STRUCTURAL STUDIES OF POLYESTERS .5. MOLECULAR AND CRYSTAL-STRUCTURES OF OPTICALLY-ACTIVE AND RACEMIC POLY(BETA-HYDROXYBUTYRATE)
STRUCTURAL STUDIES OF POLYESTERS .5. MOLECULAR AND CRYSTAL-STRUCTURES OF OPTICALLY-ACTIVE AND RACEMIC POLY(BETA-HYDROXYBUTYRATE)
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DOI：
10.1016/0032-3861(73)90087-6
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发表时间：
1973-01-01
期刊：
影响因子：
4.6
通讯作者：
TANI, H
中科院分区：
文献类型：
--
作者：
YOKOUCHI, M;CHATANI, Y;TANI, H
用X射线衍射法分析了天然光学活性聚β-羟基丁酸酯的分子和晶体结构。晶胞为正交晶系，P2 1 2 1 2 1-D 4 2，a= 5· 76 A/cm，B= 13· 20 A/cm，c（纤维周期）= 5· 96 A/cm，两个分子通过晶胞。该分子具有由费歇尔投影所示的直肌聚合物的情况下，给出左手（2 - 1）螺旋的构象。结晶合成的外消旋聚合物给出了与天然存在的光学活性聚合物相同的X射线衍射图。该结果表明，外消旋聚合物具有全同立构构型，并且由两种微晶组成，每种微晶仅由直链聚合物链的左手螺旋组成，或者仅由左链聚合物链的右手螺旋组成。
The molecular and crystal structure of naturally occurring optically active poly (β-hydroxy-butyrate) was analysed by X-ray diffraction. The unit cell is orthorhombic, P2 1 2 1 2 1-D 4 2, with a= 5· 76 A ̊, b= 13· 20 A ̊, and c (fibre period)= 5· 96 A ̊ and two molecules pass through the unit cell. The molecule has a conformation shown by the Fischer projection for the case of a rectus polymer, giving a left-handed (2 1) helix. The crystalline synthesized racemic polymer gave the same X-ray diffraction pattern as the naturally occurring optically active polymer. This result indicates that the racemic polymer has an isotactic configuration and consists of two kinds of crystallites, each composed only of the left-handed helices of rectus polymer chains, or only of the right-handed helices of sinister polymer chains.