Mehta, G. ; Vanessa, G. ; Islam, K. ; Venkatesan, K. (2004) 6a,6b,12a,12b-Tetrahydrocycloocta[3,4]cyclobuta[1,2][8]annulene Acta Crystallographica Section C: Crystal Structure Communications, C60 (1). o90-o93. ISSN 0108-2701

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Official URL: http://scripts.iucr.org/cgi-bin/paper?ln1180

Related URL: http://dx.doi.org/10.1107/S0108270103024181


The cis,syn,cis-tricyclic [2+2]-dimer of cyclooctatetraene, C16H16, crystallizes in space group Pca21 with two molecules in the asymmetric unit. An extensive network of weak C-H...π(C=C) interactions between the two independent molecules, A and B, as well as A..A and B..B interactions, are observed in the supramolecular assembly. The C-H groups point more towards one C atom than to the centre of the C=C bond. Notable among the interactions are bifurcated (cyclobutane)C-HC=C contacts that span transannularly the eight-membered ring.

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