Enhancement of spin relaxation in an FeDy2 Fe coordination cluster by magnetic fields

Guo Peng; Valeriu Mereacre; George E Kostakis; Juliusz A Wolny; Volker Schünemann; Annie K Powell

doi:10.1002/chem.201403792

Enhancement of spin relaxation in an FeDy2 Fe coordination cluster by magnetic fields

Chemistry. 2014 Sep 22;20(39):12381-4. doi: 10.1002/chem.201403792. Epub 2014 Sep 5.

Authors

Guo Peng¹, Valeriu Mereacre, George E Kostakis, Juliusz A Wolny, Volker Schünemann, Annie K Powell

Affiliation

¹ Institute of Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe (Germany).

PMID: 25197018
DOI: 10.1002/chem.201403792

Abstract

Two [FeLn2 Fe(μ3 -OH)2 (teg)2 (N3 )2 (C6 H5 COO)4 ] compounds (where Ln=Y(III) and Dy(III) ; teg=triethylene glycol anion) have been synthesized and studied using SQUID and Mössbauer spectroscopy. The magnetic measurements on both compounds indicate dominant antiferromagnetic interactions between the metal centers. Analysis of the (57) Fe Mössbauer spectra complement the ac magnetic susceptibility measurements, which show how a static magnetic field can quench the slow relaxation of magnetization generated by the anisotropic Dy(III) ions.

Keywords: Moessbauer spectroscopy; cooperative effects; heterometallic complexes; iron; lanthanides.