(IUCr) Crystallography Journals Online

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Acta Cryst. (2001). E57, o1100-o1101 [ doi:10.1107/S1600536801017767 ]

Second modification of (E)-2,3,2',3'-tetrahydro-[1,1']biindenylidene

J. Jovanovic, M. Schürmann, H. Preut and M. Spiteller

Abstract: A first crystalline modification of the title compound, C₁₈H₁₆, was published by Schaefer & Abul $\overline{\rm u}$ [Acta Cryst. (1995), C51, 2364-2366]. We now report on a second modification. Both modifications belong to the space group C2/c and, in both, the molecules lie on centres of symmetry. In the first modification, the asymmetric unit contains one half molecule, whereas in the second there are two half-molecules in the asymmetric unit. The two crystallographically independent planar molecules of the second modification are tilted by an angle of 63.4° with respect to one another.

Online 27 October 2001