Crystalline Materials with Large Channels or Cavities – Synthesis and Crystal Structure of an Iron(III) tetra(4‐carboxyphenyl)‐porphine

Tetra(4‐carboxyphenyl)‐porphine iron(III) chloride · 2 CH₃COOH · 4 H₂O ( 1 ) was prepared via a hydrothermal synthesis approach starting from FeCl₂ and 5,10,15,20‐tetrakis‐(4‐carboxyphenyl)‐21 H,23 H‐porphine in glacial acetic acid in the presence of KOH as a base and ytterbium(III) acetate as a template. Compound 1 was characterized by single crystal X‐ray diffraction and elemental analysis. Space group: P 1, Z = 2, unit cell dimensions at 200 K: a = 9.282(2), b = 20.239(5), c = 22.239(5) Å, α = 92.49(3), β = 99.87(3), γ = 90.78(3)°, R₁ (observed) = 0.132, wR₂ (all data) = 0.395. The architecture of the structure is determined by interporphyrin hydrogen bonding. Four iron porphyrin units form a very wide open channel with dimensions of circa 15.7 Å × 15.7 Å. No interpenetrating is observed.