Synthesis, characterization and reactions of [RhCl(CO){(Ph2P(CH2CH2O)mCH2CH2Ph2-P,P’)}]n (m = 3, 4, 5 n = 1, 2 …) metallacrown crown ethers

Academic Article

Abstract

  • The reactions of [RhCl(cod)] and Ph P(CH CH O) CH CH PPh P (n = 3, 4, 5) under a CO atmosphere yield [RhCl(CO){(Ph P(CH CH O) CH CH Ph -P,P′)}] monocarbonyl metallacrown ethers. These complexes are mixtures of cyclic n-mers and monomers with trans coordination geometries at the rhodium. The monocarbonyl rhodium metallacrown ethers reversibly react with CO at atmospheric pressure to form [RhCl(CO) {(Ph P(CH CH O) CH CH Ph -P,P′)}] dicarbonyl metallacrown ethers. These complexes are only stable under a CO atmosphere as demonstrated by P{ H} NMR spectroscopy. Upon prolonged exposure to the atmosphere, all the monocarbonyl metallacrown ethers lose CO and undergo phosphine ligand oxidation to form [RhCl(H O){Ph P(O)(CH CH O) CH CH P(O)Ph -O,O’}] metallacrown ethers. These are the first examples of metallacrown ethers in which the transition metal is coordinated via phosphine oxide donors. 2 2 2 2 n 2 2 2 2 2 2 n 2 2 2 m 2 2 2 2 n 2 2 2 m 2 2 2 2 n 2 2 2 31 1
  • Authors

    Published In

    Digital Object Identifier (doi)

    Author List

  • Smith DC; Cagle EC; Gray GM
  • Start Page

  • 78
  • End Page

  • 82
  • Volume

  • 876