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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >On the polymorphism of benzocaine; a lowtemperature structural phase transition for form (II)
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On the polymorphism of benzocaine; a lowtemperature structural phase transition for form (II)

机译:关于苯佐卡因的多态性;形式(II)的低温结构相变

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A low-temperature structural phase transition has been observed for form (II) of benzocaine (BZC). Lowering the temperature doubles the b-axis repeat and changes the space group from P2121 21 to P112 1 with γnow 9.37 °. The structure is twinned, the twin rule corresponding to a 2 1 screw rotation parallel to a. The phase transition is associated with a sequential displacement parallel to a of zigzag bi-layers of ribbons perpendicular to b~*. No similar phase transition was observed for form (I) and this was attributed to the different packing symmetries of the two room-temperature polymorphic forms.
机译:苯并卡因(BZC)的形式(II)观察到低温结构相变。降低温度会使b轴重复次数增加一倍,并将空间组从P2121 21更改为Pnow 1,此时γnow为9.37°。该结构是孪生的,孪生规则对应于平行于a的2 1螺钉旋转。相变与平行于垂直于b 1 *的带的之字形双层的a的顺序位移相关。对于形式(I),未观察到类似的相变,这归因于两种室温多晶型形式的不同堆积对称性。

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