The crystalline structure of anthracene. A quantitative X-ray investigation
The crystalline structure of anthracene. A quantitative X-ray investigation
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蒽的晶体结构。
DOI：
10.1098/rspa.1933.0197
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发表时间：
1933
期刊：
影响因子：
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通讯作者：
J. Robertson
中科院分区：
文献类型：
--
作者：
J. Robertson
水晶数据。萘，-C10H8熔点80°C密度1·152(计算。1·172)。单斜棱柱型，a=8.29，b=5.97，c=8.68A，β=122.7°。空间群C2λ5(P21/a)。每个单位细胞有两个分子。分子对称性，居中。分子体积，362A3.每单位晶胞的电子总数=F(000)=136。实验-强度测量。当一个小的单晶被完全放置在X射线束中时，如果晶体的质量足够小，那么积分反射与晶体的质量成正比。虽然可以很容易地获得相当大的萘晶体，但这项工作的目的是在足够小的样品上进行测量，以使这种比例保持良好。对于碳氢化合物类型的软有机晶体，可靠的结果所需的大小被发现在0.1毫克左右。
Crystal Data . Naphthalene .—C10H8. Melting point 80° C. Density 1·152 (calc. 1·172). Monoclinic prismatic, a = 8·29, b = 5·97, c = 8·68 A., β = 122·7°. Space group C2λ5 (P21/ a ). Two molecules per unit cell. Molecular symmetry, centre. Molecular volume, 362 A3. Total number of electrons per unit cell = F(000) = 136. Experimental—Measurements of Intensities . When a small single crystal is placed completely in an X-ray beam, the integrated reflection is proportional to the mass of the crystal, if the latter is sufficiently small. Although fairly large crystals of naphthalene can easily be obtained, the aim in this work has been to carry out the measurements on specimens small enough for this proportionality to hold good. With soft, organic crystals of the hydrocarbon type, the size required for reliable results is found to be of order of 0·1 milligrams.