Alkylammonium transport

Recently, the abilities of primary to tertiary alkylammonium ions with Me, Et, and -Bu groups to transport water to NB have been studied [48]. As the result of careful consideration of the ion-pair formation, it has been shown that the hydration numbers (w ) of the ammonium ions in NB, being little affected by the alkyl chain length, are simply dependent on the class of the ammonium ion % = 1.64, 1.04, 0.66, respectively, for the primary, secondary, and tertiary ammonium ions. 

Apart from alkali metal cations [18]crown-6 derivatives can complex and transport primary alkylammonium cations across chloroform membranes <80JCR(S)136). This process is particularly relevant as many amines (e.g. amphetamine) are physiologically important species. 

Figure 15 Determination of the rate constants kj and kj of the transport of homologous quaternary alkylammonium bromides in a three-compartment model system. Water/n-octanol/water system (upper diagram) and time dependence of substance concentrations in the different compartments after different times t (lower diagram) (reproduced from Figures 1 and 4 of ref. [443] with permission from Editio Cantor Verlag GmbH, Aulendorf, Germany).

Lampreia MI, BarreiraF (1976) Transport properties of molten tetra-alkylammonium picrates. 

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