Abstract
Density functional CAM-B3LYP/6-311++G(d,p)/SDD quantum chemical calculations of a gold(I) complex with the pentakis(methoxycarbonyl)cyclopentadienyl ligand Ph3PAu[C5(CO2Me)5] and gold(I) complexes with polydentate amidinyltetrakis(methoxycarbonyl)cyclopentadienyl ligands Ph3PAu[N(Ar)C(Ar’)N(Ar)C5(CO2Me)4] were carried out. It was shown that the former system, where the Au atom is bonded to the C(sp3) atom of the cyclopentadiene ring and additionally coordinated by two neighboring ring carbon atoms, exhibits fluxional behavior due to rapid 1,5-sigmatropic shifts of the AuPPh3 group along the perimeter of the five-membered ring occurring with an energy barrier (ΔG≠298 K) of 5.1 kcal mol−1. Contrary to this, all other gold(I) complexes are more stable as ylide isomers, where the gold atom is bonded to the terminal nitrogen atom of the amidinium fragment and additionally coordinated by the π-system of the cyclopentadiene ring. According to the CAM-B3LYP/6-311G(d,p)/SDD calculations, alternative isomers, in which the gold atom is bonded to the carbon atom of the cyclopentadiene ring or to the oxygen atom of the methoxycarbonyl substituent, are much less stable (ΔEZPE = = 12.8−20.0 kcal mol−1).
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This work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (State Assignment in the Field of Scientific Activity, Project No. 0852-2020-0019).
No human or animal subjects were used in this research.
The authors declare no competing interests.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1847–1855, September, 2022.
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Dushenko, G.A., Mikhailov, I.E., Mikhailova, O.I. et al. Structure elucidation of pentakis(methoxycarbonyl)- and amidinyltetrakis(methoxycarbonyl)cyclopentadienyl complexes of gold(I) by quantum chemistry methods. Russ Chem Bull 71, 1847–1855 (2022). https://doi.org/10.1007/s11172-022-3601-4
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DOI: https://doi.org/10.1007/s11172-022-3601-4