Abstract of Publication No. 325
Ralph Schenker, Høgni
Weihe and H. U. Güdel
Double exchange in the charge-transfer states of
[Cr2(OH)3(tmtame)2]3+
Chem. Phys. Lett. 303, 229-234 (1999)
Abstract:
The exchange splittings in the ground and ligand-to-metal charge transfer (LMCT)
states of the dimer
[Cr2(OH)3(tmtame)2]3+
(tmtame=1,1,1¯tris(aminomethyl)ethane) are derived from optical
absorption spectroscopy. The ground-state splitting is antiferromagnetic,
whereas the energy ordering of the lowest observed LMCT states is ferromagnetic.
This is a new situation. It is due to the dominant direct interactions between
metal-centered orbitals, which leads to a double-exchange situation in the LMCT
electron configurations.
Last
modified:
13.12.11 by
Gabriela Frei 