improve the photon output of these molecules, we report a synthetic strategy that blocks the major deactivation pathway: excited-state trans-to-cis polyene rotation. In the key transformation, a protected dialdehyde precursor undergoes a cascade reaction to install the requisite tetracyclic ring system. The resulting molecules exhibit the characteristic features of conformational restraint, including
尽管量子产率适中,但远红
花青荧光团在现代显微镜中得到了广泛的应用。为了提高这些分子的光子输出,我们报告了一种阻止主要失活途径的合成策略:激发态反式到顺式多烯旋转。在关键转变中,受保护的二醛前体经历级联反应以安装必需的四环系统。由此产生的分子表现出构象限制的特征,包括提高的荧光量子产率和延长的寿命。此外,这些化合物从
氢化物还原中恢复,效率显着提高。这些观察结果能够在不添加
硫醇的情况下在含氧缓冲液中进行有效的单分子定位显微镜检查。通过现代有机合成,