Evidence for a new ferroelectric switching liquid crystalline phase formed by a carbosilane based dendrimer with banana-shaped mesogenic units.
The first carbosilane dendrimer with peripheral bent-core mesogenic units is reported. This material forms a liquid crystalline phase which is stable over a wide temperature range and forms an LC glass on cooling. Polarizing microscopy, X-ray diffraction, and dielectric and electrooptic investigations reveal the presence of a novel liquid crystalline phase, in which the molecules are tilted and adapt a polar order within the layers, but without long-range correlation between the layers. By applying external electric fields, switching into a ferroelectric organization can be achieved. Once formed the ferroelectric states are stable and can be switched between the different polarization states.
Dantlgraber
Gert
G
Department of Chemistry, Martin-Luther University Halle-Wittenberg, Institute of Organic Chemistry, Kurt-Mothes Strasse 2, D-06120 Halle, Germany.
Baumeister
Ute
U
Diele
Siegmar
S
Kresse
Horst
H
Lühmann
Bettina
B
Lang
Heinrich
H
Tschierske
Carsten
C