The coordination compound formed between ethylenediamine and cellulose has already been reported (<i>1,2</i>), and a study is in progress concerning the manner in which bonding occurs between the hydroxyl groups of the cellulose and the amino groups of the diamine. Two N-substituted diamines, N,N-dimethylethylenediamine (asymmetrical) and N,N'-dimethylethylenediamine (symmetrical), are on hand for use in an attempt to elucidate the bonding and structure of the cellulose-diamine complex. Infrared absorption spectroscopy was considered an invaluable tool for this structure study, complementing x-ray diffractometry, but its use was quickly hampered by lack of suitable infrared absorption data on the diamines. A search of the literature failed to turn up any spectra for the dimethylethylenediamines, either published or cataloged. Only one paper (<i>3</i>) was found for ethylenediamine, but the published spectrum (liquid film) is only over the range 3500-2700 cm<sup>−1</sup> (2.85-3.70 microns). In the present paper the infrared spectra of ethylenediamine and the two dimethylethylenediamines are given over the range 2-13 microns (5000-770 cm<sup>−1</sup>), and the absorption bands observed are correlated with molecular structure.
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