作者:Ling Li、Chunyan Wang、Jianjian Wu、Yu Chung Tse、Yue-Peng Cai、Keith Man-Chung Wong
DOI:10.1021/acs.inorgchem.5b02147
日期:2016.1.4
A new class of fluorescein/rhodamine hybrids with two spirolactone rings was reported to exhibit dual-output fluorescent behaviors independently. Isolation and characterization for two diastereomers, trans-RhOH and cis-RhOH, have been made and their X-ray crystal structures determined. In a basic environment, the spirolactone ring on the hydroxyl side will be opened to give a fluorescein-like optical
据报道,具有两个螺内酯环的新型荧光素/若丹明杂化体独立显示出双输出荧光行为。分离和鉴定了两个对映异构体,反式- RHOH和顺- RHOH,已经和他们的X射线晶体结构测定。在碱性环境中,羟基侧的螺内酯环将打开,以产生类似于荧光素的光学输出,在485和530 nm发射时具有最低的吸收率。另一方面,通过H +或Hg 2+可以打开类罗丹明类似的光输出,即528 nm的吸收和575 nm的发射。离子,归因于氨基侧螺内酯开环。在具有不同pH值的甲醇缓冲液系统中,相应的羟基和氨基的p K a值分别确定为5.7和2.3。还讨论了选择性的Hg 2+传感特性,确定的log K s值约为3.60和3.73。发现与RhOH孵育的秀丽隐杆线虫的共聚焦显微镜图像显示出具有Hg 2+离子的增强的荧光强度,表明RhOH在体内生物成像中的潜在应用。