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Inner-sphere versus outer-sphere coordination of BF4- in a NHC-gold(I) complex

(2017) ORGANOMETALLICS. 36(15). p.2861-2869
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Abstract
The role of counterions in chemistry mediated by gold complexes stretches much further than merely providing charge balance to cationic gold species. Interplay between their basicities and coordination strengths influences interactions with both the gold center and substrates in catalysis. Actual monogold-(I) active species are generally believed to be monocoordinated species, formed from the abstraction or the decoordination of a second ligand from precursor complexes, but only a small amount of experimental evidence exists to underpin the existence of these transient species. The formation of a bench-stable neutral IPrCI-gold(I) tetrafluoroborate complex is reported herein. Experimental studies by X-ray diffraction analysis and NMR spectroscopy and theoretical studies by DFT calculations were conducted to determine the composition, structure, and behavior of this complex. The absence of an auxiliary ligand resulted in inner-sphere coordination of the counterion in the solid state. In solution, an equilibrium between two conformations was found with the counterion occupying inner-sphere and outer-sphere positions, respectively. Stoichiometric and catalytic reactivity studies with the tetrafluoroborate complex have been conducted. These confirmed the lability of the inner-sphere coordinating counterion that gives the IPrCI-gold(I) fragment behavior similar to that of related systems.
Keywords
N-HETEROCYCLIC CARBENE, SILVER-FREE PROTOCOLS, GOLD CATALYSIS, GOLD(III) COMPLEXES, REACTION-MECHANISM, HIGHLY EFFICIENT, STEREOSELECTIVE HYDROCARBOXYLATION, ALKYNES, COUNTERION, NHC

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Citation

Please use this url to cite or link to this publication:

Chicago
Veenboer, Richard MP, Alba Collado, Stéphanie Dupuy, Tomas Lebl, Laura Falivene, Luigi Cavallo, David B Cordes, Alexandra MZ Slawin, Catherine Cazin, and Steven Nolan. 2017. “Inner-sphere Versus Outer-sphere Coordination of BF4- in a NHC-gold(I) Complex.” Organometallics 36 (15): 2861–2869.
APA
Veenboer, R. M., Collado, A., Dupuy, S., Lebl, T., Falivene, L., Cavallo, L., Cordes, D. B., et al. (2017). Inner-sphere versus outer-sphere coordination of BF4- in a NHC-gold(I) complex. ORGANOMETALLICS, 36(15), 2861–2869.
Vancouver
1.
Veenboer RM, Collado A, Dupuy S, Lebl T, Falivene L, Cavallo L, et al. Inner-sphere versus outer-sphere coordination of BF4- in a NHC-gold(I) complex. ORGANOMETALLICS. 2017;36(15):2861–9.
MLA
Veenboer, Richard MP, Alba Collado, Stéphanie Dupuy, et al. “Inner-sphere Versus Outer-sphere Coordination of BF4- in a NHC-gold(I) Complex.” ORGANOMETALLICS 36.15 (2017): 2861–2869. Print.
@article{8536737,
  abstract     = {The role of counterions in chemistry mediated by gold complexes stretches much further than merely providing charge balance to cationic gold species. Interplay between their basicities and coordination strengths influences interactions with both the gold center and substrates in catalysis. Actual monogold-(I) active species are generally believed to be monocoordinated species, formed from the abstraction or the decoordination of a second ligand from precursor complexes, but only a small amount of experimental evidence exists to underpin the existence of these transient species. The formation of a bench-stable neutral IPrCI-gold(I) tetrafluoroborate complex is reported herein. Experimental studies by X-ray diffraction analysis and NMR spectroscopy and theoretical studies by DFT calculations were conducted to determine the composition, structure, and behavior of this complex. The absence of an auxiliary ligand resulted in inner-sphere coordination of the counterion in the solid state. In solution, an equilibrium between two conformations was found with the counterion occupying inner-sphere and outer-sphere positions, respectively. Stoichiometric and catalytic reactivity studies with the tetrafluoroborate complex have been conducted. These confirmed the lability of the inner-sphere coordinating counterion that gives the IPrCI-gold(I) fragment behavior similar to that of related systems.},
  author       = {Veenboer, Richard MP and Collado, Alba and Dupuy, St{\'e}phanie and Lebl, Tomas and Falivene, Laura and Cavallo, Luigi and Cordes, David B and Slawin, Alexandra MZ and Cazin, Catherine and Nolan, Steven},
  issn         = {0276-7333},
  journal      = {ORGANOMETALLICS},
  keyword      = {N-HETEROCYCLIC CARBENE,SILVER-FREE PROTOCOLS,GOLD CATALYSIS,GOLD(III) COMPLEXES,REACTION-MECHANISM,HIGHLY EFFICIENT,STEREOSELECTIVE HYDROCARBOXYLATION,ALKYNES,COUNTERION,NHC},
  language     = {eng},
  number       = {15},
  pages        = {2861--2869},
  title        = {Inner-sphere versus outer-sphere coordination of BF4- in a NHC-gold(I) complex},
  url          = {http://dx.doi.org/10.1021/acs.organomet.7b00345},
  volume       = {36},
  year         = {2017},
}

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