Influence of Alkali Metal Cations on the Photodimerization of Bromo Cinnamates Studied by Solid-State NMR,The Journal of Physical Chemistry C

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Influence of Alkali Metal Cations on the Photodimerization of Bromo Cinnamates Studied by Solid-State NMR
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-12-04 , DOI: 10.1021/acs.jpcc.0c09826
Marufa Zahan ₁ , He Sun ₂ , Sophia E. Hayes ₂ , Harald Krautscheid ₃ , Jürgen Haase ₁ , Marko Bertmer ₁

Affiliation

The alkali metal salts of m-bromocinnamic acid and their photodimerization products are analyzed by solid-state NMR. Cesium, rubidium, and potassium salts show well-resolved signals in the ¹³C CPMAS spectra, whereas for ammonium and sodium salts broader lines are obtained. The (size of the) cation and with that the packing arrangement in the crystal have a significant influence on the resulting spectra. With larger cations the chemical shift different between the two olefinic carbon signals gets smaller. One exception is the potassium salt which also shows a doubling of signals. All samples undergo [2 + 2] photodimerization upon irradiation with UV light to yield truxinates. Cesium, rubidium, and potassium salts show almost complete photoreaction, in contrast to ammonium and sodium salts. Based on the signals for cyclobutane carbons, a nonplanar ring is present in all samples.

中文翻译：

固态NMR研究碱金属阳离子对溴肉桂酸酯光二聚化的影响

的碱金属盐米-bromocinnamic酸和它们的光二产品是由固态NMR分析。铯，rub和钾盐在^13种中显示出良好的信号C CPMAS光谱，而铵盐和钠盐则获得较宽的谱线。阳离子的大小以及晶体中的堆积方式对所得光谱有很大影响。阳离子越大，两个烯烃碳信号之间的化学位移就越小。钾盐是一个例外，它也显示出两倍的信号。所有样品在受到紫外线照射后都会经历[2 + 2]光二聚化，从而产生精氨酸盐。与铵盐和钠盐相比，铯，rub和钾盐显示出几乎完全的光反应。根据环丁烷碳的信号，所有样品中均存在一个非平面环。

更新日期：2020-12-17

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