A new “dual-mode” chromogenic and fluorescent turn-on probe (2) for the selective sensing of biological thiols is reported. In MeOH–H2O cosolvent at physiological pH 7.40 (MeOH–H2O = 3:7), biological thiols cleave the 2,4-dinitrobenzenesulfonyl group to release the chromo- and fluorophore merocyanine (3).
A highly selective merocyanine-based fluorescent probe was developed, which can significantly distinguish Cys from Hcy and GSH by their kinetic profiles in water and respond to the intracellular Cys.
multi‐state and multi‐stimuli‐responsive oxazine molecular switch that combines an electro‐base property and sensitive base/acid‐responsive properties was designed and synthesized. The multi‐state structures of the molecular switch, with different colors, were predicted by comparing the optical properties with reference molecules and confirmed by using NMR spectroscopy. The color‐switching mechanism under stimulation
设计并合成了一种具有电基性质和敏感的碱/酸响应特性的多状态,多刺激响应的恶嗪分子开关。通过将光学特性与参考分子进行比较,可以预测具有不同颜色的分子开关的多态结构,并通过NMR光谱法进行确认。利用DFT计算研究了在酸和碱刺激下的颜色转换机制。可以得到三个单一状态,并且在酸和碱刺激下该切换是单向的。证明了分子开关的电致变色现象,结合了其电基性和碱敏性。2 C -1)的构建成功。
Synthesis and properties of molecular switches based on the opening and closing of oxazine rings
作者:Erhan Deniz、Janet Cusido、Subramani Swaminathan、Mutlu Battal、Stefania Impellizzeri、Salvatore Sortino、Françisco M. Raymo
DOI:10.1016/j.jphotochem.2011.11.008
日期:2012.2
molecular switches each pairing an oxazine ring to a chromophoric fragment. Under the influence of either chemical or optical stimulations, the oxazine ring opens to bring the chromophoric appendage in conjugation with either a 3H-indolium cation or a phenolate anion. These structural transformations alter the electronic structure of the chromophore and, as a result, its electrochemical and spectroscopic signatures