Fluorescent Sensor For Fe3 Research Articles

Three layer-structured cadmium coordination polymers based on flexible 5-(4-pyridyl)-methoxylisophthalic acid: rapid synthesis and luminescence sensing

Three layered Cd-CPs, synthesized by a MW-assisted solvothermal method within two or three minutes, serve as fluorescent sensors for Fe3+ ions.

Synthesis, crystal structures and fluorescence properties of coordination polymers based on tetrahedral ligands and secondary bidentate linkers

Two coordination polymers, namely {[Co2L(dpe)2]·0.42H2O} (1), and {[Zn4L2(dpe)4]·4H2O} (2), were solvothermally prepared from a flexible tetrapodal ligand tetrakis[(3-carboxyphenyl)oxamethyl]methane acid (H4L) and a secondary bidentate linker (E)-1,2-di(pyridin-4-yl)ethane (dpe). Single-crystal X-ray diffraction analysis revealed that these compounds possess similar three-dimensional structures, in which the frameworks are constructed from dinuclear SBUs (secondary building units) [M2(COOR)4N4] (M = Co or Zn) and tetrahedral L4− linkers. The overall structures of both compounds can be described as (4, 6)-connected binodal networks, with a Schlafli symbol of {42537}{4255647282} according to the topological analysis. Compound 2 exhibits strong photoluminescence at room temperature, with a peak at 422 nm (excitation at 370 nm), most probably from an intraligand and/or ligand-to-ligand charge transfer (LLCT). The emission of compound 2 was quenched efficiently by Fe3+ ion, suggesting that 2 could be used as a fluorescence sensor for Fe3+.

The experimental and theoretical studies of a merocyanine form based turn off fluorescent sensor for Fe3+ ions with nanomolar level sensitivity in aqueous solution

A substituted spirooxazine was synthesized and characterized by 1H, 13C NMR, and HR-MS spectroscopic techniques. The open form of the spirooxazine derivative was evaluated for the detection of Fe3+ ions. The colorimetric evaluation revealed that the receptor 1 is highly selective and sensitive towards Fe3+ detection and displayed a turn-off fluorescence response with ferric ions through aggregation induced phenomena. No competitive behavior was observed for detection of Fe3+ ions by the receptor in the presence of different metal ions. The paper based strips for 1 displayed an excellent selectivity and sensitivity (38 nm, 2.12 ppb) for Fe3+ ions. We believe that the receptor 1 could be used as a Fe3+ sensor on field detection tool kit. The B3LYP and B3LYP-D3BJ based methods were used to further investigate the stability of the different stereoisomers of merocyanine in order to find a possible mode of binding, while TD-DFT methods were used to study the UV-Visible and fluorescence spectra observed for the receptor.

A Colorimetric and Fluorescent Sensor for Iron Recognition Based on Rhodamine Derivative.

A novel rhodamine based fluorescent sensor, L, was developed and investigated as a colorimetric and fluorescent sensor for Fe3+ in dimethyl sulfoxide. The compound L showed a good selectivity and sensitivity toward Fe3+ in the presence of large excess of other competitive ions. L can be used as a colorimetric and fluorescent sensor for Iron recognition in potential.

A multifunctional Schiff base as a fluorescence sensor for Fe3 + and Zn2 + ions, and a colorimetric sensor for Cu2 + and applications

Chemosensors play important parts in the selective recognition of ions, which is widely applied in various fields of environment, industry and biological sciences. In this work, a chemosensor for multi-metal ions based on rhodamine B derivative was synthesized, which could selectively recognize various metal ions in different solvent system. The addition of Cu2+ caused the color change from colorless to pink in EtOH/H2O (v/v=1:1) solvent system, which could be quickly identified by the naked eyes with a detection limit of 8.27×10−8M. In ethanol solution system, the addition of Fe3+ and Zn2+ caused different fluorescence changes with the detection limit of 2.12×10−7M and 6.64×10−7M respectively. The binding ratios are 1:1 (1-Cu2+), 2:1 (1-Fe3+) and 1:1 (1-Zn2+), respectively. Meanwhile, the probe 1 was used to detect the trace metal ions in real water samples. Besides, the probe 1 showed sensitive fluorescence signals for Fe3+ in biological cells. The experimental results further verify the application value of the sensor.

A novel turn-on colorimetric and fluorescent sensor for Fe3+ and its application in living cells

Abstract A novel turn-on colorimetric and fluorescent sensor 1 based on rhodamine B was developed as a colorimetric and fluorescent chemosensor for Fe3+. Upon addition of Fe3+ in aqueous ethanol, the 1 displayed a distinct color change from colorless to pink and a significant fluorescence enhancement, which can be directly detected by the naked eye. The stoichiometry of 1 to Fe3+ complex was found to be 1:1 and the detection limit was determined as low as 7.68 × 10−7 M. The results suggest that the sensor 1 may provide a conveniently method for visual detection of Fe3+ with high sensitivity. Furthermore the sensor has been utilized for fluorescence imaging of Fe3+ in living cells.

