title: K⋅⋅⋅F/O interactions bridge copper(I) fluorinated alkoxide complexes and facilitate dioxygen activation.
abstract: Seven E[Cu(OR)2] copper(I) complexes (E = K(+), {K(18C6)}(+) (18C6 = [18]crown-6), or Ph4P(+); R = C4F9, CPhMe(F)2, and CMeMe(F)2) have been prepared and their reactivity with O2 studied. The K[Cu(OR)2] species react with O2 in a copper-concentration-dependent manner such that 2:1 and 3:1 Cu/O2 adducts are observed manometrically at -78 °C. Analogous reactivity with O2 is not observed with the {K(18C6)}(+) or Ph4P(+) derivatives. Solution conductivity data demonstrate that these K[Cu(OR)2] complexes do not behave as 1:1 electrolytes in solution. The K(+) ions induce aggregation of multiple [Cu(OR)2](-) units through K⋅⋅⋅F/O interactions and thereby effect irreversible O2 reduction by multiple Cu centers. Bond valence analyses for the potassium cations confirm the dominance of the fluorine interactions in the coordination spheres of K(+) ions. Intramolecular hydroxylation of ligand aryl and alkyl C-H bonds is observed. Nucleophilic reactivity with CO2 is observed for the oxygenated Cu complexes and a Cu(II) carbonate has been isolated and characterized.
authors.affiliation: Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA.
authors.forename: June S
authors.initials: JS
authors.lastname: Lum
authors.forename: Laleh
authors.initials: L
authors.lastname: Tahsini
authors.forename: James A
authors.initials: JA
authors.lastname: Golen
authors.forename: Curtis
authors.initials: C
authors.lastname: Moore
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold
authors.forename: Linda H
authors.initials: LH
authors.lastname: Doerrer
mesh_terms: D003300:Copper / Q000737:chemistry*; D006845:Hydrocarbons, Fluorinated / Q000138:chemical synthesis* / Q000737:chemistry; D008024:Ligands; D008956:Models, Chemical; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D012996:Solutions
chemical_list: D006845:Hydrocarbons, Fluorinated; D008024:Ligands; D009942:Organometallic Compounds; D012996:Solutions; D003300:Copper; D010100:Oxygen