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Gas-phase synthesis and reactivity of ligated group 10 ions in the formal +1 oxidation state

Citation

Greis, K and Yang, Y and Canty, AJ and O'Hair, RAJ, Gas-phase synthesis and reactivity of ligated group 10 ions in the formal +1 oxidation state, Journal of The American Society for Mass Spectrometry, 30, (10) pp. 1867-1880. ISSN 1044-0305 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 American Society for Mass Spectrometry

DOI: doi:10.1007/s13361-019-02231-5

Abstract

Electrospray ionization of the group 10 complexes [(phen)M(O2CCH3)2] (phen=1,10-phenanthroline, M = Ni, Pd, Pt) generates the cations [(phen)M(O2CCH3)]+, whose gas-phase chemistry was studied using multistage mass spectrometry experiments in an ion trap mass spectrometer with the combination of collision-induced dissociation (CID) and ion-molecule reactions (IMR). Decarboxylation of [(phen)M(O2CCH3)]+ under CID conditions generates the organometallic cations [(phen)M(CH3)]+, which undergo bond homolysis upon a further stage of CID to generate the cations [(phen)M]+ in which the metal center is formally in the +1 oxidation state. In the case of [(phen)Pt(CH3)]+, the major product ion [(phen)H]+ was formed via loss of the metal carbene Pt=CH2. DFT calculated energetics for the competition between bond homolysis and M=CH2 loss are consistent with their experimentally observed branching ratios of 2% and 98% respectively. The IMR of [(phen)M]+ with O2, N2, H2O, acetone, and allyl iodide were examined. Adduct formation occurs for O2, N2, H2O, and acetone. Upon CID, all adducts fragment to regenerate [(phen)M]+, except for [(phen)Pt(OC(CH3)2)]+, which loses a methyl radical to form [(phen)Pt(OCCH3)]+ which upon a further stage of CID regenerates [(phen)Pt(CH3)]+ via CO loss. This closes a formal catalytic cycle for the decomposition of acetone into CO and two methyl radicals with [(phen)Pt]+ as catalyst. In the IMR of [(phen)M]+ with allyl iodide, formation of [(phen)M(CH2CHCH2)]+ was observed for all three metals, whereas for M = Pt also [(phen)Pt(I)]+ and [(phen)Pt(I)2(CH2CHCH2)]+ were observed. Finally, DFT calculated reaction energetics for all IMR reaction channels are consistent with the experimental observations.

Item Details

Item Type:Refereed Article
Keywords:organonickel, organopalladium, organoplatinum, DFT, mass spectrometry
Research Division:Chemical Sciences
Research Group:Inorganic Chemistry
Research Field:Transition Metal Chemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
UTAS Author:Canty, AJ (Professor Allan Canty)
ID Code:134362
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Chemistry
Deposited On:2019-08-09
Last Modified:2019-12-09
Downloads:0

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