Dual colorimetric and fluorescent chemosensor of Fe3+ and Cu2+ based on 2,5-bis[(4-carboxylic-piperidylamino)thiophenyl]-croconine

A croconium dye, 2,5-bis[(4-carboxylic-piperidylamino)thiophenyl]-croconine (BCTC) based dual signaling probe was found to exhibit colorimetric and fluorescent properties on selective binding towards Fe3+ and Cu2+ in ethanol/water (4:1, v/v) solution, respectively. The binding constants were determined to be 2.12×104 M−1 and 8.58×104 M−1 for Fe3+ and Cu2+, respectively. Most importantly, the 1:1 stoichiometry of the host-guest complexation was confirmed by Job's method. This result was further confirmed by 1H NMR analysis. Meanwhile, the selectivity experiments revealed that the colorimetric and fluorescent sensor were specific for Fe3+ and Cu2+ even with interference by high concentrations of other metal ions. Moreover, the sensing abilities of the receptor toward Fe3+ and Cu2+ were also investigated by electrochemical technique. The present results indicated that the BCTC chemosensor could be adopted as a selective, sensitive and reversible colorimetric and fluorescent sensor for Fe3+ and Cu2+.

A novel turn-on colorimetric and fluorescent sensor for Fe3+ and Al3+ with solvent-dependent binding properties and its sequential response to carbonate

A novel bis-rhodamine derivative BRU was designed and synthesized in a simple way. In aqueous media, BRU could efficiently recognize Fe3+ and Al3+ among other metal ions with different color appearances through a turn-on colorimetric response. In the presence of Fe3+ or Al3+, BRU solution also displayed enhanced fluorescent emission. According to the detection limit, BRU had high recognition sensitivity towards Fe3+ and Al3+ based on either colorimetric absorbance or fluorescent emission. Interestingly, BRU bound to Fe3+ or Al3+ with a simple 1:1 mode in CH3OH and a 1:2 mode in CH3OH/H2O, displaying solvent-dependent binding property. In addition, the in situ generated BRU-Fe3+ and BRU-Al3+ complex exhibited fluorescence turn-off and color disappearance towards carbonate among other anions. These provide a potential application in sequential detection of Fe3+, Al3+ and carbonate with naked-eyes.

Hyperbranched polyester nanorods with pyrrolo[2,1-a]isoquinoline end groups for fluorescent recognition of Fe3+

Novel hyperbranched polyester nanorods HBPE-CICA6 and HBPE-CICA2 were obtained and used to establish a highly sensitive fluorescent sensor for Fe3+ ions.

A novel fluorescent Fe3+ sensor based on a europium complex

A novel Eu3+ complex (EuL) based on 1,10-phenanthroline-2-carboxylic was successfully synthesized, and gave a characteristic red emission. The complex was shown to act as a selective luminescence quencher for Fe3+, as shown by the “on/off” switch phenomenon. The quenching curve showed a double-exponential well decay with the increase of Fe3+ ions. The stability constant of EuL/Fe3+ was calculated as 8.6×103Lmol−1(lgβ/Lmol−1=3.93). The response showed high selectivity for Fe3+ compared with other metal ions; the complex therefore has the potential to be applied as a fluorescent sensor for Fe3+.

A highly selective, fluorescent chemosensor for bioimaging of Fe3+

A fluorescent sensor for Fe(3+) has been synthesized based on rhodamine-lactam, which shows excitation (531 nm) and emission (557 nm) wavelength, displays an excellent selectivity for Fe(3+) and can be used for imaging Fe(3+) in living cells. The pK(a) of the sensor is as low as of 3.2. It can be used in the range of pH 5-9.

X-ray crystallographic and photophysical properties of rhodamine-based chemosensor for Fe3+

A fluorescent sensor for Fe3+, 2-[3′,6′-bis(ethylamino)-2′,7′-dimethyl-3-oxospiro[1H-isoindole-1,9′-[9H]xanthen]-2-((2-aminoethyl) methyl)]phenol, has been synthesized and characterized by 1H NMR, 13C NMR and X-ray crystallography. The photophysical processes of the Fe3+-sensor have been carefully investigated by fluorescence and absorbance spectra. Upon addition of Fe3+, the sensor shows strong fluorescence change with absorbance and emission peaks at 530 and 554nm, respectively. Other metal ions have no such response.