Allosterically Regulated Guest Binding Determines Framework Symmetry for an Fe^II ₄ L₄ Cage.

ABSTRACT: Self-assembly of a flexible tritopic aniline and 3-substituted 2-formylpyridine subcomponents around iron(II) templates gave rise to a low-spin Fe^II ₄ L₄ capsule, whereas a high-spin Fe^II ₃ L₂ sandwich species formed when a sterically hindered 6-methyl-2-formylpyridine was used. The Fe^II ₄ L₄ cage adopted a new structure type with S₄ symmetry, having two mer-Δ and two mer-Ʌ metal vertices, as confirmed by NMR and X-ray crystallographic analysis. The flexibility of the face-capping ligand endows the resulting Fe^II ₄ L₄ framework with conformational plasticity, enabling it to adapt structurally from S₄ to T or C₃ symmetry upon gu

SUBMITTER: Xue W 

PROVIDER: S-EPMC10947561 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature