Nitrosyl-a,/3,7,5-tetraphenylporphinatocobalt(II), ONCoTPP, crystallizes preferentially from solutions in which the six-coordinate ONCoNbTPP [Nb = piperidine) is presumably the most plentiful complexed species. With a square-pyramidal coordination group, but a strongly kinked Co-N-O linkage, the ONCoTPP molecule observes statistically required Co, symmetry in an eightfold-disordered variant of a well-known structural type based on the tetragonal space group, 14/m. Cell data are: a = 13.434, c = 9.754 A; Z = 2; /joaiod = 1.32, readily indicated if we first specify the cobalt porphyrins for which we have obtained definitive stereochemical data. X-Ray analyses of crystalline structure for five cobalt porphyrins derived from the free base, ,ß, , -
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