Frequency-domain Fourier-transform terahertz spectroscopy of the single-molecule magnet (NEt4)[Mn2(5-Brsalen)2(MeOH)2Cr(CN)6]

Jan Dreiser; Alexander Schnegg; Karsten Holldack; Kasper S Pedersen; Magnus Schau-Magnussen; Joscha Nehrkorn; Philip Tregenna-Piggott; Hannu Mutka; Høgni Weihe; Jesper Bendix; Oliver Waldmann

doi:10.1002/chem.201100581

Frequency-domain Fourier-transform terahertz spectroscopy of the single-molecule magnet (NEt4)[Mn2(5-Brsalen)2(MeOH)2Cr(CN)6]

Chemistry. 2011 Jun 27;17(27):7492-8. doi: 10.1002/chem.201100581. Epub 2011 May 26.

Authors

Jan Dreiser¹, Alexander Schnegg, Karsten Holldack, Kasper S Pedersen, Magnus Schau-Magnussen, Joscha Nehrkorn, Philip Tregenna-Piggott, Hannu Mutka, Høgni Weihe, Jesper Bendix, Oliver Waldmann

Affiliation

¹ Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany. jan.dreiser@psi.ch

PMID: 21618631
DOI: 10.1002/chem.201100581

Abstract

We have investigated the novel single-molecule magnet (NEt(4))[Mn(2)(5-Brsalen)(2)(MeOH)(2)Cr(CN)(6)] (1; 5-Brsalen = N,N'-ethylenebis(5-bromosalicylidene)iminato anion) using spectroscopic as well as magnetization and susceptibility measurements. Frequency-domain Fourier-transform terahertz electron paramagnetic resonance (FDFT THz-EPR) based on the generation of THz radiation from a synchrotron in combination with inelastic neutron scattering (INS) allows for the discrimination between intermultiplet and intramultiplet transitions. Together with ac/dc magnetic susceptibility measurements the obtained set of data provides a complete characterization of the lowest energetic magnetic excitations. We find that the new compound 1 exhibits much weaker intermolecular interactions than found in the closely related compound: K[Mn(2)(5-Brsalen)(2)(H(2)O)(2)Cr(CN)(6)] (2). Furthermore, two phonon lines in the vicinity of the magnetic excitations are detected.