Influence of Alkali Metal Cations on the Photodimerization of Bromo Cinnamates Studied by Solid-State NMR
Influence of Alkali Metal Cations on the Photodimerization of Bromo Cinnamates Studied by Solid-State NMR
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固态核磁共振研究碱金属阳离子对溴代肉桂酸酯光二聚反应的影响
DOI:
10.1021/acs.jpcc.0c09826
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Bertmer, Marko
中科院分区:
文献类型:
--
作者:
Zahan, Marufa;Sun, He;Hayes, Sophia E.;Krautscheid, Harald;Haase, Jürgen;Bertmer, Marko
The alkali metal salts ofm-bromocinnamic acid and their photodimerization products are analyzed by solid-state NMR. Cesium, rubidium, and potassium salts show well-resolved signals in the13C 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.
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DOI:
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发表时间:
1987
期刊:
影响因子:
--
作者:
S. Akabori;Y. Habata;M. Nakazawa;Yoko Yamada;Y. Shindo;T. Sugimura;Sadao. Sato
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2006
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B. Kariuki
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1975
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作者:
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M. D. Cohen
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1992
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作者:
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通讯作者:
T. Matsuda
影响因子:
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作者:
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通讯作者:
T. Bräuniger