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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
