Acta Crystallographica Section C

Volume 65, Part 9 (September 2009)

organic compounds

gd3300 scheme

Acta Cryst. (2009). C65, o447-o452 [ doi:10.1107/S0108270109030753 ]

Unsolvated 5,10,15,20-tetra-4-pyridylporphyrin, its sesquihydrate and its 2-chlorophenol disolvate: conformational versatility of the ligand

S. Lipstman and I. Goldberg

Abstract: Unsolvated 5,10,15,20-tetra-4-pyridylporphyrin, C₄₀H₂₆N₈, (I), its sesquihydrate, C₄₀H₂₆N₈·1.514H₂O, (II), and its 2-chlorophenol disolvate, C₄₀H₂₆N₈·2C₆H₅ClO, (III), reveal different conformational features of the porphyrin core. In (I), the latter is severely deformed from planarity, apparently in order to optimize the intermolecular interactions and efficient crystal packing of the molecular entities. The molecular framework has a C₁ symmetry. In (II), the porphyrin molecules are located on $\overline{4}$ symmetry axes, preserving the marked deformation from planarity of the porphyrin core. The molecular units are interlinked into a single-framework supramolecular architecture by hydrogen bonding to one another via molecules of water, which lie on twofold rotation axes. In (III), the porphyrin molecules are located across centres of inversion and are characterized by a planar conformation of the 24-membered macrocyclic porphyrin ring. Two trans-related pyridyl substituents are hydrogen bonded to the 2-chlorophenol solvent molecules. The interporphyrin organization in (III) is similar to that observed for many other tetraarylporphyrin compounds. However, the organization observed in (I) and (II) is different and of a type rarely observed before. This study reports for the first time the crystal structure of the unsolvated tetrapyridylporphyrin.

Formula: C₄₀H₂₆N₈, C₄₀H₂₆N₈·1.514H₂O and C₄₀H₂₆N₈·2C₆H₅ClO


	Structure factor file (CIF format) (169.5 kbytes) [ doi:10.1107/S0108270109030753/gd3300Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (51.9 kbytes) [ doi:10.1107/S0108270109030753/gd3300IIsup3.hkl ] Contains datablock II

	Structure factor file (CIF format) (236.8 kbytes) [ doi:10.1107/S0108270109030753/gd3300IIIsup4.hkl ] Contains datablock III

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