Pyrolysis and Molecular-Beam Mass Spectrum of Tetracarbonylnickel(0)

Abstract

A positive ion mass spectrum of Ni(C0h was determined using a magnetic sector spectrometer capable of distinguishing the molecular-beam (zero ion-source contact) mass spectrum from possible contributions of pyrolysis intermediates which may be formed in the ion source. The mass spectrum is in fair agreement with a previous conventional mass spectrum. Evidence for gas-phase intermediates such as Ni(CO), could not be found by sampling the contents of a low-pressure flow reactor. Previously unreported features of the mass spectrum include metastable ion peaks, each involving loss of one neutral CO group froma Ni(CO)$+g ion (q = l, 2), and fragment ions resulting from C-0 scission and from rearrangement. From appearance potential data, the ionization

UV photosynthesis of nickel carbonyl

“…13,14 The volatile compounds formed in this study are inert to reaction in acidic and alkaline solutions and are stable at room temperature. These species can be trapped at low temperatures (partially, using a dry-ice-acetone bath at −78…”

Appearance potentials of ion fragments of iron pentacarbonyl

“…The presence of FeC30,+ was confirmed. A new fragment was identified as FeC,' and is analogous to MC,' fragments observed for a number of carbonyl molecules (4,6).…”

Mass spectrometry of nickel carbonyl for modeling of automobile catalysts

“…The difference in the experimental values was explained by the methodologies used to measure the values for the appearance and ionization potentials, by the mass spectrometers used, and by the temperatures of the ionization chambers (10). Pyrolysis and molecular beam studies of nickel carbonyl have shown that the relative intensities of the species in a nickel carbonyl spectrum vary about 10% over the temperature range of 19 to 200 °C (11) and the absolute intensities decrease by about 96% in that temperature interval. Pignataro and Lossing reported that no mass spectrum of nickel carbonyl could be obtained with source temperatures greater than 250 °C except for an intense signal due to [CO]+ [m/z 28] (12) which implied that complete decomposition of nickel carbonyl had occurred.…”