Induced crystal G phase through intermolecular hydrogen bonding II. Influence of alkyl chain length of n-alkyl p-hydroxybenzoates on thermal and phase behaviour

Phase Transition Studies in Liquid Crystals across I-N and N-ScPhases in Alkoxy Benzoic Acids – Density Measurements

“…The transition temperatures from dilatometric studies (Table 1) are reasonably in good agreement with those reported in literature [12] and values supplied by the company. The estimated molar volume (molecular weight=density) in the isotropic phase per an increment of methylene unit estimated at T (INþ5) is in the range of 15.99 Â 10 À6 m 3 Á mol À1 and agrees with the literature data available on nO.m compounds and the values reported for the normal liquids [1,13,14] whose values vary between 15 to 17 Â 10 À6 m 3 Á mol À1 .…”

“…The lower homologues with n ¼ 3 to 6 exhibit only nematic phase while higher n value compound with n ¼ 7 to 12 and 16 exhibit smectic-C phase along with the nematic phase. These compounds form a family which has been extensively studied as they form inter and intra molecular hydrogen bonding [8][9][10][11][12] …”

Probing the Texture of the Calamitic Liquid Crystalline Dimer of 4-(4-Pentenyloxy)benzoic Acid

“…The carboxylic acid dimer is formed via hydrogen bonding (Figure 3) [13]. This is supported by IR spectra analysis in which the carbonyl group in the dimer has a characteristic band at 1680 cm -1 [13,29], a significant shift from that of the free acid.…”

Enhancing proton conduction via doping of supramolecular liquid crystals (4-alkoxybenzoic acids) with imidazole

“…4-Alkoxybenzoic acids (nAOBA) have long been known as hydrogen-bonded supramolecular liquid crystals [13][14][15]. The dynamically ordered hydrogen bonds in the mesomorphic nAOBA provide potential pathways for proton conduction.…”