Solute-solute correlations in aqueous solutions of tetramethylammonium chloride

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Abstract
Neutron diffraction with hydrogen/deuterium isotope substitution on the methyl group hydrogen atoms of the solute is used to investigate the distribution of the tetramethylammonium (TMA) ion, (CH3)4N+, in aqueous solution of 4·0 molal tetramethylammonium chloride at room temperature. The centre-centre correlation function for TMA ions is calculated from the HH correlation function for the solute by deconvolution of a spherical form factor representing the distribution of methyl hydrogen atoms. The centre-centre function shows a broad distribution of TMA … TMA distances, but indicates that close contacts occur frequently. This suggests that the charge interaction of TMA is not important in determining the distribution and that the TMA ion behaves more like an apolar solute.

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