Abstract
The crystal structure of the cis-dimer of acenaphthylene, C24H16, has been determined by three-dimensional X-ray analysis (R=0-070 for 950 reflexions). The space group is monoclinic P21/c with a= 11-966 (5), b= 13.930 (5), c= 10.003 (3)/~ t = 1077 (1), Z=4, Dx= 1.24, Dm= 126 g.cm-3. The bond lengths in the naphthalene rings are not significantly different from those in naphthalene itself or acenaphthene. The cyclobutane single bonds of 1.56/~ are greater than a normal single bond. The molecular symmetry deviates from mm2 by a small but significant amount. A large ring-bending amplitude of vibration of the cyclobutane ring is indicated by the analysis of thermal parameters. All measurements were at 22°C.
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