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Cracking and dehydrogenation of cyclohexane by [(phen)M(X)]+ (M = Ni, Pd, Pt; X = H, CH3) in the gas phase

Citation

Parker, K and Weragoda, GK and Mohr, A and Canty, AJ and O'Hair, RAJ and Ryzhov, V, Cracking and dehydrogenation of cyclohexane by [(phen)M(X)]+ (M = Ni, Pd, Pt; X = H, CH3) in the gas phase, Organometallics, 40, (19) pp. 3351-3359. ISSN 0276-7333 (2021) [Refereed Article]


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DOI: doi:10.1021/acs.organomet.1c00467

Abstract

Gas-phase cationic ternary complexes of group 10 metals of the formula [(phen)M(X)]+, where phen = 1,10-phenanthroline (M = Ni, Pd, or Pt; and X = H or CH3), react with cyclohexane via CH activation, forming the respective cyclohexyl species [(phen)M(c-C6H11)]+. Upon collisional activation, these species undergo two key competing processes: (i) ring opening followed by "cracking" of the hydrocarbon chain leading to extrusion of propylene and ethylene as major products among other hydrocarbons; and (ii) dehydrogenation of the cyclohexyl ring leading to the loss of one, two, or three hydrogen molecules, with subsequent loss of cyclohexenes or benzene. The relative prevalence of these two pathways strongly depends on the metal ion, with Pt preferring dehydrogenation over ring opening. The multiple catalytic cycles operating within both pathways are described. Density functional theory (DFT) calculations are used to shed light on mechanistic aspects associated with the experimental results.

Item Details

Item Type:Refereed Article
Keywords:organopalladium, gas phase chemistry, organometallic mechanisms, DFT, mass spectrometry, gas phase catalysis, CH activation, naphthene chemistry
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 physical sciences
UTAS Author:Canty, AJ (Professor Allan Canty)
ID Code:147691
Year Published:2021
Deposited By:Chemistry
Deposited On:2021-11-11
Last Modified:2021-11-11
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