Crystals of triphenylene are orthorhombic with four molecules in a unit cell of dimensions a = 13.17, b ---16-73, e = 5.26/~, space group P212121. The gross features of the structure, previously determined from two projections, have been confirmed using new three-dimensional data, the positional and isotropic thermal parameters of the carbon atoms have been refined by differential syntheses, and the hydrogen atoms have been located. There are small, but significant, deviations from a completely planar arrange…
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