Benzoic acid , molecular associations

Hence benzoic acid forms bi-molecular associates in benzene solution. 

The use of chiral H-bonding components yields stable chiral phases by molecular association [35-37]. For example, a ferroelectric phase derived from a chiral smectic C phase can be induced by the self-assembly of nonferro-electric molecules [35-37]. Complex 11 (n = 8) exhibits a chiral smectic phase from 109 to 123 °C [35]. In this case, the H-bonded mesogen consists of nonmesomorphic chiral benzoic acid and a stilhazole that shows a very narrow temperature range of ordered smectic phases. The value of spontaneous polarization for 11 at 115 °C is 33.0 nC/cm. When the oxygen in the alkoxy... 

X—H - Y. Hydrogen bonds result in molecular association. NH3, H2O and HF have much higher boiling points and heats of vaporization than the corresponding homologues PH3, H2S and HCl. Carboxylic acids such as acetic or benzoic acids are present as dimers with the configuration... 

Not all polyoxyethylene association complexes form by one-to-one complexation. The polyoxyethylene/p-hydroxy-benzoic acid-formaldehyde copolymer complex in methanol has been reported to form by stepwise complexation (120,121). Uncertainty regarding the type of complexation may be due to changes in molecular weight distribution via partial fractionation that occurs during the complexation process (122). 

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