Mass spectra of organo-stannanes and -plumbanes

Abstract

The fragmentation behaviour of organostannanes [SnPh,Et,-, (n = 0-4), SnPh,(CH,*CH,.Ph), spiro-[CH,], > Sn < [CH2I4, SnPh,X (X = F, CI, Br, or I), Sn2R, (R = Et, Ph)], organoplumbanes (PbEt,, PbPh4), and Ph4C have been examined under high resolution a t 70 ev. Parent ions are always of low abundance and decompose mainly by elimination of an odd-electron neutral fragment, whereas M R, + ions are of high abundance and lose even-electron fragments. Most of the ion current is carried by metal-containing species. Appearance-potential measurements on organostannanes have been used to evaluate djssociation-energy differences and dissociation energies in molecular ions.THE volatile alkyls of many elements were used by the mass spectra of a-bonded organometallic com-Aston in his classical isotope studies, but there have pounds. Dibeler and his co-workers 2-4 examined been comparatively few systematic investigations on several organomercury compounds, the tetramethyl derivatives of the Group IVB metals, and other lead V.

Synthesis and Vibrational and Mass Spectra of Ph3SnO2PMe2, Ph3SnO2PMePh and Ph3SnO2PPh2

“…The Ph2+ peaks appear in the spectra of Ph3S n 0 2P R R '. Such peak has been observed in the spectra of Ph3S n 0 2PCl2 [2] and Ph3SnX (X = F, Cl, Br) [23], The spectrum of Ph3S n 0 2PM e2 shows a fragment (m/e = 639, 1.5%) with mass greater than the mo lecular mass of the monomer, which is consistent with the polymeric nature of the compound. The peaks at 289 (8%) and 135 (4% ) in the spectrum of Ph3S n 0 2PM e2 could be assigned to ions Ph2MeSn+ and MeSn+, respectively, which may be formed through methyl group transfer.…”

“…On the other hand the most stable and therefore most abundant tin-containing fragments are the even-electron ions [23,24].…”

Organometallic Compounds: 27 NMR and mass spectra of hexasubstituted dimetals of group IV B

“…The mass spectrum of Et,Si, is quite similar to that of hexaethyldigermanium [3] [7] or of hexaethylditin [4] [7] and shows how easy the alkene elimination seems to be. Table 4 gives the different ion-abundances for triethyltrimethyldimetals.…”

Synthesis, Vibrational Spectra, Mass Spectrum and Crystal Structure of Tri-n-butyltin Diphenylphosphinate (n-Bu)3SnO2PPh2

“…The easier cleavage of the Sn-alkyl bond relative to the S n -P h bond has been previously observed in the mass spectra of phenylalkyltin compounds [22,23]. Fig.…”