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Lijun Tang,Jiaojiao Guo,Zhenlong Huang 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.4
A known Hg2+ selective rhodamine B derivatised probe 1 was reinvestigated as a colorimetric and fluorescent probe for Cu2+ through changing the applied solvent media. Probe 1 exhibited good selectivity and sensitivity to Cu2+ in CH3CN-H2O (7:3, v/v, HEPES 10 mM, pH 7.0) solution with a detection limit of 9.74 × 10−7 M. The Cu2+ sensing event was proved to be irreversible through hydrolysis of 1 to release rhodamine B.
A New Rhodamine B Derivative As a Colorimetric Chemosensor for Recognition of Copper(II) Ion
Tang, Lijun,Li, Fangfang,Liu, Minghui,Nandhakumar, Raju Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
A new rhodamine-based sensor 1 was designed and synthesized by incorporating rhodamine B and benzimidazole moieties. Sensor 1 exhibits high selectivity and sensitivity to $Cu^{2+}$ in $CH_3CN$-water solution (HEPES buffer, pH = 7.0) with an obvious color change from colorless to pink. Other metal ions such as $Hg^{2+}$, $Ag^+$, $Pb^{2+}$, $Sr^{2+}$, $Ba^{2+}$, $Cd^{2+}$, $Ni^{2+}$, $Co^{2+}$, $Fe^{2+}$, $Mn^{2+}$, $Cu^{2+}$, $Zn^{2+}$, $Ce^{3+}$, $Mg^{2+}$, $K^+$ and $Na^+$ had no such color change and have no significant influence on $Cu^{2+}$ recognition process. The interaction of $Cu^{2+}$ and sensor 1 was proven to adopt a 1:1 binding stoichiometry and the recognition process is reversible.
Tang, Lijun,Li, Fangfang,Liu, Minghui,Nandhakumar, Raju Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.9
A new rhodamine B-coumarin conjugate (1) capable of recognizing both $Cu^{2+}$ and $Fe^{3+}$ using two different detection modes have been designed and synthesized. The metal ion induced optical changes of 1 were investigated in $CH_3CN-H_2O$ (1:1, v/v, HEPES 50 mM, pH = 7.0) solution. Sensor 1 exhibits selective colorimetric recognition of $Cu^{2+}$ and fluorescent recognition of $Fe^{3+}$ with UV-vis and fluorescence spectroscopy, respectively. Moreover, both of the $Cu^{2+}$ and $Fe^{3+}$ recognition processes are observed to be barely interfered by other coexisting metal ions.
Tang, Lijun,Wen, Xin,Dai, Xin,Wu, Di,Huang, Zhenlong Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.11
A quinoline-thiooxorhodamine conjugate fluorescent sensor (1) has been synthesized. Sensor 1 exhibits high selectivity and sensitivity to $Hg^{2+}$ in $H_2O$/DMSO (95/5, v/v, HEPES 20 mM, pH = 7.4) solution with fluorescence detection. Other tested metal ions do not induce any significant fluorescence intensity changes. Sensor 1 interacts with $Hg^{2+}$ through a 1:1 binding stoichiometry with a good anti-inference ability. In addition, fluorescent imaging of $Hg^{2+}$ in Hela cells is also successfully demonstrated.
A New Rhodamine B Derivative As a Colorimetric Chemosensor for Recognition of Copper(II) Ion
Lijun Tang,Fangfang Li,Minghui Liu,Raju Nandhakumar 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
A new rhodamine-based sensor 1 was designed and synthesized by incorporating rhodamine B and benzimidazole moieties. Sensor 1 exhibits high selectivity and sensitivity to Cu2+ in CH3CN-water solution (HEPES buffer, pH = 7.0)with an obvious color change from colorless to pink. Other metal ions such as Hg2+, Ag+, Pb2+, Sr2+, Ba2+, Cd2+, Ni2+, Co2+,Fe2+, Mn2+, Cu2+, Zn2+, Ce3+, Mg2+, K+ and Na+ had no such color change and have no significant influence on Cu2+ recognition process. The interaction of Cu2+ and sensor 1 was proven to adopt a 1:1 binding stoichiometry and the recognition process is reversible.
Lijun Tang,Guoyou Zhao,Nannan Wang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
The colorimetric and fluorescent cyanide recognition properties of 2-[(9-ethyl-9H-carbazol-3-yl)methylene]- propanedinitrile (1) in CH3CN-H2O (2/1, v/v, HEPES 10 mM, pH = 7.0) solution were evaluated. The optical recognition process of probe 1 exhibited high sensitivity and selectivity to cyanide ion with the detection limit of 2.04 × 10−6 M and barely interfered by other coexisting anions. The sensing mechanism of probe 1 is speculated to undergo a nucleophilic addition of cyanide to dicyanovinyl group present in compound 1. The colorimetric and fluorescent dual-modal response to cyanide makes probe 1 has a potential utility in cyanide detection.
Lijun Tang,Raju Nandhakumar,Minghui Liu,Fangfang Li 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.9
A new rhodamine B-coumarin conjugate (1) capable of recognizing both Cu^2+ and Fe^3+ using two different detection modes have been designed and synthesized. The metal ion induced optical changes of 1 were investigated in CH_3CN-H_2O (1:1, v/v, HEPES 50 mM, pH = 7.0) solution. Sensor 1 exhibits selective colorimetric recognition of Cu^2+ and fluorescent recognition of Fe^3+ with UV-vis and fluorescence spectroscopy,respectively. Moreover, both of the Cu^2+ and Fe^3+ recognition processes are observed to be barely interfered by other coexisting metal ions.
Tang, Lijun,Zhou, Pei,Qi, Zhikai,Huang, Zhenlong,Zhao, Jia,Cai, Mingjun Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
A new quinoline-based acylhydrazone (1) has been synthesized and applied as a fluorescent probe. Probe 1 exhibits high selectivity and sensitivity to $Cu^{2+}$ with fluorescence "ON-OFF" behavior in HEPES buffered (1‰ DMSO, HEPES 20 mM, pH = 7.4) solution. The on-site generated 1-$Cu^{2+}$ complex displays excellent selectivity to sulfide ions with fluorescence "OFF-ON" performance through copper displacement approach.
Colorimetric and Fluorescent Recognition of Fluoride by a Binaphthol Thioureido Derivative
Tang, Lijun,Wang, Nannan,Guo, Jiaojiao Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
A new thiourea based receptor (1) was synthesized and applied to fluoride ion recognition in acetonitrile solution. Receptor 1 displayed dual changes in absorption and fluorescence emission intensities selectively for fluoride ions. The interaction of 1 with fluoride undergoes a deprotonation process that is confirmed by $^1H$ NMR titration.