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Cyclometalation and pentafluorophenyl transfer in protonolysis of a chelating Bis-NHC platinum(II) complex

Jamali, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jorganchem.2018.08.023
  3. Abstract:
  4. The reactions of the bis-NHC platinum complex cis-[PtMe2(bis–NHC–1)], 1, in which bis–NHC–1 = 1,1′-methylene-3,3′-bis[(N-(tert-butyl)imidazole-2-ylidene], with strong acids and thermolysis of the reaction products were investigated. The reaction of 1 with 1 equiv B(C6F5)3 in acetone gave the borate complex cis-PtMe(bis–NHC–1)[OHB(C6F5)3], 2, that undergoes C–H bond activation of one of the tBu wingtips at 50 °C and yields the cyclometalated platinum complex Pt(bis–NHC–1′)[OHB(C6F5)3], 3, (where the prime denotes the cyclometalated ligand). However, the migration of two C6F5 groups from boron to the platinum center was observed when the thermolysis of 3 carried out in the presence of a large excess of benzene in acetone at 50 °C and gave the bis-NHC platinum complex cis-[Pt(C6F5)2(bis–NHC–1)], 4. The reaction of 1 with trifluoroacetic acid (TFAH) gave the bis-NHC platinum(II) complex cis-[Pt(bis–NHC–1) (TFA)2], 6, that is stable at 80 °C for several days. All complexes were characterized using NMR spectroscopy and the crystal structures of 4 and 6 were determined using X-ray crystallography. © 2018 Elsevier B.V
  5. Keywords:
  7. Source: Journal of Organometallic Chemistry ; Volume 876 , 2018 , Pages 43-49 ; 0022328X (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S0022328X18307344