A Raman spectral analysis of the ammonium iodide—dioxane complex

The solid state complex between ammonium iodide and 1,4-dioxane has been found by TGA studies to be a ($\text{1}\text{1}$) adduct rather than a ($\text{1}\text{2}$) adduct as previously formulated. The laser Raman spectra of NH₄I· dioxane and ND₄I· dioxane in the N-H and N-D stretching regions show decreases in frequency compared to NH₄I and ND₄I which are consistent with hydrogen bonding of the N-H · O variety as a means of incorporation of the dioxane into the salt crystal lattice.