Abstract
1. From the IR spectra of diethylcyanomethylphosphine oxide and diphenylcyanomethylphosphine oxide it follows that the equilibrium of two conformers is characteristic for the solutions of these compounds. A noticeable association of the molecules is manifested under high concentration conditions. 2. The dipole moments of the gauche conformers of the studied molecules, which contain polar P=O and C≡N groupings, are much lower than those calculated by the vector scheme due to coulomb interaction.
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