DISAPPEARANCE OF THE COLOR OF SYSTEMS THAT EXHIBIT WEAK MOLECULAR COMPLEXING, ON FREEZING.
Abstract
Electron acceptors and electron donors that permit only weak molecular association in solution are examined. Such acceptors are tetranitromethane, trinitromesitylene, 2,2',4,4',6,6'-hexanitrobiphenyl, and such donors are tetrakis(dimethylamino)ethylene, tetramethyl-2-tetramethyl-2-tetrazene, triphenylamine and the sterically hindered alkylbenzenes. The colors of many of the systems above, particularly those whose optical densities decrease by the inverse square of the dilution, vanish on freezing in the case of the pure mixed samples, for many systems in solution, but not for those where glass formation occurs. Melting point diagrams and X-ray crystal studies confirm the lack of compound formation and show that the colorless solids are composed of two-phase aggregates of separate donor and acceptor materials. For none of the systems described, in solution, is an increase of optical density with increasing temperature found. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1966
- Accession Number
- AD0803418
Entities
People
- L. A. Burkardt
- P. R. Hammond
Organizations
- Naval Air Weapons Station China Lake