptibility measurements and magnetization measurements at 2 K have been performed. The results reveal that complexes 1 and 2 are antiferromagnetically coupled through azido bridges (J = -12.18 ± 0.09 and -4.43 ± 0.1 cm -1 for 1 and 2, respectively). Complex 3 shows two different magnetic interactions through the two kinds of hydrogen bonds; one is antiferromagnetic (J 1 = -9.69 ± 0.03 cm -1 ) and the other is ferromagnetic (J 2 = 1.00 ± 0.01 cm -1 ). From a magnetic point of view complex 4 is a ferromagnetic dinuclear complex (J = 1.91 ± 0.01 cm -1 ) coupled through the EO bridge only. The coupling through the EE bridge is practically nil as the N(azido)-Cu II (axial) distance (2.643 Å) is too long.

Original languageEnglish (US)
Pages (from-to)2241-2253
Number of pages13
JournalPolyhedron
Volume25
Issue number11
DOIs
StatePublished - Jul 31 2006

Keywords

  • Azide bridged
  • Cu complexes
  • Magnetic properties
  • N,N,N donor tridentate Schiff base
  • Perchlorate bridged
  • X-ray structure

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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