Synthesis of a novel antiferroelectric liquid crystal with high Ps

Induced Smectic-G Phase through Intermolecular Hydrogen Bonding, Part XII: Thermal and Phase Behaviour of p-aminobenzonitrile: p-n-alkoxybenzoic acids

“…This observation provides substantial evidence towards the effective role of the non-mesogenic moiety, ABN, on the phase behaviour of the present series. It is worth mentioning that the thermal distribution of induced smectic-G phase in the reported series derived from palkoxybenzoates [19,20] shows a non-uniform trend. This, however, confirms the significant contribution of the p-aminobenzonitrile moiety to the phase behaviour of the present series.…”

“…In continuation of our systematic investigation of Hbonded liquid crystals comprising different proton and acceptor groups [19][20][21][22][23], the present communication deals with the synthesis and phase behaviour of a new series of liquid crystalline systems involving intermolecular hydrogen bonding between p-n-alkoxybenzoic acids (nABA) and p-aminobenzonitrile (ABN). The molecular structure of the ABN:nABA series is represented in Figure 1.…”

“…In fact, it has been widely accepted that the proton donor and acceptor capabilities of the atoms of the functional groups involved in the hydrogen bonding contribute remarkably to the occurrence of new phases and their thermal stability. Despite their low bond activation energies, these non-covalent interactions show a profound impact on thermal and physical properties such as melting points, heats of vaporization, mesomorphic behaviour, etc.In continuation of our systematic investigation of Hbonded liquid crystals comprising different proton and acceptor groups [19][20][21][22][23], the present communication deals with the synthesis and phase behaviour of a new series of liquid crystalline systems involving intermolecular hydrogen bonding between p-n-alkoxybenzoic acids (nABA) and p-aminobenzonitrile (ABN). The molecular structure of the ABN:nABA series is represented in Figure 1.…”

Experimental evidence of an optical shutter in cholesteric phase of a double hydrogen bonded liquid crystal

“…In the case of HBLCs the molecular frame possesses [10,[18][19][20][21][22] additional soft-covalent interaction. Further, in case of non-ferroelectric and ferroelectric HBLCs, the observed [13,21] variation in device relevant properties like thermal stability, spontaneous polarization, tilt angle, switching times etc., are addressed through dipolar and refined dipolar models to vouch the fact that soft-covalent interaction extends rather inclined to the long molecular dipole moment.…”

Induced Crystal-G Phase through Intermolecular Hydrogen Bonding Part XIV: Influence of Alkyl Carbons of p-Hydroxybenzoates on Phase Distribution of Induced Phase

“…Supramolecular liquid crystalline complexes resulting from these non-covalent interactions of either mesomorphic or nonmesomorphic components are reported (BENHARDT et al 1998;KATO et al 1995;WILSON et al 1995;YU et al 1991) and in fact, the induction of new phases in the systems involving a non-mesogen is attributed, without ambiguity, to the presence of intermolecular hydrogen bonding. As a part of our systematic investigations on supramolecular H-bonded liquid crystals (KUMAR et al 1998;SWATHI et al 2000;SWATHI et al 2001a;2001b;SRINIVASULU et al 2000;SRINIVASULU et al 2001;KUMAR et al 2002) the present communication deals with synthesis and phase behaviour of two novel series of liquid crystalline complexes involving mesogenic p-n-alkoxybenzoic acids (n = 3 to 10 and 12) and non-mesogenic ethylp-hydroxybenzoate ( EHB) and propyl-p-hydroxybenzoate (PHB) namely, ethyl-phydroxybenzoate: p-n-alkoxybenzoic acids (EHB:nABA) and propyl-p-hydroxybenzoate: p-nalkoxybenzoic acids (PHB:nABA) (Figure 1). The results are discussed in conjunction with the phase behaviour of p-n-alkoxybenzoic acids.…”