首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >From space group to space groupoid: the partial symmetry of low-temperature E-vanillyl oxime
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From space group to space groupoid: the partial symmetry of low-temperature E-vanillyl oxime

机译:从太空组到空间Galoid:低温E-VanillyL肟的部分对称性

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The phase transition of E-vanillyl oxime {1-[(E)-(hydroxyimino)methyl]-4- hydroxy-3-methoxybenzene, C_8H_9NO_3} has been analysed by single-crystal and powder X-ray diffraction. The high-temperature (HT) phase (P2_1/a, Z' = 1) transforms into the low-temperature (LT) phase (threefold superstructure, P1, Z' = 6) at ca 190 K. The point operations lost on cooling, {m_([010]), 2_([010])}, are retained as twin operations and constitute the twin law. The screw rotations and glide reflections are retained in the LT phase as partial operations acting on a subset of Euclidean space E~3. The full symmetry of the LT phase, including partial operations, is described by a disconnected space groupoid which is built of three connected components.
机译:通过单晶和粉末X射线衍射分析了E-VANILLYL肟{1 - [(氢咪酯 - (羟基咪啶)甲基氧基,C_8H_9NO_3}的相转变。 高温(HT)相(P2_1 / A,Z'= 1)在CA 190 K的低温(LT)相(三倍上层建筑,P1,Z'= 6)中变换。在冷却时损失的点操作 ,{M _([010]),2 _([010])}被保留为双行动并构成双单法。 螺杆旋转和滑动反射被保留在LT相中,作为作用在欧几里德空间E〜3的子集上的部分操作。 LT阶段的完整对称性包括部分操作,由断开的空间Galoid描述,该空间集团由三个连接的组件构成。

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