Anilinomethylrhodamines: pH Sensitive Probes with Tunable Photophysical Properties by Substituent Effect
摘要:
A series of pH dependent rhodamine analogues possessing an anilino-methyl moiety was developed and shown to exhibit a unique photophysical response to pH. These anilinomethylrhodamines (AnMR) maintain a colorless, non-fluorescent spirocyclic structure at high pH. The spirocyclic structures open in mildly acidic conditions and are weakly fluorescent; however, at very low pH, the fluorescence is greatly enhanced. The equilibrium constants of these processes show a linear response to substituent effects, which was demonstrated by the Hammett equation.
Design and characterization of pH-sensitive spirorhodamine 6G probes with aliphatic substituents
作者:Matías Di Paolo、Fernando M. Boubeta、Julieta Alday、Mateo Michel Torino、Pedro F. Aramendía、Sebastian A. Suarez、Mariano L. Bossi
DOI:10.1016/j.jphotochem.2019.112011
日期:2019.11
amide N-aliphatic substituents, including measurements of single-crystal X-ray structures, fluorescence emission, and quantum mechanical calculations. Variations in the equilibrium position between closed and open states, a transition that is catalysed under acidicconditions, of several SRAs sharing the same central chromophore (Rhodamine 6G) were measured. For the different substituents in the lactam
Anilinomethylrhodamines: pH Sensitive Probes with Tunable Photophysical Properties by Substituent Effect
作者:Quinn A. Best、Chuangjun Liu、Paul D. van Hoveln、Matthew E. McCarroll、Colleen N. Scott
DOI:10.1021/jo401323g
日期:2013.10.18
A series of pH dependent rhodamine analogues possessing an anilino-methyl moiety was developed and shown to exhibit a unique photophysical response to pH. These anilinomethylrhodamines (AnMR) maintain a colorless, non-fluorescent spirocyclic structure at high pH. The spirocyclic structures open in mildly acidic conditions and are weakly fluorescent; however, at very low pH, the fluorescence is greatly enhanced. The equilibrium constants of these processes show a linear response to substituent effects, which was demonstrated by the Hammett equation.
Highly Sensitive and Selective Turn-on Fluorescent Probe for Hg2+ Based on Rhodamine 6G-Thiourea Conjugate
作者:Ying-Zi Ding、Hui-Li Gong、Kun-Peng Wang
DOI:10.1007/s10895-017-2044-z
日期:2017.5
An easily available novel fluorescent probe based on rhodamine 6G–thiourea conjugate (RGTU) has been synthesized. Upon mixed with Hg2+ in CH3CN–H2O (1:9, v/v), the dramatic enhancement of fluorescence intensity as well as the color change of the solution were observed. The presence of common coexisting alkali, alkaline earth, and transition metal ions showed small or no interference with the detection