Magneto-structural correlations in oxalate-bridged Sr()Cr() coordination polymers: structure, magnetization, X-band, and high-field ESR studies

The results of high-field electron spin resonance (HF-ESR) spectroscopy on the title 1D coordination polymers at frequencies up to 415 GHz, supported by X-ray diffraction, thermal, magnetic susceptibility, and X-band (10 GHz) ESR studies, are presented. The heterometallic compounds {SrCr 2 (phen) 2...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2018-03, Vol.47 (11), p.3992-4
Main Authors: Androš Dubraja, L, Juri, M, Popovi, J, Paji, D, Krupskaya, Y, Kataev, V, B chner, B, ili, D
Format: Article
Language:English
Subjects:
Anisotropy
Coordination polymers
Crystal structure
Electron paramagnetic resonance
Electron spin
Magnetic permeability
Polymers
Spectrum analysis
Spin resonance
Structural analysis
Superhigh frequencies
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Summary:The results of high-field electron spin resonance (HF-ESR) spectroscopy on the title 1D coordination polymers at frequencies up to 415 GHz, supported by X-ray diffraction, thermal, magnetic susceptibility, and X-band (10 GHz) ESR studies, are presented. The heterometallic compounds {SrCr 2 (phen) 2 (C 2 O 4 ) 4 }·H 2 O (SrCrPhen) and {SrCr 2 (bpy) 2 (C 2 O 4 ) 4 (H 2 O)}·5H 2 O (SrCrBpy) (phen = 1,10-phenanthroline, bpy = 2,2′-bipyridine) were synthesized. Structural analysis revealed double oxalate-bridged zigzag Sr-Cr chains while magnetic susceptibility studies showed 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 showed small magnetic easy-axis type anisotropy with | D | ∼ 1 K; SrCrBpy has uniaxial anisotropy while SrCrPhen has biaxial anisotropy. HF-ESR studies have enabled us 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. Magneto-structural correlations in 1D oxalate-bridged Sr( ii )Cr( iii ) coordination polymers with two crystallographically and magnetically non-equivalent Cr( iii ) ions are studied by HF-ESR spectroscopy.
ISSN:1477-9226
1477-9234
DOI:10.1039/c7dt04655c