Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 1 (January 2007)

organic compounds

gg3053 scheme

Acta Cryst. (2007). C63, o73-o76 [ doi:10.1107/S0108270106052668 ]

Secondary interactions in two related terphenyl derivatives: 2',5'-dimethyl-p-terphenyl and 2',5'-bis(bromomethyl)-p-terphenyl

P. G. Jones, A. Zemanek and P. Kus

Abstract: In 2',5'-dimethyl-p-terphenyl, C₂₀H₁₈, which displays pseudosymmetry (the true space group is Pna2₁, but less satisfactory refinement can also be achieved in Pbcn), the molecules are linked into chains by two short C-H [pi] interactions to the centroid of the central ring. In 2',5'-bis(bromomethyl)-p-terphenyl, C₂₀H₁₆Br₂, the polar CH₂Br groups cause molecules to aggregate via C-HBr and BrBr interactions, forming a layer structure, in which the phenyl rings project outwards from the central, more polar, region.

Formula: C₂₀H₁₈ and C₂₀H₁₆Br₂


	Structure factor file (CIF format) (86.5 kbytes) [ doi:10.1107/S0108270106052668/gg3053Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (242.7 kbytes) [ doi:10.1107/S0108270106052668/gg3053IIsup3.hkl ] Contains datablock II

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