trans-afl-Dicyanostilbene, C6H5. C(C:N) : C(CN). C6I:I 5, forms monoclinic crystals, space group 02/c, with a unit cell of dimensions a=17.98+_0-05, b=3.96+_0.02, c =17.23 _+ 0.05 A, fl=91_+0"5 , containing 4 molecules. The molecular structure, derived from Fourier projections along each of the three crystallographic axes, is non-planar. Approximate molecular dimensions are given and discussed in terms of conjugation.
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S. C. Wallwork (1961) studied this question.
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