Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light.,ChemPhysChem

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Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-01-21 , DOI: 10.1002/cphc.201900963
Eduardo Carrascosa ₁ , Christian Petermayer ₂ , Michael S Scholz ₁ , James N Bull _{1,

3} , Henry Dube ₂ , Evan J Bieske ₁

Affiliation

Indigoid chromophores have emerged as versatile molecular photoswitches, offering efficient reversible photoisomerization upon exposure to visible light. Here we report synthesis of a new class of permanently charged hemiindigos (HIs) and characterization of photochemical properties in gas phase and solution. Gas‐phase studies, which involve exposing mobility‐selected ions in a tandem ion mobility mass spectrometer to tunable wavelength laser radiation, demonstrate that the isolated HI ions are photochromic and can be reversibly photoswitched between Z and E isomers. The Z and E isomers have distinct photoisomerization response spectra with maxima separated by 40–80 nm, consistent with theoretical predictions for their absorption spectra. Solvation of the HI molecules in acetonitrile displaces the absorption bands to lower energy. Together, gas‐phase action spectroscopy and solution NMR and UV/Vis absorption spectroscopy represent a powerful approach for studying the intrinsic photochemical properties of HI molecular switches.

中文翻译：

可见光下孤立离子半靛蓝的可逆光开关。

靛蓝发色团已成为多功能分子光开关，在可见光照射下可提供有效的可逆光异构化。在这里，我们报告了一类新型永久带电半靛蓝（HI）的合成以及气相和溶液中光化学性质的表征。气相研究涉及将串联离子淌度质谱仪中的迁移率选择的离子暴露于可调谐波长激光辐射，表明孤立的 HI 离子具有光致变色性，并且可以在Z和E异构体之间可逆地进行光切换。Z和E异构体具有不同的光致异构化响应光谱，最大值相距 40-80 nm，与其吸收光谱的理论预测一致。HI 分子在乙腈中的溶剂化将吸收带转移至较低能量。气相作用光谱、溶液核磁共振和紫外/可见吸收光谱共同代表了研究 HI 分子开关固有光化学性质的强大方法。

更新日期：2020-01-21

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