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On a Ti Study of Molecular Motion in Some Tetra Substituted Ammonium Halides

1979; De Gruyter; Volume: 34; Issue: 11 Linguagem: Inglês

10.1515/zna-1979-1107

1865-7109

Fevzī Köksal,

Industrial Gas Emission Control

The spin-lattice relaxation times of tetramethylammonium bromide (CH 3 ) 4 NBr , iodide (CH 3 ) 4 NI, tetraethylammonium chloride (CH 3 CH 2 ) 4 NCl, bromide (CH 3 CH 2 ) 4 NBr, iodide (CH 3 CH 2 ) 4 NI , tetrapropylammonium iodide [CH 3 (CH 2 ) 2 ] 4 NI, tetrabutylammonium bromide [CH 3 (CH 2 ) 3 ] 4 NBr, iodide [CH 3 (CH 2 ) 3 ] 4 NI, tetraheptylammonium bromide [CH 3 (CH 2 ) 6 ] 4 NBr and iodide [CH 3 (CH 2 ) 6 ] 4 NI were measured at 60 MHz in the temperature interval 100 K to near the melting points. Two minima of T 1 were observed for tetramethylammonium halides, for tetraethylammonium bromide and iodide and for tetrapropylammonium iodide. The minima in T 1 were attributed to CH 3 group reorientations and reorientations of the tetramethyl, ethyl and propylammonium cations. The activation energies of the processes were determined