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Issue 41, 2006
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Ferromagnetic vs. antiferromagnetic coupling in bis(µ2-1,1-azido)dinickel(ii) complexes with syn- and anti-conformations of the end-on azide bridges

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Abstract

Reaction of a 1 : 1 : 1 molar ratio of NiCl2, NaN3 and H2L, a tetradentate ligand N-(2-pyridyl)methyl)-N,N-bis(2′-hydroxy-3′,5′-dimethylbenzyl)amine in methanol in presence of Et3N results in a turquoise precipitate, which affords deep green crystals of [Ni2(HL)2(N3)2]·1.5CH2Cl2 (1) and [Ni2(HL)2(N3)2]·H2O (2) upon crystallization from CH2Cl2MeOH or THF–MeOH, respectively. Both complexes reveal distorted octahedral NiN4O2 coordination environments around the Ni(II) centers with bis(µ-1,1-azido) bridging ligands. Complex 1 displays an unprecedented small Ni–N–Ni bridge angle of 90.4°, whereas 2 contains the said angle of av. 98.7° lying in the usual range observed for other comparable structures. The variable-temperature magnetic susceptibility together with the variable-field, variable-temperature (VTVH) magnetization measurements discern different ground states of St = 0 for 1 and St = 2 for 2. The magnetic behaviours of these compounds are discussed in the context of the known bis(end-on azido) bridging dinickel(II) complexes.

Graphical abstract: Ferromagnetic vs. antiferromagnetic coupling in bis(µ2-1,1-azido)dinickel(ii) complexes with syn- and anti-conformations of the end-on azide bridges

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Article information


Submitted
19 Jul 2006
Accepted
01 Sep 2006
First published
06 Sep 2006

Dalton Trans., 2006, 4962-4968
Article type
Paper

Ferromagnetic vs. antiferromagnetic coupling in bis(µ2-1,1-azido)dinickel(II) complexes with syn- and anti-conformations of the end-on azide bridges

P. Chaudhuri, R. Wagner, S. Khanra and T. Weyhermüller, Dalton Trans., 2006, 4962
DOI: 10.1039/B610308A

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