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

Autori
Androš Dubraja, Lidija ; Jurić, Marijana ; Popović, Jasminka ; Pajić, Damir ; Krupskaya, Yulia ; Kataev, Vladislav ; Bűchner, Bernd ; Žilić, Dijana

Izvornik
Dalton transactions (1477-9226) 47 (2018), 11; 3992-4000

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
High field ESR ; Magnetic anisotropy ; Zero-field splitting

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA