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September 17, 2026InorganicsOpen Access

Giving Molecular Cavity Wall Extensions to Pseudo M(II)7 (M = Co, Ni, Zn) Metallocalix6arenes

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Authors

MSMari E. Slater-ParrySMSean T. MeallyPHPeter N. Horton

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Overview

Synthetic study demonstrates cavity wall extensions in heptanuclear metallocalix[6]arenes via ligand functionalization, highlighting structural rearrangement during guest encapsulation attempts.

Key Points

  • Synthesize a new family of heptanuclear pseudo metallocalix[6]arene complexes with extended cavity walls and evaluate their host-guest encapsulation behavior.
  • Modified the upper rim of Schiff base phenol ligands with phenyl (L3H) and tolyl (L4H) substituents.
  • Assembled the functionalized ligands with divalent metal ions (cobalt, nickel, zinc) under coordinating reaction conditions.
  • Attempted host-guest inclusion reactions targeting the encapsulation of fullerene (C60) inside the extended molecular cavities.
  • Isolated four distinct heptanuclear complexes featuring extended cavity walls: [Co(II)7(OMe)6(L3)6](NO3)2, [Ni(II)7(OMe)6(L3)6](NO3)2, [Zn(II)7(OH)2(OMe)4(L3)6](NO3)2, and [Zn(II)7(OMe)6(L4)6](NO3)2.
  • Observed that attempted encapsulation of C60 with the cobalt assembly induced structural transformation, yielding the mixed-valence dimeric complex [Co(II)Co(III)(L3)3(NO3)2] instead of host-guest inclusion.

Cite This Study

Slater-Parry et al. (2026) studied this question.

synapsesocial.com/papers/6aabb8245f706d05830e7bc7https://doi.org/10.3390/inorganics14090242
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