Abstract
The structure has been refined by the least-squares method. The final R value is 13.1% and the standard deviations are of the order of 0.001 A for the bromine atoms and 0.008 ~ and 0-01/1, for the nitrogen and carbon atoms respectively. The molecular system is non-conjugated: the central carbon atom is clearly a CH2 group connected with C-C bonds of 1.51 A to the quinoline rings. The C-CH2-C valency angle is 111.5 ° and the dihedral angle between the two planar quinoline rings is 77 °. The observed red colour of the crystals is not in agreement with the firmly established non-planar conformation. It is assumed that the structure is an example of an anomalous mixed crystal in such a way that a small proportion of planar molecules, viz. the tautomer BrNHC9Hs:CH. C9HsNBr, is present in the lattice.
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