Tetramethylammonium-sodalite

C. Baerloch and W.M. Meier, Synthesis and Crystal Structure of Tetramethylammonium Sodalite. Helv. Chim. Acta, 1969, 52, 1853-1860. 

Inelastic and quasielastic neutron scattering have special advantages for studying certain of the motional properties of protonated or organic species within zeolites and related microporous materials. These advantages and various experimental methods are outlined, and illustrated by measurements of torsional vibrations and rotational diffusion of tetramethylammonium (TMA) cations occluded within zeolites TMA-sodalite, omega, ZK-4 and S APO-20. 

In the search for zeolites with new pore dimensions and channel structure, researchers employed the use of templating molecules to direct the growth of the aluminosilicates. Tetramethylammonium was the first of these templates used to prepare sodalite and others soon followed [61]. Recently, spectroscopic studies have... 

The dynamic character of the template-zeolite interactions has only been studied recently [39]. Experimental data (solid state and NMR between -120 C and 20°C), as well as molecular dynamic (MD) calculations at -150 C, -120 C and 0 C, indicate that the tetramethylammonium (TMA) ion occluded in the beta cage of sodalite has a considerable degree of rotational freedom. Figure 10, even at low temperature. MD shows that this rotational freedom originates from the dynamics of the zeolite lattice the distance between... 

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