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Issue 13, 2008
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Low-dimensional copper(ii) complexes triply bridged with azide/carboxylate/DMSO showing very strong ferromagnetic interaction and influence of dipolar fields at low temperatures: a quantum Monte Carlo magnetic study

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Abstract

Two one-dimensional (1D) azido, carboxylato and DMSO triply bridged coordination polymers of formula [Cu(µ1,1-N3)(µ1,3-(C4H3S–CH2COO))(µ-DMSO)]n (1) and [Cu3(µ1,1-N3)4(µ1,3-(C4H3S–COO)2)(µ-DMSO)2]n (2) have been synthesized, structurally characterized, and their magnetic properties have been studied. Cu(II) atoms in 1 are triply bridged by an EO type azide, a syn–syn carboxylate and a µ-O from a DMSO molecule. Complex 2 presents a trinuclear repeating unit in which the Cu(II) atoms are triply bridged in a fashion identical to 1, while the trinuclear moieties are linked through two centrosymmetrically related EO azides. The variable-temperature magnetic susceptibilities of complexes 1 and 2 have been measured in the range 2–300 K under various external fields in the range 0.02–1.0 T. Both curves are almost superimposable with small differences in the low temperature range and reflect the same ferromagnetic behaviour in almost all the temperature range. Quantum Monte Carlo (QMC) studies were carried out in order to fit the susceptibility curves of the two compounds. The simulated parameters are J = 126(2) cm−1, g = 2.15(1) for compound 1 and J1 = 126(2) cm−1, J2 = 80(3) cm−1g = 2.17(1) for compound 2, proving that large ferromagnetic interactions exist in both compounds. EPR studies showed the temperature dependence of g-factors. The important g shift in the temperature range 4–100 K is attributed to internal dipolar magnetostatic fields.

Graphical abstract: Low-dimensional copper(ii) complexes triply bridged with azide/carboxylate/DMSO showing very strong ferromagnetic interaction and influence of dipolar fields at low temperatures: a quantum Monte Carlo magnetic study

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Supplementary files

Article information


Submitted
22 Oct 2007
Accepted
07 Jan 2008
First published
14 Feb 2008

Dalton Trans., 2008, 1752-1760
Article type
Paper

Low-dimensional copper(II) complexes triply bridged with azide/carboxylate/DMSO showing very strong ferromagnetic interaction and influence of dipolar fields at low temperatures: a quantum Monte Carlo magnetic study

V. Tangoulis, D. Panagoulis, C. P. Raptopoulou and C. Dendrinou-Samara, Dalton Trans., 2008, 1752
DOI: 10.1039/B716291J

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