Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0020-1693(02)01269-0
Title: Synthesis and structural behavior of ternary copper(II) complexes containing reduced Schiff base N-(2-hydroxybenzyl)-4-aminobutyric acid and 1,10-phenanthroline
Authors: Yang, C.-T. 
Vittal, J.J. 
Keywords: Crystal structures
Cu(II) compounds
PH-dependent structures
Reduced Schiff base ligands
Issue Date: 20-Feb-2003
Citation: Yang, C.-T., Vittal, J.J. (2003-02-20). Synthesis and structural behavior of ternary copper(II) complexes containing reduced Schiff base N-(2-hydroxybenzyl)-4-aminobutyric acid and 1,10-phenanthroline. Inorganica Chimica Acta 344 : 65-76. ScholarBank@NUS Repository. https://doi.org/10.1016/S0020-1693(02)01269-0
Abstract: Ternary copper(II) complexes containing reduced Schiff base ligand N-(2-hydroxybenzyl)-4-aminobutyric acid (H2Sab4) and 1,10-phenanthroline (phen) have been synthesized and characterized. Compound [Cu(Sab4)(phen)(H2O)] · 5H2O (1) was prepared from Cu(OAc)2 · H2O, H2Sab4, phen, and LiOH in the ratio 1:1:1:2 in H2O-MeOH. Green crystals of [Cu3(Sab4)2(phen)(H2O)2] (ClO4)2 · 0.5H2O (2) were isolated first from Cu(ClO4)2 · H2O, H2Sab4, phen, and LiOH in the ratio of 1:1:1:1. The filtrate furnished dark blue rhombohedral crystals of [Cu(H2Sab4)2(phen)](ClO4)2 (3), within a week. When the ratio of base was doubled, [Cu2(Sab4)(phen)3](ClO4)2 · 3H2O (4) was the only product isolated. The crystal structures of 1, 3 and 4 have been determined. In the zwitterionic mononuclear complex 1 the Cu(II) has square pyramidal geometry with a water molecule at the apical position and the carboxylate anion hydrogen bonded to the lattice water molecules. Five highly ordered water molecules present in the lattices in 1 generate an interesting 3D hydrogen bond network in the solid state. In 3, the carboxylic acid is deprotonated by the secondary amino group of the ligand to form a zwitterion. The carbonyl O atoms and the protons of phenolic and -NH2 + groups of the ligands are involved in extensive hydrogen bond network. The presence of intra and intermolecular π⋯π interactions between the two ligands is evident in 4. © 2002 Elsevier Science B.V. All rights reserved.
Source Title: Inorganica Chimica Acta
URI: http://scholarbank.nus.edu.sg/handle/10635/95087
ISSN: 00201693
DOI: 10.1016/S0020-1693(02)01269-0
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