Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.150: Poster
Tuesday, March 27, 2007, 15:00–19:00, Poster A
Molecular magnetism of metallo-supramolecular hierarchically ordered materials consisting of mixtures from different transition metal ions — •M. Lommel1, U. Pietsch1, G. Schwarz2, D. G. Kurth2, Y. Bodenthin3, W. Haase4, and Z. Tomkowicz5 — 1Institute of Physics, University of Siegen, Walter-Flex-Str 3, 57078 Siegen, Germany — 2Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany — 3Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland — 4Institute of Physical Chemistry, Petersenstrasse 20, 64287 Darmstadt — 5Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland
We use metallo-supramolecular mesophases consisting of periodic arrangements of transition metal ions tightly coupled through ditopic bis-terpyridine-ligands and embedded in an amphiphilic mesophase called polyelectrolyt-amphiphile-complex. The materials made by self-assembly of transition metal ions, ligands and amphiphilic molecules. We used temperature induced structural changes of an amphiphilic phase to deliberately manipulate the magnetic properties of tightly coupled metal ion coordination centers. Consequently, the energetic separation of the metal centered orbitals (crystal field) can change giving rise to a spin crossover. In our systems the spin-crossover is driven by the induced structural change of surrounding nitrogen-atoms around the ions. We have investigated different types of metallo-supramolecular complexes with mixtures of transition metal ions. We found that several parameters being characteristic for the spincrossover are changing non-linear as a function of the concentration of metal ions.