Bayreuth 1998 – wissenschaftliches Programm
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CP: Chemische Physik
CP 10: Dynamik molekularer Systeme
CP 10.1: Poster
Dienstag, 10. März 1998, 18:00–20:00, P1
Structural phase transitions and molecular dynamics in organosilicon molecular crystals: A solid state NMR spectroscopic investigation — •Stephan Dusold, Jörg Kümmerlen, and Angelika Sebald — Bayerisches Geoinstitut, Universität Bayreuth
Solid state NMR spectroscopy is a powerful tool for the elucidation of both
the structure and the dynamics of molecules in the solid state. A wide
variety of one- and multidimensional NMR experiments are available to
directly investigate reorientational processes with rate constants ranging
from 10−1 to 104 s−1.
The transition from an ordered to a disordered phase is often associated
with changes in either the molecular/crystal packing and/or the dynamics
of inter- or intramolecular reorientation. In all these cases high
resolution solid state NMR spectroscopy can provide direct insight into the
phase transition at a molecular level. Here we present results from a
13C and 29Si variable temperature CP/MAS NMR investigation
on phase transitions and molecular dynamics in organosilicon compounds
Si2R6 with bulky to very bulky substituents R, such
as R = tert.−Bu, SiMe3.