Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.28: Poster
Thursday, March 19, 2020, 15:00–18:00, P3
X-ray magnetic circular dichroism measurements on SURMOF-2 structures — •Alexei Nefedov1, Kai Mueller1, Lars Heinke1, Chen Luo2, Kai Chen2, Florin Radu2, Evangelos Golias3, Wolfgang Kuch3, and Christof Woell1 — 1Karlsruhe Institute of Technology, Institute of Functional Interfaces, Eggenstein-Leopoldshafen, Germany — 2Helmholtz-Zentrum Berlin für Materialen und Energie, Berlin, Germany — 3Freie Universität Berlin, Institut für Experimentalphysik, Berlin, Germany
Metal-organic frameworks (MOFs) are crystalline self-assembled solids from metal compounds and organic ligands. Recently, it was found that quasi-linear metal-ion chains within a particular type of MOFs exhibit 1-D magnetic properties. Thus, Friedländer et al. reported on the ferromagnetic (FM) ordering in SURMOF-2 (Surface-mounted MOFs) [1]. Contrary to the bulk MOF-2 crystals, where Cu2+ ions form antiferromagnetically coupled paddlewheels, the Cu2+ ions in SURMOF-2 are connected via carboxylate groups in a zipper-like fashion. This unusual coupling of the spin-1/2 ions within the resulting 1-D chains stabilizes a low-temperature FM phase. In this study, SURMOF-2 systems (CuBDC/CuPBDC) were loaded with metalocene (manganocene and nickelocene) and their magnetic properties were investigated. The presence of the FM phase in empty SURMOF-2 systems has been confirmed with a Curie temperature of 22 K. After loading of SURMOF-2 with metalocene molecules a different behavior of magnetic properties was found. The details of these effects will be discussed. [1] Stefan Friedländer et al., Angew. Chem. Int. Ed. 2016, 55, 12683.