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

Dalton Transactions : an International Journal of Inorganic Chemistry
Lidija Androš DubrajaDijana Žilić

Abstract

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 {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 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.

References

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Nov 14, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Marijana JurićJasminka Popović
Nov 21, 2015·Chemical Communications : Chem Comm·Yi-Fei DengYan-Zhen Zheng
Mar 18, 2017·Inorganic Chemistry·Jasminka PopovićJelena Habjanič
Aug 23, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Lidija Androš DubrajaDamir Pajić

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Citations

Aug 7, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Tamires S FernandesDanielle Cangussu

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Methods Mentioned

BETA
electron spin resonance
ESR
X-ray
thermal treatment

Software Mentioned

CrysAlis PRO
ORTEP
CoSyM Calculators
AFIX
Mercury
VESTA
EasySpin
WinGX
SHELXL
PLATON

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