The structure of 2,3,7,8,12,13,17,18-octaethyl-5,10,15,-20-tetraphenylporphyrin(2+) diacetate acetic acid dichloromethane solvate, C60H64N42+.2C2H3O2-.3C2H4-O2.CH2CI2, has been determined at 200K. The molecule is severely non-planar and adopts an $4 saddle shape. It is the most distorted member of the OETPP series reported to date, with displacements of the β- pyrrole C atoms from the plane of the four N atoms as great as 1.42 Å, and acute tilts of the phenyl rings relative to the porphyrin plane. The two acetate counterions act as bidentate ligands which bond to the H atoms on opposite pairs of N atoms. The crystal lattice also contains three acetic acid molecules of solvation per porphyrin molecule, all of which are involved in hydrogen bonds to the acetate molecules. An 'innocent' molecule of CH2CI2 is also present.



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