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Carbonylation of Iridium(I) and Iridium(III) Complexes, trans-Ir(CO)(R)(P(p-tolyl)3)2 (R = Me, OMe, OCH2Ph, OC6H4Me, OH) and Ir(CO)(Me)(SO4)(P(p-tolyl)3)2, and Facile Elimination of Hard Ligands: Crystal and Molecular Structures of Ir(CO)(Me)(SO4)(P(p-tolyl)3)2 and [Ir(CO)3(P(p-tolyl)3)2][HSO4]

  • Sherri L. Randall
  • , Cynthia A. Miller
  • , Ronald F. See
  • , Melvyn Rowen Churchill
  • , Thomas S. Janik
  • , Charles H. Lake
  • , Jim D. Atwood
  • SUNY Buffalo

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Carbonylation of several iridium(I) complexes, trans-Ir(CO)(R)(P(p-tolyl)3)2 lead to products Ir(CO)2(CO)R)(P(p-tolyl)3)2, R = Me, OCH2Ph; and Ir2(CO)6(P(p-tolyl)3)2, R = OH, OMe, and OC6H4Me) that depend on the nature of the R group. Carbonylation of the iridium(III) complex, Ir(CO)(Me)(SO4)(P(p-tolyl)3)2 leads to two iridium products, [Ir(CO)3(P(p-tolyl)3)2+] and Ir(CO)3(C(O)Me)(P(p-tolyl)3)2 by two different pathways. Structures of Ir(CO)(Me)(SO4)- (P(p-tolyl)3)2 and [Ir(CO)3(P(p-tolyl)3)2][HSO4] were determined to assist in the interpretation. The complex Ir(CO)(Me)(SO4)(P(p-tolyl)3)2 crystallizes in the orthorhombic space group Pbcn with a = 18.237(3), b = 12.572(2), c = 18.584(2) Å, V = 4260.9(11) Å3 and Z = 4. The structure was refined to R = 1.98% for 1640 reflections with F > 6σ(F). The molecule lies on a site of C2 symmetry, necessitating a disorder of carbonyl and methyl ligands. Bond distances around the octahedral iridium(III) center include Ir-CO = 1.823(13), Ir-CH3 = 2.127(14), Ir-–P= 2.398(1) and Ir–O(SO4) = 2.119(4) Å. The species [Ir(CO)3(P(p-tolyl)3)2][HSO4] crystallizes in the monoclinic space group P21/n with a = 11.490(2), b = 12.255(3), c = 30.873(7) Å, β = 92.826(17)°, V = 4342.0(15) Å3 and Z = 4. The structure was refined to R = 6.09% for 2591 reflections with F > 6σ(F). The Ir(CO)3P2 core of the cation has a geometry slightly distorted from D3h symmetry, with Ir–P = 2.363(5) and 2.374(5) Å and Ir-CO = 1.921(21)− 2.012(28) Å. The HSO4 anion undergoes substantial librational motion (or is disordered) and is associated with S–O distances ranging from 1.31(4) through 1.49(3) Å.

Original languageEnglish
Pages (from-to)5088-5095
Number of pages8
JournalOrganometallics
Volume13
Issue number12
DOIs
StatePublished - Dec 1 1994

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