Abstract
Abstract The investigation relates to density, viscosity, and conductance studies of four linear quaternary ammonium bromides with molecular weights ranging from 680 to 11,000. Of these, the two DMF-soluble compounds had their backbone quaternary centers attached to bulky substituents outside the chain and the other two, which dissolved in water, involved heterocyclic ring nitrogens carrying the positive charges in the repeating unit of the chain. Attempts have been made to comprehend the behavior of individual systems in terms of the competing solvophobic and electrostrictional interactions with the media. Concepts based on spatial disposition of the substituents and their ability to provide “pockets” for possible solvent entrapment and migration of electrostricted solvent molecules as well as formation of a “cage” of hydrogen-bonded waters around the backbone of the chain have been invoked to explain the characteristics of specific systems at the temperature(s) studied.
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