Smectic A - Smectic C* Transition in a "de Vries" Liquid Crystal by 2H NMR

Valentina Domenici (1) , Mario Cifelli (1) , Alessandro Marchetti (2, 3) , Moreno Lelli (2) , Vera Hamplova (4) , Miroslav Kaspar (4) , Carlo Alberto Veracini (1)

1 Dipartimento di Chimica e Chimica Industriale
2 ISA - Centre de RMN à très hauts champs
3 SNS - Scuola Normale Superiore di Pisa
4 FZU / CAS - Institute of Physics of the Czech Academy of Sciences

Solid State H-2 Nuclear Magnetic Resonance (NMR) spectroscopy was applied to the structural and orientational studies of a selectively labelled 'de Vries' liquid crystal compound. Measurements were performed at five values of the magnetic field, ranging from 4.70 to 18.80 T. The trend of the orientational order S and tilt angle theta of the H-2-labeled moiety in the SmA and SmC* phases at different magnetic fields confirms previous results and allows us to better characterize the SmA-SmC* transition.

Mots clés: TILT; DYNAMICS; SPECTROSCOPY; PHASES; C-13 NMR; MAGNETIC-FIELD; BANANA-SHAPED MOLECULES; Liquid crystal; de Vries; Phase transition; NMR; ORDER

Domaines: Chimie analytique

Valentina Domenici, Mario Cifelli, Alessandro Marchetti, Moreno Lelli, Vera Hamplova, et al.. Smectic A - Smectic C* Transition in a "de Vries" Liquid Crystal by 2H NMR. The 11th European Conference on Liquid Crystals (ECLC 2011), Feb 2011, Maribor, Slovenia. pp.103-110, ⟨10.1080/15421406.2011.609440⟩. ⟨hal-00699751⟩