Issue 44, 2009
From the journal:

Dalton Transactions

Molecular squares of NiII and CuII: ferromagnetic exchange interaction mediated by syn–anticarboxylate-bridging†

Himanshu Arora,a   Francesc Lloretb  and  Rabindranath Mukherjee*a  

* Corresponding authors

a Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, India
E-mail: rnm@iitk.ac.in
Fax: +91 512 2597436
Tel: +91 512 2597437

b Instituto de Ciencia Molecular (ICMol), Universidad de València, Polígono de la Coma, s/n, Paterna, València, Spain

Abstract

The synthesis of four discrete tetranuclear complexes {[NiII(L2)][ClO4]}4·MeCN (1), {[CuII(L1)(O3SCF3)]}4·H2O (2), {[CuII(L3)(OClO3)]}4·MeCN (3) and {[CuII(L4)][ClO4]}4·3MeCN·4H2O (4), supported by a closely similar group of carboxylate–appended (2–pyridyl)alkylamine ligands [L1(−): 3-[N-methyl-{2-(pyridin-2-yl)ethyl}amino]propionate; L2(−): 3-[(2-(pyridin-2-yl)ethyl){2-(pyridin-2-yl)methyl}amino]propionate; L3(−): 3-[N-isopropyl-{2-(pyridin-2-yl)methyl}amino]propionate and L4(2−): 3-[N-{2-(pyridin-2-yl)methyl}amino]-bis(propionate)] is described. Structural characterization reveals that each NiII centre in 1 has square-pyramidal NiIIN3O2 coordination and each CuII centre in 2–4 has distorted square-pyramidal CuIIN2O3 coordination, utilizing three N and one carboxylate O in 1 and two N and carboxylate O (one in 2 and 3; two in 4) of the ligand and the fifth/fourth coordination is provided by an oxygen atom belonging to the carboxylate group of an adjacent molecule. A CF3SO3− or a ClO4− ion provides an O coordination in 2 and 3, respectively. Temperature-dependent magnetic studies reveal the existence of ferromagnetic exchange interaction in each case, due to the presence of equatorial–equatorial syn–anticarboxylate bridge between MII centres.

Graphical abstract: Molecular squares of NiII and CuII: ferromagnetic exchange interaction mediated by syn–anticarboxylate-bridging

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Article information

DOI
https://doi.org/10.1039/B905463D
Article type
Paper
Submitted
18 Mar 2009
Accepted
04 Sep 2009
First published
28 Sep 2009

Dalton Trans., 2009, 9759-9769

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Molecular squares of NiII and CuII: ferromagnetic exchange interaction mediated by syn–anticarboxylate-bridging

H. Arora, F. Lloret and R. Mukherjee, Dalton Trans., 2009, 9759 DOI: 10.1039/B905463D

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