Abstracts 1999

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)      Full Text (PDF)      DOI-Link     

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=1,1,1tris(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.

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