Organic ammonium salts

These compounds should be dissolvable in a clean-up solution containing a quaternary organic ammonium salt, or simply ammonium chloride [1749]. The solubilities of some selected particulate bridging agents are shown in Table 9-1. A chelating agent such as citric acid or its salts is also included in the clean-up solution. 

Similar hydrolysis reactions occur with organic ammonium salts. 

In the in-situ polymerization technique, the cations in the intergallery space of the clay are exchanged to organic ammonium salts (monomers or initiators), which leads to the expansion of the gap between the clay platelets. The in-situ polymerizations are conducted between the intercalated layers. Various different polymerization technologies were employed for preparing polymer clay... 

Xiao FS, Wang LF, Yin CY, Lin KF, Di Y, Li JX, Xu RR, Su DS, Schlogl R, Yokoi T, Tatsumi T (2006) Catalytic properties of hierarchical mesoporous zeolites templated with a mixture of small organic ammonium salts and mesoscale cationic polymers. Angew Chem Int Ed 45 3090-3093... 

Association constants between simple organic ammonium salts and 18-crown-6 ether in CDCI3 at 25°C are on the order of 10 M" corresponding to a AG° of complexation of about -33.5 kJ/mol (-8 kcal/mol). 

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