Accession Number : AD0275784

Title :   RESEARCH AND DEVELOPMENT TO SYNTHESIZE AND ISOLATE LESSER OR UNKNOWN BORANES

Corporate Author : NATIONAL ENGINEERING SCIENCE CO PASADENA CALIF

Personal Author(s) : DITTER,J.F. ; LANDESMAN,H.E. ; WILLIAMS,R.E.

Report Date : 31 DEC 1961

Pagination or Media Count : 1

Abstract : Attempts were made to prepare, isolate and characterize higher molecular weight boranes between hexaborane-10 and decaborane-14. Conglomerate mixtures of these species were prepared as by-products in the high voltage discharge of diborane, then concentrated by vacuum fractionation, which removed major portions of the more volatile compounds (tetraborane and pentaborane). An investigation was made of separation techniques such as fractional crystallization, vapor chromatography and vacuum flashing. An NMR spectrum that appears to be due predominantly to octaborane (but possibly also nonaborane) was obtained, and a tentative structure has been inferred. Mass spectra corresponding to the parent ion fragments o heptaborane and nonaborane are given. The nonaborane spectrum undoubtedly is that of B9H15, while that of heptaborane is perhaps B7H17, since unstable boranes generally cut off below the mass number of the parent compound. A plausible structure of heptaborane is illustrated. A general discussion of the application of NMR to boranes and derivatives is included. (Author)

Descriptors :   *BORON COMPOUNDS, *DECABORANES, *HYDRIDES, CHROMATOGRAPHIC ANALYSIS, CRYSTALLIZATION, MOLECULAR STRUCTURE, NUCLEAR MAGNETIC RESONANCE, SEPARATION, SYNTHESIS, VAPORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE