Chromium Chains as Polydentate Fluoride Ligands for Actinides and Group IV Metals

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Ji-Dong Leng
  • Andreas Kostopoulos
  • Liam Isherwood
  • Ana-Maria Ariciu
  • Inigo Vitorica-Yrezabal
  • Robin Pritchard
  • George Whitehead
  • Grigore Timco

Abstract

The reactions of {Cr6} horseshoe chains {[nPr2NH2]3[Cr6F11(O2CtBu)10]}2, 1 and precursors of actinides and group IV metals led to a series of ring complexes [nPr2NH2][Cr7TiF6O2(O2CtBu)16], 2, [nPr2NH2][Cr6Ti2F5O3(O2CtBu)16], 3, [Cr6ThF7(O2CtBu)15 (Me2SO)], 4, [(nPr2NH2)2(Cr6Th2F12(O2CtBu)16)], 5 and [nPr2NH2][Cr6U2O2F8(O2CtBu)16(Me2SO)], 6. X-ray structure studies indicate that the {Cr6} chains maintain their structures in these complexes, acting as polydentate fluoride ligands. Their static magnetic properties were measured and fitted by isotropic exchange Hamiltonian. In accordance with 1, the magnetic exchanges between CrIII are antiferromagnetic, while the exchange interactions can be modified by the tetravalent metals. For compound 6, ferromagnetic exchanges JCr–U and JU–U are obtained. EPR spectra of compounds 2–5 were measured at Q band and were simulated. The spectrum of 2 has the same profile as {Cr7Cd} and {Cr7Zn} rings with a ground state S = 3/2. 3, 4 and 5 give similar EPR spectra with S = 0 ground states.

Bibliographical metadata

Original languageEnglish
Pages (from-to)6361-6369
JournalDalton Transactions
Volume47
Issue number18
Early online date16 Apr 2018
DOIs
Publication statusPublished - 14 May 2018