Bands in the far-IR spectra of 18-crown-6 complexes of nitromethane, acetronitrile, and malonodinitrile are attributed to hydrogen bonding. The <i>v</i><sub>σ</sub> vibrational mode is assigned for these neutral complexes. Solution studies of the complexes in CHCl<sub>3</sub> show that a substantial amount of both the nitromethane complex and the malonodinitrile complex remains intact. The acetonitrile complex, however, appears to dissociate in CHCl<sub>3</sub>.

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