Structure and Properties of New de Vries SmA∗ Liquid Crystals
Journal article, 2004

We synthesized a chiral mesogen AC11 and two different siloxanes MSi2-AC11 and DSi3-AC11 derived from it by a hydrosilylation reaction. The effects of varying the molecular architecture were investigated with special attention being devoted to the occurrence of the de Vries SmA* phase. Strong hints that all the three molecules follow the scenario suggested by de Vries were found in the behavior of the susceptibility by studies of their electrooptical response in the SmA* phase. In particular DSi3-AC11 containing two mesogens interconnected by a siloxane spacer presented a critical exponent gamma as high as 1.97, indicating a practically pure de Vries behavior Temperature-dependent X-ray analysis revealed that the three materials underwent a small layer shrinkage at the SmA*-SmC* transition.

smectic A

siloxane liquid crystal

phase structure


de Vries


M. Reihmann

University of Pisa

A. Crudeli

University of Pisa

C. Blanc

University of Montpellier

V. Lorman

University of Montpellier

Y. P. Panarin

Dublin Institute of Technology (DIT)

Trinity College Dublin

J. K. Vij

Trinity College Dublin

Nils Olsson

Chalmers, Department of Chemical Engineering and Environmental Sciences

G. Galli

University of Pisa


0015-0193 (ISSN)

Vol. 309 111-119

Subject Categories

Other Engineering and Technologies not elsewhere specified

Materials Chemistry

Other Materials Engineering

Organic Chemistry



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