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SummaryBased on 5-(4-hydroxyphenyl)-2-octylpyrimidine 8, 5-phenylpyrimidine derivatives 3–7, 9 with different spacer chain lengths (C2 up to C6) and different terminal polar groups (Br, Cl, N3, OH, CN) were synthesized by etherification and nucleophilic substitution. The mesomorphic behaviour of these compounds was investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (WAXS and SAXS) and revealed smectic A mesophases for bromides, chlorides and azides 3, 4 and 6. For these compounds a maximum phase width was observed for the C5 spacer regardless of the terminal group, whereas the hydroxy- and cyano-substituted derivatives 5 and 7, respectively, were non mesomorphic and showed only melting transitions.

Rare‐earth(III) oxotellurates(IV) with the composition M2Te4O11 are known for yttrium and all lanthanides except promethium and lutetium from single‐crystal X‐ray structure determinations. Single crystals of the last missing non‐radioactive isostructural compound, Lu2Te4O11, can now be obtained by modifying the common method of synthesis from the binary oxides (Lu2O3 and TeO2; 1:4 molar ratio) using torch‐sealed non‐evacuated silica ampoules as reaction containers. The structure contains layers of edge‐sharing [LuO8] polyhedra connected by oxotellurate(IV) chains. These consist of [TeO3]2− and [Te2O5]2− anions (with ψ1‐tetra­hedral oxygen coordination for all central Te4+ cations) linked by strong secondary Te—O inter­actions.