Carbon cage isomers and magnetic Dy⋯Dy interactions in Dy2O@C88 and Dy2C2@C88 metallofullerenes

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Wei Yang - , Chair of Molecular Functional Materials (cfaed), Leibniz Institute for Solid State and Materials Research Dresden, Soochow University (Author)
  • Georgios Velkos - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Svetlana Sudarkova - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Bernd Büchner - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Stanislav M. Avdoshenko - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Fupin Liu - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Alexey A. Popov - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Ning Chen - , Soochow University (Author)

Abstract

Three isomers of Dy2O@C88 and two isomers of Dy2C2@C88 were synthesized and structurally characterized by single-crystal X-ray diffraction, vibrational spectroscopy, and DFT calculations. Both types of clusterfullerenes feature 4-fold electron transfer to the carbon cage, thus resulting in the same carbon cage isomers identified as C1(26), Cs(32), and D2(35). The studies of Dy⋯Dy superexchange interactions in Dy2O and Dy2C2 clusters revealed that the O2− bridge favors antiferromagnetic coupling whereas the acetylide group C22− supports ferromagnetic coupling of Dy magnetic moments. The strength of the coupling showed a considerable variability in different cage isomers. All metallofullerenes exhibited slow relaxation of magnetization and magnetic hysteresis. In Dy2O@C88 isomers the hysteresis remained open up to 7-9 K, while in Dy2C2@C88 the hysteresis loops were closed already at 2.5 K. This study demonstrated that both the endohedral bridge between metal atoms and the fullerene cage play an important role in magnetic interactions and relaxation of magnetization.

Details

Original languageEnglish
Pages (from-to)5805-5819
Number of pages15
JournalInorganic chemistry frontiers
Volume9
Issue number22
Publication statusPublished - 26 Sept 2022
Peer-reviewedYes

Keywords

ASJC Scopus subject areas