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nickel(II) 0. 5dichloromethane solvate) form isostructural crystals. There is significant distortion from planarity of the porphyrin ring caused by the octabromo substituents interacting with the meso-pentafluorophenyl groups and with each other, with departures of the Br atoms from the plane defined by the four N atoms of up to 2.36 A. This tetrahedral distortion of the molecule does not result in any significant changes in bond distances from those in non-halogenated tetraphenylporphyrin complexes. t Contribution No. 8624.

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The title compound, {4,5,9,10,14,15,l9,20-octabromo-2,7,12,17-tetrakis(pentafluorophenyl)-21,22,23,-24-tetraazapentacyclo[l 6.2. l ]tetracosa-1,3(21), 4,6,8(22),9,11, 13(23), 14, 16, 18(24), 19-dodecaene }zinc( II) (carbon tetrachloride, o-dichlorobenzene, acetone, methanol, water solvate) has a large tetrahedral distortion, with the Br atoms as much as The Zn complex was synthesized by published procedures (Lyons & Ellis, 1991) and attempts were made to grow crystals by evaporation and/or solvent diffusion from acetone, methanol, dichloromethane and mixtures of these. Solid materials formed, but no good crystals were found, and the solids were dissolved in new solvent without purification. A satisfactory crystal was finally obtained by evaporation over several weeks at 277 K from a solution in o-dichlorobenzene and carbon tetrachloride.The material crystallizes with the porphyrin plane perpendicular to a crystallographic mirror plane that includes Nl, Zn and N3. Fig. 1 is a drawing