Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 16, Pages 11193-11201Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp01389a
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Funding
- Swedish Research Council [621-2011-4336, 2015-05042]
- Linneaus grant Organising Molecular Matter [239-2009-6794]
- Lund University
- OMM grant
- Swedish Research Council [2015-05042] Funding Source: Swedish Research Council
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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.
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