Evaluation of [C-12/C-11] Carbon Monoxide Binding to Copper(I) Tris(pyrazolyl) borate Complexes

Steven Kealey*, Andrew J. P. White, Antony D. Gee, Nicholas J. Long

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The copper(I) coordination chemistry of tris(3-R-5-R-pyrazolyl)borate ligands (Tp(R,R)) bearing substituent groups attached to the pyrazole rings has been investigated under nitrogen and carbon monoxide atmospheres [1 (Tp(Ph,SMe)) R = Ph, R = SCH3; 2 (Tp(Py)) R = 2-pyridyl, R = H; 3 (Tp(Phos,Me)) R = 2-(diphenylphosphinyl)phenyl, R = CH3]. The reactivity is strongly dependent on the coordinating potential of the substituent groups; in the absence of CO, 1 formed an insoluble complex [Cu(Tp(Ph,SMe))](n) (1b), 2 formed a multinuclear species [Cu(Tp(Py))](n) (2a; tetrameric in solution, dimeric in the solid state) and 3 formed a discrete complex [Cu(Tp(Phos,Me))] (3a). Under a CO atmosphere, 1 displayed irreversible CO binding to form the complex [Cu(Tp(Ph,SMe))CO] (1c), 2 showed reversible CO binding between 2a and the mononuclear species [Cu(Tp(Py))CO] (2b), and 3 did not bind to CO, but instead formed 3a. The reactivity of the copper complexes of 1 and 2 with [C-11]carbon monoxide has been examined in the radiochemistry laboratory to investigate the reversibility of (CO)-C-11 binding. The solid-state structures of [Tl(Tp(Ph,SMe))] (1a), 1c and 2a were elucidated by X-ray crystallography.

Original languageEnglish
Pages (from-to)1896-1905
Number of pages10
JournalEUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume2014
Issue number11
DOIs
Publication statusPublished - Apr 2014

Keywords

  • Copper
  • Carbonyl ligands
  • Tridentate ligands
  • Isotopic labelling
  • POSITRON-EMISSION-TOMOGRAPHY
  • IB METAL CHEMISTRY
  • HYDROTRIS(PYRAZOLYL)BORATE LIGANDS
  • TRIS(PYRAZOLYL)BORATE LIGAND
  • NITROSYL COMPLEXES
  • CO
  • REACTIVITY
  • PRESSURE
  • SODIUM
  • STATE

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