The influence of ligand substituents and donor atom sets on the gas phase electron attachment reactions of bis-chelates of nickel(II)
✍ Scribed by D. R. Dakternieks; I. W. Fraser; J. L. Garnett; I. K. Gregor; M. Guilhaus
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 674 KB
- Volume
- 15
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
Elecíron attachment reactions and negative ion mass spectra which were obtained under negative chemícal ionization conditions have been examined for a series of 21 nickel(I1) bis-chelates of formula Ni[RICXCHCYR'],. Three ligand donor atom sets (X, Y), respectively O,, O&, S, were investigated for each of the substituent combinations, viz.: R'=CH,, CF, or GH,O, R'=CH3; R1=C6H5, CH, or CF,, R' = C6H,; and R' = R' = tert-C4&. While the ligand substitnent combinations exerted considerable influence over the various ion decomposition reactions, the relative molecular ion stabilities were largely dependent on the iigand donor atom sets and followed the sequence O43OZSz>S4 for most substituent combinations. Rationaüzations are offered in terms of redudve electron capture reactions involving metal-based orbitals, as weil as the increasing stabiüties of reaction products as sulphur is incorporated into the iigand donor atom sets. A comparison is also given of negative ion mass spectral data obtained under electron impact conditions as weil as negative chemical ionization eonditions when methane was used as an electron energy moderating gas.