Synthesis and crystal structure of an M4L6 tetrahedral cage with outward-facing pockets from a substituted pyrazolyl–pyridine ligand

Nawal Al-Rasbi*, Michael D. Ward

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The self-assembly of metal–polydentate ligands to give supramolecular tetrahedral complexes is of considerable current interest. A new ligand, 4-benzyl-2-[1-(2-{[3-(4-benzylpyridin-2-yl)-1H-pyrazol-1-yl]methyl}benzyl)-1H-pyrazol-3-yl]pyridine (L), with chelating pyrazolyl–pyridine units substituted on the 4-position of the pyridyl ring with benzyl units, has been synthesized and fully characterized. The self-assembly of L with cobalt(II) gave rise to a tetrahedral cage (hexakis{μ-4-benzyl-2-[1-(2-{[3-(4-benzylpyridin-2-yl)-1H-pyrazol-1-yl]-methyl}benzyl)-1H-pyrazol-3-yl]pyridine}perchloratotetracobalt(II) octakis-(perchlorate) acetonitrile undecasolvate, [Co4(ClO4)(C38H32N6)6](ClO4)7.-11CH3CN) with approximate T symmetry. The X-ray crystal structure of the cage, i.e. [Co4L6⊂ClO4](ClO4)7, shows that the substituted benzyl groups are oriented away from the centres of their respective ligands towards the CoII vertices, making small outward-facing pockets from three benzyl rings at the corners of the tetrahedron.

Original languageEnglish
Pages (from-to)961-966
Number of pages6
JournalActa Crystallographica Section C: Structural Chemistry
Issue number8
Publication statusPublished - Aug 2018


  • Cobalt(II)
  • Crystal structure
  • Encapsulated anion
  • Pocket
  • Supramolecular chemistry
  • Tetrahedral cage

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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