Solvent-dependent "turn-on" fluorescence chemosensor for Mg(2+) based on combination of C=N isomerization and inhibition of ESIPT mechanisms.
A fluorescent chemosensor (L) for Mg(2+) has been synthesized and characterized, which exhibits turn-on fluorescence response for Mg(2+) only in alcohol solvent (methanol or ethanol) with high sensitivity and selectivity. But in both nonpolar and polar solvents (cyclohexane, DCM, DMSO or MeCN), L showed negligible fluorescent response for Mg(2+). In order to discover the unique phenomenon, optical measurements, liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) and a high performance liquid chromatography with a fluorescence detector (HPLC-FLD) of L and L with Mg(2+) ions in solvents were studied. In alcohol solvent, [L+alcohol molecule] was formed and the mechanism aspect of L concerning the remarkable fluorescence response for Mg(2+) has been discussed.
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China. Electronic address: zhaodi_liu@163.com.
Zhaodi
Z
Liu
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China.
Huajie
H
Xu
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China.
Shuisheng
S
Chen
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China. Electronic address: shenglq@fync.edu.cn.
Liangquan
L
Sheng
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China.
Hong
H
Zhang
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China.
Fuying
F
Hao
Xi'an Modern Chemistry Research Institute, Xi'an, Shanxi, China.
Pengfei
P
Su
Department of Chemistry and Materials Engineering, Fuyang Normal College, Fuyang, China.
Wenlong
W
Wang
D002851:Chromatography, High Pressure Liquid; D018360:Crystallography, X-Ray; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D007536:Isomerism; D008274:Magnesium / Q000737:chemistry*; D055620:Optical Phenomena; D011522:Protons; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet; D053719:Tandem Mass Spectrometry
D005456:Fluorescent Dyes; D011522:Protons; D012997:Solvents; D008274:Magnesium
Fluorescent chemosensor; Mechanism; Solvent-dependent; Turn-on