caa a22 4500 605545723 CHVBK 20210128100937.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00723-014-0630-7 doi (NATIONALLICENCE)springer-10.1007/s00723-014-0630-7 Magnetic Anisotropy of Cr(III) Ions in Polymeric Oxalate Complexes as Revealed by HF-ESR Spectroscopy [Elektronische Daten] [Dijana Žilić, Lidija Androš, Yulia Krupskaya, Vladislav Kataev, Bernd Büchner] 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 83-332GHz in magnetic fields up to 16T, the spin-Hamiltonian parameters, $$g$$ g , $$D$$ D and $$E$$ E , have been obtained. Both chromium complexes have a small negative (easy axis) magnetic anisotropy $$|D|<1$$ | D | < 1 K. CrPhen complex is biaxial, i.e., besides axial $$D$$ D , there is also significant rhombic zero-field splitting (ZFS) parameter, $$E$$ 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. Springer-Verlag Wien, 2015 Žilić Dijana Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut Androš Lidija Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia aut Krupskaya Yulia Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut Kataev Vladislav Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut Büchner Bernd Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut Applied Magnetic Resonance Springer Vienna 46/3(2015-03-01), 309-321 0937-9347 46:3<309 2015 46 723 https://doi.org/10.1007/s00723-014-0630-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00723-014-0630-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Žilić Dijana Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut NATIONALLICENCE 700 1- Androš Lidija Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia aut NATIONALLICENCE 700 1- Krupskaya Yulia Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut NATIONALLICENCE 700 1- Kataev Vladislav Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut NATIONALLICENCE 700 1- Büchner Bernd Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, D-01069, Dresden, Germany aut NATIONALLICENCE 773 0- Applied Magnetic Resonance Springer Vienna 46/3(2015-03-01), 309-321 0937-9347 46:3<309 2015 46 723