Incorporation of a sodium ion guest in the host of copper (II)-Schiff-base complexes: structural characterization and magnetic study

Mukherjee, Pampa ; Drew, Michael G. B. ; Figuerola, Albert ; Ghosh, Ashutosh (2008) Incorporation of a sodium ion guest in the host of copper (II)-Schiff-base complexes: structural characterization and magnetic study Polyhedron, 27 (16). pp. 3343-3350. ISSN 0277-5387

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.poly.2008.07.025

Abstract

Three copper(II) complexes, [CuL1], [CuL2] and [CuL3] where L1, L2 and L3 are the tetradentate di-Schiff-base ligands prepared by the condensation of acetylacetone and appropriate diamines (e.g. 1,2-diaminoethane, 1,2-diaminopropane and 1,3-diaminopropane, respectively) in 2:1 ratios, have been prepared. These complexes act as host molecules and include a guest sodium ion by coordinating through the oxygen atoms to result in corresponding new trinuclear complexes, [(CuL1)2Na(ClO4)(H2O)][CuL1] (1), [(CuL2)2Na(ClO4)(H2O)] (2) and [(CuL3)2Na(ClO4)(H2O)] (3) when crystallized from methanol solution containing sodium perchlorate. All three complexes have been characterized by single crystal X-ray crystallography. In all the complexes, the sodium cation has a six-coordinate distorted octahedral environment being bonded to four oxygen atoms from two Schiff-base complexes of Cu(II) in addition to a perchlorate anion and a water molecule. The copper atoms are four coordinate in a square planar environment being bonded to two oxygen atoms and two nitrogen atoms of the Schiff-base ligand. The variable temperature susceptibilities for complexes 1–3 were measured over the range 2–300 K. The isotropic Hamiltonian, for complex 1 and for complexes 2 and 3 has been used to interpret the magnetic data. The best fit parameters obtained are: g1 = g2 = 2.07(0), J = −1.09(1) cm−1 for complex 1, g1 = g2 = 2.06(0), J = −0.55(1) cm−1 for complex 2 and g1 = g2 = 2.07(0), J = −0.80(1) cm−1 for 3. Electrochemical studies displayed an irreversible Cu(II)/Cu(I) one-electron reduction process.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Copper (II); Sodium Perchlorate Adduct; Schiff Base; X-ray Structure; Magnetic Properties
ID Code:108359
Deposited On:13 Oct 2017 13:07
Last Modified:13 Oct 2017 13:07

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