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https://hdl.handle.net/2440/116543
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Type: | Journal article |
Title: | Decarboxylation versus acetonitrile loss in silver acetate and silver propiolate complexes, [RCO₂AgAIPR(CH₃CN)n]+ (where R = CH₃ and CH₃C≡C; n = 1 and 2) |
Author: | Li, J. Khairallah, G. O'Hair, R. |
Citation: | Australian Journal of Chemistry: an international journal for chemical science, 2015; 68(9):1385-1391 |
Publisher: | CIRO Publishing |
Issue Date: | 2015 |
ISSN: | 0004-9425 |
Statement of Responsibility: | Jiawei Li, George N. Khairallah, Dand Richard A. J. O’Hair |
Abstract: | Gas-phase experiments using collision-induced dissociation in an ion trap mass spectrometer have been used in combination with density functional theory (DFT) calculations (at the B3LYP/SDD6–31+G(d) level of theory) to examine the competition between decarboxylation and loss of a coordinated acetonitrile in the unimolecular fragmentation reactions of the silver acetate and silver propiolate complexes, [RCO2Ag2(CH3CN)n]+ (where R = CH3 and CH3C≡C; n = 1 and 2), introduced into the gas-phase via electrospray ionisation. When R = CH3, loss of acetonitrile is the sole reaction channel observed for both complexes (n = 1 and 2), consistent with DFT calculations, which highlight that the barriers for decarboxylation 2.18 eV (n = 2) and 1.96 eV (n = 1) are greater than the binding energies of the coordinated acetonitriles (1.60 eV for n = 2; 1.64 eV for n = 1). In contrast, when R = CH3C≡C, decarboxylation is the main fragmentation pathway observed for both complexes (n = 1 and 2), with loss of acetonitrile only being a minor product channel. This is consistent with DFT calculations, which reveal that the barriers for decarboxylation are 1.17 eV (n = 2) and 1.16 eV (n = 1), which are both below the binding energies of the coordinated acetonitriles (1.55 eV for n = 2; 1.56 eV for n = 1). The barrier for decarboxylation of [CH3C≡CCO2Ag2]+ is 1.22 eV, which is less than the 2.06 eV reported for decarboxylation of [CH3CO2Ag2]+ (Al Sharif et al. Organometallics, 2013, 32, 5416). The observed ease of decarboxylation of silver propiolate complexes in the gas-phase is consistent with the recently reported use of silver salts in metal catalysed decarboxylative C–C and C–X bond forming reactions of propiolic acids. |
Rights: | Journal compilation © CSIRO 2015 |
DOI: | 10.1071/CH15210 |
Published version: | http://dx.doi.org/10.1071/ch15210 |
Appears in Collections: | Aurora harvest 8 Chemistry publications |
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