Photoswitchable Intramolecular Hydrogen Bonds in 5-Phenylazopyrimidines Revealed By In Situ Irradiation NMR Spectroscopy.
Photoswitchable Intramolecular Hydrogen Bonds in 5-Phenylazopyrimidines Revealed By In Situ Irradiation NMR Spectroscopy.
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原位辐照核磁共振波谱揭示 5-苯基氮杂嘧啶中的光可切换分子内氢键
DOI:
10.1002/chem.201705146
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
M. Dračínský
中科院分区:
文献类型:
--
作者:
E. Procházková;L. Čechová;J. Kind;Z. Janeba;C. M. Thiele;M. Dračínský
NMR spectroscopy within situirradiation uncovered unique photoswitchable intramolecular hydrogen bonds (IMHBs) in 5‐phenylazopyrimidines with two hydrogen bond donors. These compounds form two stable rotamers, each with one IMHB, and the rotamer ratio changes reversibly upon UV or visible light irradiation. Strong substituent dependence of photoinduced structural changes was observed; using suitable substituents, orthogonal photoswitching can be achieved. For example, whereas UV irradiation caused switching between the two rotamers of thetransisomer of a compound with electron‐donating methoxy substituent, visible light enabled to obtain thecisphotoisomer. Nocisisomer was detected for compounds with electro‐neutral or electron‐accepting substituents, but photoswitching between the twotransisomers was observed. On the other hand, compounds without hydrogen‐bond donors or with one donor only formed stablecisisomers. A mechanism of the photoswitching was proposed by DFT computations.
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