Advanced Materials and Devices for Nanotechnology
Systems with switchable domains on the molecular or supramolecular level on a nanoscopic or mesoscopic scale. One goal is to enable a highly efficient information storage and conductor. Towards this end, a promising and challenging field is the study of compounds with electronic multistability. A considerable interest is devoted to materials containing transition metals and exhibiting appealing properties of molecular bistability.
Nanoscopic Supramolecular Sensors for Extraterrestrial Application:
Adsorbate-Induced-Multi-Stability (AIMS Effect)
Size, Shape and PES selective detection of molecules from the gas phase, such as an atmosphere of a planet.
- for the next NASA mars mission in 2003 (Athena rover).
- industrial application
- New Molecular Sensors allow to use the Moessbauer Effect as Hygrometer
F. Renz, P.A. de Souza Jr., G. Klingelhöfer, H.A. Goodwin, P. Gütlich
ISIAME, Book of Abstracts, Norfolk, Virginia, USA, 13.-18.8.2000.
- Molecular Sensors for Terrestrial and Extraterrestrial Application
F. Renz, P.A. de Souza Jr., G. Klingelhöfer, H.A. Goodwin, P. Gütlich
ICMM, San Antonio, Texas, USA, 2000.
- New Molecular Sensors allow to use the Moessbauer Effect as Hygrometer
Strong-Field-Light-Induced-Excited-Spin-State-Trapping (SF-LIESST Effect)
(supramolecular optically switchable transition-metal-complexes; discovered in 1999)
- Photophysics, Photochemistry
- Optical storage and switch
Light-Perturbed-Thermal-Hysteresis (LiPTH-Effect)
(optically switchable transition-metal-complexes)
- Photophysics, Photochemistry
- Optical storage and molecular switching at room temperature
- LIGHT PERTURBED HYSTERESIS IN AN IRON(II) SPIN-CROSSOVER COMPOUND OBSERVED BY THE MÖSSBAUER EFFECT
F. Renz, H. Spiering, H. A. Goodwin, P. Gütlich
Int. Conf. on the Application of the Moessbauer Effect (ICAME 99) , Garmisch Partenkirchen, Germany, 29.8-3.9.1999.
- LIESST, LITH, AND LiPTH IN [FeL](BF4)2 COMPLEXES
(L = Hexa(ptz), Bis(phy))
F. Renz, H. Spiering, P.-M. Anglade, H. A. Goodwin, P. Gütlich
TOSS, Leiden, Netherlands, 2000.
- LIGHT PERTURBED HYSTERESIS IN AN IRON(II) SPIN-CROSSOVER COMPOUND OBSERVED BY THE MÖSSBAUER EFFECT
- Light-perturbed hysteresis in an iron(II) spin-crossover compound observed by the Moessbauer effect
F. Renz, H. Spiering, H.A.Goodwin, P. Gütlich
Hyperfine Interactions 2000, 126, 155-158
Thermally induced spin crossover (TISC)
(thermally switchable transition-metal-complexes; discovered in iron(ii) componds in 1964) Transition between a Low Spin and a High Spin State in Solid and Liquid State
- Influenced by:
- Ligand
- Anion
- Crystallsolvents
- Formation of mixed crystals
- Isotope-effekt
- Pressure
- Magnetic fields
- Sensors
- Theoretical Models
Pressure induced spin crossover (PISC)
(pressure induced switchable transition-metal-complexes;
discovered in iron(ii) compounds around 1970)
Transition between a Low Spin and a High Spin State in Solid and Liquid State
- Influenced by:
- Ligand
- Anion
- Crystallsolvents
- Formation of mixed crystals
- Isotope-effekt
- Pressure
- Magnetic fields
- Sensors
Light-Induced-Spin-State-Trapping (LIESST-Effect)
(optically switschable transition-metal-complexes; discovered in iron(II) in 1984)
- Photophysics, Photochemistry
- X-RAY STUDY OF THE LIGHT-INDUCED META-STABLE STATES OF A SPIN CROSSOVER COMPOUND
J. Kusz, F. Renz, H. Spiering, P. Gütlich.
TOSS, Leiden, Netherlands, 2000. - LIESST, LITH, AND LiPTH IN [FeL](BF4)2 COMPLEXES
(L = Hexa(ptz), Bis(phy))
F. Renz, H. Spiering, P.-M. Anglade, H. A. Goodwin, P. Gütlich
TOSS, Leiden, Netherlands, 2000.
- X-RAY STUDY OF THE LIGHT-INDUCED META-STABLE STATES OF A SPIN CROSSOVER COMPOUND
- Optical storage and switch
- Kinetics of relaxation
- Photorefractive properties
Light-Induced-Thermal-Hysteresis (LITH-Effect)
(optically switschable transition-metal-complexes)
- Photophysics, Photochemistry
- Optical storage and switch
- LIESST, LITH, AND LiPTH IN [FeL](BF4)2 COMPLEXES
(L = Hexa(ptz), Bis(phy))
F. Renz, H. Spiering, P.-M. Anglade, H. A. Goodwin, P. Gütlich
TOSS, Leiden, Netherlands, 2000.
- LIESST, LITH, AND LiPTH IN [FeL](BF4)2 COMPLEXES
Molecular orbital- and ligandfield calculations for molecular spectroscopy
- Electronic states
- Optical and magnetical properties of transition-metal-complexes
Multinuclear-transition-metal-complexes with exchange interaction
Binuclear transition-metal-complexes
- Paramagnetic to antiferromagnetic-coupled transition (pressure, light)
- DIRECT MONITORING OF SPIN STATE AND MAGNETIC COUPLING IN BINUCLEAR COMPOUNDS
Vadim Ksenofontov, Hartmut Spiering, Franz Renz, Ana B. Gaspar, Jose Antonio Real and Philipp Gütlich
TOSS, Leiden, Netherlands, 2000. - LITH-effect
- LiPTH-effect
Multinuclear mixed-valence transition-metal-complexes
- Valence-fluctuation