title: Magnetic circular dichroism of peralkylated tetrasilane conformers.
abstract: Magnetic circular dichroism (MCD) of five peralkylated tetrasilanes (1-5) conformationally constrained to angles ranging from nearly 0 degrees to 180 degrees and of the open chain tetrasilane Si(4)Me(10) (6) shows a clear conformational dependence and permits the detection of previously hidden transitions. In the tetrasilane CH(2)Si(4)Me(8) (1), with the smallest dihedral angle, comparison of MCD with absorption spectra reveals four low-energy electronic transitions. In the tetrasilanes 2-4, three distinct transitions are apparent. In tetrasilanes 5 and 6, MCD reveals the very weak transition that has been predicted to be buried under the first intense peak and to which the anomalous thermochromism of 6 and other short-chain oligosilanes has been attributed.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215, USA.
authors.forename: Heather A
authors.initials: HA
authors.lastname: Fogarty
authors.forename: Roman
authors.initials: R
authors.lastname: Imhof
authors.forename: Josef
authors.initials: J
authors.lastname: Michl