Thermally Induced
<i>trans</i>
‐to‐
<i>cis</i>
Isomerization and Its Photoinduced Reversal Monitored using Absorption and Luminescence: Cooperative Effect of Metal Coordination and Steric Substituent
作者:Jun‐Quan Zhang、De‐Shan Zhang、Qiu‐Jie Chen、Hai‐Bing Xu、Mohamedally Kurmoo、Ming‐Hua Zeng
DOI:10.1002/chem.201900204
日期:2019.4.5
its progressive cis‐to‐trans reversal upon irradiation with UV light, which was confirmed by powder X‐ray diffraction (PXRD). Similar results observed in the series of (cis‐L2)MIICl2 [M=Fe (4), Co (5), Ni (6)] demonstrate the universal strategy. The results of PXRD, NMR spectroscopy, ESI‐MS and DFT calculations support the above conclusion. NMR spectroscopy indicates that irradiation of 1 converts an
对于具有较大基团的乙烯衍生物,顺式异构体通常非常不稳定且不可用。在本文中,我们报道了两个稳定的配位化合物(cis - L)ZnCl 2的例外,其始于反式1,2-双(1-R-苯并[ d ]咪唑-2-基)乙烯(R = H,L1 ; R = CH 3,L2)溶剂热条件下配位体(Ť ≥140℃)。利用吸收和发光光谱强度作为探针,我们建议将其逐步顺至-反式紫外光照射后会发生逆转,这可以通过粉末X射线衍射(PXRD)确认。在(cis - L2)M II Cl 2系列中观察到的相似结果[M = Fe(4),Co(5),Ni(6)]证明了通用策略。PXRD,NMR光谱,ESI-MS和DFT计算的结果支持上述结论。NMR光谱表明的照射1个转换的优化的71%顺式异构体,以反式,而自由反式- L1配体变换来只有15%的顺式相似条件下的异构体。