2,4,6-Trichlorobenzonitrile crystallizes in the monoclinic space group P21/e with a = 3"97 (1), b = 16.06 (3), c= 12.84 (2) A, and fl= 91"0 (3) °. 2,4,6-Tribromobenzonitrile crystallizes in the monoclinic space group P21/m with a = 8.82 (2), b = 10.34 (2), c= 4-89 (1)/~, and fl= 95.8 (2) °. The structures of both compounds were determined from three-dimensional film data and were refined to conventional R values of 0"134 and 0-089, respectively. Neither molecular structure contains any unusual features. The packing of the molecules in the crystals is dominated by weak Lewis acid-base interactions, CN...X, between the cyanide groups and ortho halogen atoms in a manner reminiscent of the dimerization of carboxylic acids. In the chloro compound these interactions lead to dimers, with CN..-CI distances of 3.22 A. In the bromo compound these interactions lead to infinite chain-like polymers, with CN. • • Br distances of 3.06/~.
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