91577-92-3Relevant academic research and scientific papers
o-Carborane derivatives for probing molecular polarity effects on liquid crystal phase stability and dielectric behavior
Pecyna, Jacek,Jankowiak, Aleksandra,Pociecha, Damian,Kaszyński, Piotr
, p. 11412 - 11422 (2015/11/11)
A series of mesogenic derivatives of o-carborane was synthesized, their properties were analyzed by thermal, optical and XRD methods, and results were compared with those of isostructural p-carborane and benzene analogues. Comparative analysis revealed lower nematic phase stability and enhanced smectic behavior, including SmC, in the o-carborane derivatives relative to the isosteric p-carborane analogues. The effect of o-carborane on the electrooptical properties was assessed for biphenyl derivative 1[B]a in the 6CHBT nematic host giving the extrapolated Δε = 11.0, and a moderate increase of the elastic constants Kii. Complete analysis of the dielectric results for o-carborane and p-carborane analogues 1[B]a and 1[A]a was performed using the Maier-Meier formalism augmented by DFT computational methods.
New LMM organosiloxanes with photoisomerising azo groups
Newton,Walton,Coles,Hodge
, p. 107 - 125 (2007/10/02)
A new LMM photo-reactive chiral azo-containing organosiloxane (C10Azo*B) and its racemic analogue (C10Azo(±)B) have been synthesised and their mesomorphic properties investigated. The materials are denoted C10Az
Synthesis and Optical Properties of New Ferroelectric Liquid Crystals: (S)-(+)-Methyl-2-butyl--4-aminobenzoate and (S)-(+)-Methyl-2-butyl--4-aminobenzoate
Merlo, Aloir,Gallardo, Hugo,Taylor, T. R.,Kroin, Teodosio
, p. 31 - 40 (2007/10/02)
Four members of (S)-(+)-Methyl-2-butyl--4-aminobenzoate (Series I) and four members of (S)-(+)-Methyl-2-butyl--4-aminobenzoate (Series II) were synthesized.Both series show chole
Chiral Mesogenic Compounds: Carbocyclic and Heterocyclic Schiff Bases
Barbera, J.,Melendez, E.,Serrano, J. L.,Sierra, M. T.,Ezcurra, A.,Jubindo, M. A. Perez
, p. 151 - 158 (2007/10/02)
Five different chiral p-substituted anilines derived from 4-aminobenzoic acid and from 4-aminophenol were condensed with four carbocyclic and heterocyclic aldehydes in order to obtain chiral Schiff bases resembling DOBAMBC and HOBACPC.With the exception of the pyridine-3-carboxaldehyde derivatives, the compounds are mesomorphic.Some of the compounds exhibit ferroelectric SC* phases, and all exhibit SA or Ch mesophases on heating.Benzaldehyde and pyridine-2-carboxaldehyde derivatives show similar mesomorphic behavior, as was to be expected from MNDO semiempirical calculations.Values of the spontaneous polarization of certain compounds were measured.
