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Secondary Bonding Interactionsi in Some Di- and Trihaloanilinium Halides

  • Esperanza López-Duplá , Peter G. Jones EMAIL logo and Fabiola Vancea
Published/Copyright: June 2, 2014
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Abstract

Six solvent-free structures of di- and trihaloanilinium halides are presented. All involve clearly defined hydrophilic regions built up from classical hydrogen bonding systems. The 2,4-dibromo-, 2,6- dichloro-, 2,4,6-trichloro- and 2,4,6-tribromoanilinium derivatives form ribbon structures involving annelated R24 (8) rings with NH2 donors (two hydrogens from the positively charged NH3 groups) and halide acceptors. The 2,5-dibromo- and 2,4,5-trichloro derivatives form layers with two types of ring, R24 (8) and R48 (16). All structures also involve other secondary interactions (C-H. . . X hydrogen bonds and/or X. . . X contacts, X = halogen), some of which link the ribbons or layers into a second or third dimension. The shortest X. . . X contacts generally involve the anions. In the 2,4-dibromo, 2,4,6-trichloro and tribromo derivatives, somewhat more extensive halogen aggregates (triangles, angled X3 or X4 chains) are formed between neutral halogens. In two appendices, the packing patterns of (I) the disordered structure 3,4,5-trichloroanilinium chloride and (II) the known structures of unsubstituted anilinium halides are briefly presented.

Received: 2002-10-18
Published Online: 2014-6-2
Published in Print: 2003-1-1

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