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Magnetic anisotropy of Cr(III) ions in polymeric oxalate complexes as revealed by HF-ESR spectroscopy

Žilić, Dijana; Androš, Lidija; Krupskaya, Yulia; Kataev, Vladislav; Büchner, Bernd (2015) Magnetic anisotropy of Cr(III) ions in polymeric oxalate complexes as revealed by HF-ESR spectroscopy. Applied Magnetic Resonance, 46 (3). pp. 309-321. ISSN 0937-9347

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Abstract

Two new Cr(III) paramagnetic polymeric complexes: {; ; [CaCr2(phen)2(C2O4)4]·0.33H2O}; ; n (CrPhen) and {; ; [CaCr2(bpy)2(C2O4)4]·0.83H2O}; ; n (CrBpy), where phen = 1, 10-phenanthroline and bpy = 2, 2′-bipyridine, have been studied by high field-high frequency electron spin resonance (HF-ESR) spectroscopy. From the oriented powder spectra, recorded in the frequency range 83−332 GHz in magnetic fields up to 16 T, the spin-Hamiltonian parameters, g, D and E, have been obtained. Both chromium complexes have a small negative (easy axis) magnetic anisotropy |D| < 1 K. CrPhen complex is biaxial, i.e. besides axial D, there is also significant rhombic zero-field splitting (ZFS) parameter, E. Contrary to CrPhen, CrBpy complex is uniaxial, but described by two sets of axial ZFS parameters. Despite very similar crystallographic structures of both complexes, HF-ESR spectroscopy resolved the existence of two magnetically inequivalent Cr(III)ions in CrBpy complex. The results fully support the earlier X-ray, SQUID magnetization and powder X-band ESR studies.

Item Type: Article
Uncontrolled Keywords: Cr(III); metal-organic complex; EPR; ESR; high field; high frequency; magnetic anisotropy; zero-field splitting
Subjects: NATURAL SCIENCES > Physics > Condensed Matter Physics
NATURAL SCIENCES > Chemistry > Inorganic Chemistry
Divisions: Division of Materials Chemistry
Division of Physical Chemistry
Projects:
Project titleProject leaderProject codeProject type
Višenuklearni metalni sustavi: sinteza i svojstva-Berislav Perić098-0982904-2946MZOS
Molekulska struktura i dinamika sustava s paramagnetskim česticama-Marina Ilakovac-Kveder098-0982915-2939MZOS
Istraživanje molekulskih magneta (polinuklearnih kompleksa prijelaznih metala) HF-EPR spektroskopijom -Dijana ŽilićPD-02.03/164HRZZ
Depositing User: Dijana Žilić
Date Deposited: 14 Feb 2017 11:50
Last Modified: 14 Feb 2017 11:50
URI: http://fulir.irb.hr/id/eprint/3376
DOI: 10.1007/s00723-014-0630-7

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