Studies on the Chemistry of Halogens and of Polyhalides. XVII. Halogen Complexes of Pentamethylenetetrazole¹

ELECTRON IMPACT SPECTROSCOPY OF TETRAMETHYLGERMANIUM, TRIMETHYLSILANE AND DIMETHYLMERCURY1

“…Heats of formation for various ions calculated using AHt (SiHMe3) =--54 kcal/mole compare very favorably with literature values14 that are available, and with the heats of formation for the ions from tetramethylsilicon. 3 The values for the heats of formation for the series of silanes reported by Tannenbaum, et al, 7, -36, -54 and -63 kcal./mole for SiH2Me2,. SiHMe3 and SiMe4, respectively, appear to fall into a regular series corresponding to relative stabilities of these compounds and are believed to be quite reliable.…”

“…AHi+ (SiCH3) then is calculated to be 218 kcal./mole, in fair agreement with the value of 234 kcal./mole. 3 m/e 44.-The heat of formation calculated for SiHCH3+, considering the accompanying formation of the neutral fragment C2H6, is 220 kcal/mole. This process is selected on the basis of interpolation m/e 73.-The heat of formation for this ion is calculated to be 146 kcal./mole, assuming the neutral fragment to be a hydrogen atom.…”

“…This can be the only process for formation of this ion, but the value of 146 kcal./mole for /ft+(SiMe3) appears low compared to the heat of formation of Si(CH3)3 = 165 kcal./mole calculated from the tetramethylsilicon study. 3 m/e 74.-The small abundance of the parent molecule-ion in the mass spectrum of trimethyl-silane undoubtedly contains significant contributions made by Si26(CH8)8+ and Si2S(CiaH8) (CH3)2+.…”

“…Lampe and Field2 have studied the electron impact spectroscopy of neopentane, and we have recently reported data for tetramethyl-silicon, -tin and -lead. 3 Electron impact data for the remaining member of the group IV tetramethyl compounds, tetramethylgermanium, is reported in this work. A study of two other related organometallics, trimethylsilane and dimethylmercury, also is included.…”

Some considerations of the electrolyte used to maintain constant ionic strength in studies on concentration stability constants in aqueous solutions. Application to the polarographic evaluation of thallium(I) complexes

“…/ |\ complexes with transition metal ions1-3 and with halogens. 4 The compounds act as unident ate ligands.…”