Abstract
Dissolution of the various amounts of the cage compound, As4(NCH3)6, in arsenic trichloride gives homogeneous liquids, the proton nuclear magnetic resonance (NMR) spectra of which show three major peaks. These resonances are attributed to methylimino bridges in (1) a pair of monofunctional units, (2) a pair consisting of a monofunctional and a difunctional unit, and (3) a pair of difunctional units where a unit of functionality i is part of a molecule and has the structure AsCl3—i[N(CH3)—]i/2. Large deviations from random scrambling of these structure-building units with respect to the formation in a ring-free system of the molecule consisting of two monofunctional units bonded together is interpreted primarily in terms of the presence of ring molecules.
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