the 355-Hz band disappears on the addition of D20. Triphenylamine was used as obtained from Eastman Chemicals (Amx 298 nm, t 22.3 X lo3 in CH3CN).Elemental analyses for the compounds in the experimental section were submitted for review and are in agreement with theoretical values.Preparation of the ?r Complexes. Method A. A hot solution of 2.5 X mol of the pyrylium salt in 20 ml of acetonitrile was added to a hot solution of 2.5 X mol of V in 30 ml of acetonitrile. On cooling, the complex separates in pure form. It may be crystallized from acetonitrile.