The dipole moments of cis- and trans-azobenzenes and of some related compounds
The dipole moments of cis- and trans-azobenzenes and of some related compounds
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DOI：
10.1039/jr9390000531
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发表时间：
1939-01-01
期刊：
影响因子：
--
通讯作者：
Le Fevre, RJW
中科院分区：
文献类型：
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作者：
Hartley, GS;Le Fevre, RJW
532 Hartley and Le F2vre：The Dipole Moments of cis-and1.顺式和反式对苯二酚及其在苯溶液中的光化学平衡本节中的测量是用我们之一制备的顺式和反式偶氮苯样品进行的（Hartley，Nature，1937，140，281; J.，1938年，第633页）。有关细节和mp的，第二个参考可以查阅。有趣的是，在顺式异构体被发现之前，Bergmann，Engel和Sandor（Bey.，1930年，63，2572），同意与（A）中列出的测量，尽管这些作者没有提到任何预防措施，对轻。我们在普通实验室条件下的工作总是导致这样的结果，即（B）中的三个是样本。这一点是以前评论的主题（Chew。和印第安纳州，1938，57，255）。在表I1中给出了由段落（A）-（D）中的图表示的表观偶极距值，以及两种形式的偶氮苯的畸变极化的估计值67 CC。这个数字是从上面第一组测量中获得的总偏振中得出的，因此应该包括比Na-D线折射更全面的原子偏振校正-记录的值都更低：撕裂，1911，153，875）给出Li线的[RL]，h= 670.5，为62.28 CC; Auwers和Heimke（Bey.，1928，61，1030）给出d？，8.10 1.0362和n = 1 * 1.62662，因此[RL 10]为62.22 CC;最近，Auwers（Ber.，1938，71，611）分别报道了顺式和反式偶氮苯在喹啉和α-甲基萘中的溶液[RLID 59-40 CC和63-64 CC。从适当的原子折射和本构折射的总和计算的折射为57 CC量级（Auwers，Zoc.前引，1938年）。如果对顺式偶氮苯采用63 cc而不是67 cc的畸变极化，则p从3-02提高到3.05。表11.
532 Hartley and Le F2vre: The Dipole Moments of cis-and1. cis-and trans-Axobenzenes and their Photochemical Equilibrium in Benzene Solution.-The measurements in this section were made with specimens of cis-and trans-azobenzene prepared by one of us (Hartley, Nature, 1937, 140, 281; J., 1938, 633). For details and mp's, the second reference may be consulted. It is of interest that the earlier dipole-moment determinations for azobenzene, made, before the cis-isomeride was discovered, by Bergmann, Engel, and Sandor (Bey., 1930, 63, 2572), agree well with the measurements set out in (A), notwithstanding that these authors do not mention any precautions against light. Our work under ordinary laboratory conditions has always led to results of which the three in (B) are samples. This point has been the subject of previous comment (Chew. and Ind., 1938, 57,255). In Table I1 are given the apparent dipole-moment values indicated by the figures of paragraphs (A)-(D), combined with an estimate of 67 CC for the distortion polarisation of both forms of azobenzene. This figure is taken from the total polarisations obtained in the first set of measurements above, and should therefore include a fuller correction for atomic polarisation than would the Na-D line refraction-the recorded values for which are all lower: Duval (Compt. rend., 1911, 153, 875) gives [RL] for the Li line, h= 670.5, as 62.28 CC; Auwers and Heimke (Bey., 1928, 61, 1030) give d?, 8.10 1.0362 and n~*'l* 1.62662, whence [RLI0 is 62.22 CC; recently, Auwers (Ber., 1938, 71, 611) has reported for solutions of cis-and trans-azobenzenes in quinoline and a-methylnaphthalene [RLID 59-40 CC and 63-64 CC respectively. The refraction calculated from the sum of the appropriate atomic and constitutive refractions is of the order 57 CC (Auwers, Zoc. cit., 1938). If a distortion polarisation of 63 cc-instead of 67 cc-is taken for cis-azobenzene, p is raised from 3-02 to 3.05. TABLE 11.