An Infrared Spectroscopic Study of p-n-Alkoxybenzoic Acids

An FT-IR spectroscopic study of the role of hydrogen bonding in the formation of liquid crystallinity for mixtures containing bipyridines and 4-pentoxybenzoic acid

“…However, the presence of open dimers and catemer-like strands, see Fig. 8, stabilises the layered arrangements and hence, strongly promotes smectic phases, 67,68 see Fig. 14.…”

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

“…However, on heating from the crystalline solid a reversible transition to a disordered, or ''soft'' crystal phase (SCr) was seen prior to clearing. In order to first predict virtual mesogenic behaviour for the chiral acid, and also assess the effects of a chiral branch on the liquid crystallinity of supramolecular systems, binary mixtures of the nematogenic non-chiral 4OBA 29,30 and chiral (S)-(2-Me)4OBA were prepared and their thermal behaviour is summarised in Table 2 along with those of the pure acids. For all mixtures containing chiral acid, the chiral nematic phase was seen in place of the conventional nematic, identifiable by its characteristic oily streak texture, shown in Fig.…”

X-ray crystal structure analysis of 4,7-dioxononanoic acid

“…Lowering of IR carbonyl stretching absorption frequencies in the solid-state due to strengthened electrostatic interactions as a consequence of crystal packing has been documented (Etter, 1976;Painter et al, 2000). Although keto carbonyl groups and the carboxyl carbonyl groups interact independently of each other and should give two distinct stretching absorption frequencies in the IR spectrum, there appears to be a fortuitous overlap of the two stretching absorption frequencies.…”