Crystal‐smectic E mesophases in a series of 2‐(4‐n‐alkylphenyl)indenes

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• Single crystals of 3f were obtained from a concentrated heptane solution at room temperature. Formula C20H22, M = 262.38, colourless crystal 0.25×0.20×0.03 mm, triclinic, space group P1bar (No. 2), a = 9.291(1), b = 18.725(1), c = 18.855(1) Å, α = 103.50(1), β = 93.18(1), γ = 99.49(1)°, V = 3130.9(4) Å3, ρcalc = 1.113 g cm−3, Z = 8, empirical absorption correction (0.893⩽T⩽0.986), CuKα radiation, λ = 1.54178 Å, T = 223 K, ω and ϕ scans, 35 206 reflections collected (±h, ±k, ±l), [(sin θ)/λ] = 0.58 Å‐1, 9752 independent (Rint = 0.106) and 5808 observed reflections [I⩾2 σ(I)], 725 refined parameters, μ = 0.463 mm−1, R = 0.088, wR2 = 0.258, max. residual electron density 0.31 (−0.25) e Å−3, hydrogen atoms calculated and refined as riding atoms, crystals of poor quality leads to an analysis of limited accuracy. The data set was collected with a Nonius KappaCCD diffractometer. Programs used: data collection COLLECT (Nonius BV, 1998); data reduction Denzo‐SMN [Z. Otwinowski, W. Minor. Meth. Enzymol., 276, 307 (1997)]; absorption correction Denzo [Z. Otwinowski, D. Borek, W. Majewski, W. Minor. Acta crystallogr. A, 59, 228 (2003)]; structure solution SHELXS‐97 [G.M. Sheldrick. Acta crystallogr. A, 46, 467 (1990)]; structure refinement SHELXL‐97 [G.M. Sheldrick. Universität Göttingen (1997)]; graphics SCHAKAL [E. Keller. Universität Freiburg (1997)]. CCDC‐283145 contains the supplementary crystallographic data for this paper that can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif
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