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The creation of modulated monoclinic aperiodic composites in n-alkane/urea compounds

Abstract : n-Dodecane/urea is a member of the prototype series of n-alkane/urea inclusion compounds. At room temperature, it presents a quasi-one dimensional liquid-like state for the confined guest molecules within the rigid, hexagonal framework of the urea host. At lower temperatures, we report the existence of two other phases. Below Tc=248 K there appears a phase with rank four superspace group P61 22(00γ), the one typically observed at room temperature in n-alkane/urea compounds with longer guest molecules. A misfit parameter, defined by the ratio γ=ch/cg (chost/cguest), is found to be 0.632±0.005. Below Tc1=123 K, a monoclinic modulated phase is created with a constant shift along c of the guest molecules in adjacent channels. The maximal monoclinic space group for this structure is P121 1(α0γ). Analogies and differences with n-heptane/urea, which also presents a monoclinic, modulated low-temperature phase, are discussed
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Article Published Online on 2014-09-12

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Céline Mariette, Laurent Guérin, Philippe Rabiller, Yu-Sheng Chen, Alexei Bosak, et al.. The creation of modulated monoclinic aperiodic composites in n-alkane/urea compounds. Zeitschrift für Kristallographie, De Gruyter, 2015, 230 (1), pp.5--11. ⟨10.1515/zkri-2014-1773⟩. ⟨hal-01168329⟩

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