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Magneto-Structural Correlations in Oxalate-Bridged Sr(II)Cr(III) Coordination Polymers: Structure, Magnetization, X-band and High-Field ESR studies

Abstract

Results of the high-field electron spin resonance (HF-ESR) spectroscopy on the title 1D coordination polymers at frequencies up to 415 GHz, supported by X-ray, thermal, magnetic susceptibility and X-band (10 GHz) ESR studies, are presented. The heterometallic compounds {SrCr2(phen)2(C2O4)4}·H2O (SrCrPhen) and {SrCr2(bpy)2(C2O4)4(H2O)}·5H2O (SrCrBpy) (phen = 1,10-phenanthroline, bpy = 2,2’-bipyridine) were synthesized. Structural analysis reveals double oxalate-bridged zigzag Sr-Cr chains while magnetic susceptibility study shows paramagnetic behaviour of the complexes. HF-ESR spectroscopy data were analysed with a relevant spin-Hamiltonian yielding the g, D and E parameters of the Cr(III) ions. Both complexes show small magnetic easy-axis type anisotropy with |D|~1 K; SrCrBpy has uniaxial while SrCrPhen has biaxial anisotropy. HF-ESR study has enabled to establish rational magneto-structural correlations and revealed significant differences between very similar crystal structures. Additionally, the ability of SrCrPhen and SrCrBpy to be single-source precursors for the formation of Sr-Cr oxides was investigated.

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Publication details

The article was received on 08 Dec 2017, accepted on 10 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7DT04655C
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Magneto-Structural Correlations in Oxalate-Bridged Sr(II)Cr(III) Coordination Polymers: Structure, Magnetization, X-band and High-Field ESR studies

    L. Androš Dubraja, M. Juric, J. Popović, D. Pajić, Y. Krupskaya, V. Kataev, B. Büchner and D. Žilić, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT04655C

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