Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 10 (October 2002)

Acta Cryst. (2002). C58, o624-o628 [doi:10.1107/S010827010201627X]

(E)-(4-Hydroxyphenyl)(4-nitrophenyl)diazene, (E)-(4-methoxyphenyl)(4-nitrophenyl)diazene and (E)-[4-(6-bromohexyloxy)phenyl\](4-cyanophenyl)diazene

X.-J. Huang, G. H. Kuhn, V. N. Nesterov, B. B. Averkiev, B. Penn, M. Yu. Antipin and T. V. Timofeeva

Abstract: Syntheses and X-ray structural investigations have been carried out for (E)-(4-hydroxyphenyl)(4-nitrophenyl)diazene, C₁₂H₉N₃O₃, (Ia), (E)-(4-methoxyphenyl)(4-nitrophenyl)diazene, C₁₃H₁₁N₃O₃, (IIIa), and (E)-[4-(6-bromohexyloxy)phenyl](4-cyanophenyl)diazene, C₁₉H₂₀BrN₃O, (IIIc). In all of these compounds, the molecules are almost planar and the azobenzene core has a trans geometry. Compound (Ia) contains four and compound (IIIc) contains two independent molecules in the asymmetric unit, both in space group P $\overline 1$ (No. 2). In compound (Ia), the independent molecules are almost identical, whereas in crystal (IIIc), the two independent molecules differ significantly due to different conformations of the alkyl tails. In the crystals of (Ia) and (IIIa), the molecules are arranged in almost planar sheets. In the crystal of (IIIc), the molecules are packed with a marked separation of the azobenzene cores and alkyl tails, which is common for the solid crystalline precursors of mesogens.

Formula: C₁₂H₉N₃O₃, C₁₃H₁₁N₃O₃ and C₁₉H₂₀BrN₃O

Online 30 September 2002


	Structure factor file (CIF format) (596.8 kbytes) Contains datablock Ia

	Structure factor file (CIF format) (117.0 kbytes) Contains datablock IIIa

	Structure factor file (CIF format) (481.4 kbytes) Contains datablock IIIc

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