Acta Cryst. (2009). C65, o248-o252 [ doi:10.1107/S0108270109013456 ]
Abstract: In 1,3,5-triphenyladamantane, C28H28, (I), and 1,3,5,7-tetraphenyladamantane, C34H32, (II), the molecules possess symmetries 3 and , and are situated across threefold and fourfold improper axes, respectively. The molecules aggregate by means of extensive C-H interactions. In (I), the pyramidal shape of the molecules dictates the formation of dimers through a `sixfold phenyl embrace' pattern. The dimers are linked to six close neighbors and constitute a primitive cubic net [H = 2.95 (2) and 3.02 (2) Å]. Compound (II) is isomorphous with tetraphenyl derivatives EPh4 of group 14 (E = C-Pb) and ionic salts [EPh4][BPh4] (E = P, As and Sb). The multiple C-H interactions arrange the molecules into chains, with a concerted action of CH (phenyl) and CH2 (adamantane) groups as donors [H = 3.15 (2) and 3.44 (2) Å, respectively]. The additional interactions with the methylene groups (four per molecule) are presumably important for explaining the high melting point and insolubility of (II) compared with the EPh4 analogs.
Formula: C28H28 and C34H32
Structure factor file (CIF format) (65.4 kbytes)
Structure factor file (CIF format) (40.1 kbytes)
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