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• 643-78-7 1,2-bis(1H-pyrrol-2-yl)ethanedione 

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• 1381848-94-7 C₃₀H₁₄F₁₀N₈ 

Relevant academic research and scientific papers

Dipyrrolylquinoxaline-bridged Schiff bases: A new class of fluorescent sensors for mercury(II)

Novel 2,3-bis(1H-pyrrol-2-yl)quinoxaline-functionalized Schiff bases were prepared and characterized as new fluorescent sensors for mercury(II) ion. The X-ray crystal structures of compounds 4, 5, 4a and 5a were determined. The binding properties of 4 and 5 for cations were examined by UV-vis and fluorescence spectroscopy. The UV-vis and fluorescence data indicate that a 1: 1 stoichiometric complex is formed between compound 4 (or 5) and mercury(II) ion, and the association constant is (3.81 ± 0.7) × 105 M-1 for 4 and (3.43 ± 0.53) × 105 M -1 for 5. The recognition mechanism between compound 4 (or 5) and metal ion was discussed based on their chemical construction and the fluorescence quenching effect when they interact with each other. Competition experiments revealed that compound 4 (or 5) has a highly selective response to mercury(II) ion in aqueous solution. The Royal Society of Chemistry 2005.

Synthesis structural and spectroscopic properties of quinoxaline-bridged bisBODIPYs

Two novel quinoxaline-bridged bisBODIPYs have been synthesized by the condensation of 2,3-bis(5-formylpyrrol-2-yl)quinoxaline with 3-ethyl-2,4-dimethylpyrrole followed by a modification using a Knoevenagel reaction. They were well characterized by X-ray diffraction, NMR, HRMS UV-vis and fluorescence spectroscopy. These two quinoxaline-bridged bisBODIPYs have unusual broad absorption bands, which are different from those of typical BODIPYs They exhibit broad red-shifted emission bands centered at around 610 nm and 730 nm respectively with larger Stokes shifts at the range of 1421-2136 cm-1 Both bisBODIPYs show different extent solvent-dependent fluorescence and exhibit fluorescence quenching in polar solvents due to the existence of possible intramolecular charge transfer.

Dipyrrolylquinoxaline-bridged hydrazones: A new class of chemosensors for copper(II)

Novel 2,3-bis(1H-pyrrol-2-yl)quinoxaline-fun-ctionalized hydrazones were prepared and characterized as new chemosensors for copper(II) ion. The binding properties of the compounds 4,5, 6 and 7 for cations were examined by UV-vis, fluorescence spectroscopy, and linear sweep vol-tammetric experiments (LSV). The results indicate that a 1:1 stoichiometric complex is formed between compound 4 (or 5, 6, 7) and copper(II) ion, and the association constant is 1.3 × 105 M-1 for 4, 2.1 × 106M-1 for 5, 4.1 × 105M-1 for 6 and 8.0 × 10 M -1 for 7, respectively. The recognition mechanism between compound 4 (or 5, 6, 7) and metal ion was discussed based on their electrochemical properties, absorbance changes, and the fluorescence quenching effect when they interact with each other. Control experiments revealed that compound 4 (or 5, 6, 7) has a highly selective response to copper (II) ion.

A novel class of Cd(ii), Hg(ii) turn-on and Cu(ii), Zn(ii) turn-off Schiff base fluorescent probes

N,N′-((5,5′-(Quinoxaline-2,3-diyl)bis(1H-pyrrole-5,2-diyl)) bis(methanylylidene))bis(4-methoxyaniline) 4 and N,N′-((5,5′- (quinoxaline-2,3-diyl)-bis(1H-pyrrole-5,2-diyl))bis(methanylylidene))dianiline 5 have been prepared and structurally characterized. The X-ray crystal structures of compounds 4 and 4a have been determined. These compounds displayed good sensitivity toward transition metal ions with Cd(ii), Zn(ii) turn-on and Cu(ii), Hg(ii) turn-off in fluorescence. It is an elegant example of on/off behavior like a lamp. When Cd(ii) or Zn(ii) is added into compounds 4 or 5, the lamp will switch on, and then when Cu(ii) or Hg(ii) is added into the mixture, the lamp will switch off. The binding properties of 4 and 5 for cations were examined by fluorescence spectroscopy. The fluorescence data and crystal structure indicate that a 1:1 stoichiometry complex is formed between compound 4 (or 5) and metal ions, and the binding affinity is very high. The recognition mechanism between compound 4 (or 5) and metal ion was discussed based on the their chemical constructions and the CHEF/CHEQ effect when they interacted with each other.