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Issue 8, 2007
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A comparison of different methods for fitting susceptibility data of cobalt(II) coordination polymers in a new cobalt(II)/sulfate 1-D chain

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Abstract

The 1-D chain polymer [{Co(μ-SO4)L3}n] (L = 3{5}-tert-butylpyrazole) was prepared by the reaction of CoSO4·7H2O with 3 equiv. of L in MeOH. The complex contains trigonal bipyramidal cobalt(II) centres with two axial O,O′-bridging sulfato ligands. The resultant linear chains are arranged into an approximately hexagonal array, the molecules being well-separated from each other by a honeycomb of interdigitated tert-butyl groups. Susceptibility data from [{Co(μ-SO4)L3}n] are consistent with an antiferromagnetic Curie–Weiss chain, which could be well-interpreted using Heisenberg 1-D treatments. Three approaches to model these data were studied to try and separate superexchange and zero-field splitting effects. A recently proposed empirical approach gave g and J values in excellent agreement with a S = [fraction three-over-two] Heisenberg chain model, as long as the latter was performed using only high temperature data, which are not affected by zero-field splitting.

Graphical abstract: A comparison of different methods for fitting susceptibility data of cobalt(ii) coordination polymers in a new cobalt(ii)/sulfate 1-D chain

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Publication details

The article was received on 22 Jan 2007, accepted on 02 May 2007 and first published on 06 Jun 2007


Article type: Paper
DOI: 10.1039/B700987A
Citation: New J. Chem., 2007,31, 1530-1534
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    A comparison of different methods for fitting susceptibility data of cobalt(II) coordination polymers in a new cobalt(II)/sulfate 1-D chain

    L. F. Jones, C. A. Kilner and M. A. Halcrow, New J. Chem., 2007, 31, 1530
    DOI: 10.1039/B700987A

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