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X-ray powder diffraction data and thermal expansion of N(CH3)4Br and N(CH3)4I

  • Alex Xenopoulos (a1) (a2), Martina Ralle (a1) (a2), Anton Habenschuss (a1) (a2) and Bernhard Wunderlich (a1) (a2)


The X-ray powder diffraction patterns for tetramethylammonium bromide and iodide have been measured from near room temperature up to decomposition/sublimation. The unit cell parameters were refined and the coefficients of thermal expansion calculated. Unlike N(CH3)4Cl [M. Stammler, J. Inorg. Nucl. Chem. 29, 2203–2221 (1967)], N(CH3)4Br (1Br) and N(CH3)4I (1I) undergo no solid–solid transitions before decomposition/sublimation as was observed earlier by thermal analysis [S. S. Chang and E. F. Westrum, J. Chem. Phys. 36(9), 2420–2423 (1962); Coulter etal., J. Am. Chem. Soc. 62, 2845–2851 (1940); Xenopoulos etal., Mol. Cryst. Liq. Cryst. 214, 63–79 (1992)].



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a) Present address: Millipore Corporation, 80 Ashby Rd., Bedford, MA 01730.


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