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A Neutron Scattering and Modelling Study of Aqueous Solutions of Tetramethylammonium and Tetrapropylammonium Bromide

A Neutron Scattering and Modelling Study of Aqueous Solutions of Tetramethylammonium and Tetrapropylammonium Bromide

Emelie J Nilsson, Viveka Alfredsson, Daniel T Bowron, Karen J Edler

Phys Chem Chem Phys. 2016 Apr 28;18(16):11193-201.

PMID: 27051995

Abstract:

We have investigated the properties in water of two tetraalkylammonium bromides (tetramethylammonium, TMA(+), and tetrapropylammonium, TPA(+)), at 0.4 M, using neutron scattering coupled with empirical potential structure refinement to arrive at an atomistic description. Having both a polar and an apolar moiety, it is of interest to determine the strength of each moiety as a function of the alkyl chain length. TMA(+) and TPA(+), having different impact as structure directors in zeolite synthesis, were chosen for this study. Water arranges tetrahedrally around TMA(+) and in an almost featureless manner around TPA(+). TMA(+) and TPA(+) show an apolar hydration with TPA(+) being slightly more apolar. TPA(+) has a tendency to form small clusters of 2-4 molecules and to fold into a compact configuration. Both molecules correlate similarly with the bromide ion but do not dissociate completely at this concentration.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1941306	Tetrapropylammonium bromide		1941-30-6	Price

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