Mass spectra of diborane-d6 and ethane-d6

Abstract

The comple te mass spectra of B2D6 and C2D6 and t he partial spectrum of B2DSH h ave been obtained for ioni zin g voltages of 50 volts and 70 volts. An analytical procedure is given for deriving the contribu tion of all ions containing a hydrogen atom from the polyisotopic spectrum of a m ixture of B2D6 and B2DsH . A comparison of spectra of B2D6 and B2H6 and of C2D6 an d C2H6 indi cates that substitution of deuterium for hydrogen has only a sli gh t effect on t he di ssociation probabilities in dibor ane and ethane. An excep tion is t he occurren ce of a metastable t ran it ion in B2D6 that does not occur in B2Hij viz B2DS+ ...... B2D3++ 2D .S im ple statistical consid erations, based upon the assumption of equal probabi lities for t he removal of a deuterium or a protium , g ive a di ssociatio ll pattern that differs by more t han experimental error fr om th at observed .

Mass spectra of deuteroacetylenes, monodeuterobenzene, and deuteronaphthalenes

“…In most hydrocarbons there is no basis for making such a computation. There is a significant difference between corresponding mass peaks of CloHs and ClODs, which is comparable with th e difference between C2H 2 and C2D2, and CH4 and CD4 [3], and C2H 6 and C2D 6 [7] . The probability of losing D atoms is less than that of losing H atoms, but fragment ions involving breaking of C-C bonds may be either greater or less in the deutero compound .…”

Mass spectra of some deuteroethanes

“…While there is a rather extensive literature on mass spectra of deuterohydrocarbons, published data on deuteroethanes are fragmentary. Schissler, Thompson, and Turkevich [ 1 ] 3 published mass spectra of four deuteroethanes in 1951 in the mass range 12 to 36 and Dibeler [ 2 ] published a mass spectrum of C 2 D 6 of good purity.…”