with anions. Of all the anions tested, only cyanide was able to induce the bleaching of the yellow 1·Fe(III) complex solution. This bleaching was ascribed to the formation of 1·Fe(III)-CN complex that restored, to some extent, the optical features of the free probe allowing the chromogenic sensing of cyanide. Besides, 1·Fe(III) complex was used to detect cyanide in acetonitrile-water 90:10 v/v mixtures
5-diphenylpent-2-ene-1,5-dione (PDO) is a colorimetricsensor of Lewis acid cations that has been covalently attached to a poly(ethyleneglycol) (PEG) scaffold. The resulting PDO-PEG is soluble in water and other organic solvents and acts as a colorimetricsensor of Lewis acid cations by undergoing cyclization into the triarylpyrylium form. In water, PDO-PEG also undergoes the colorimetric change in the presence of
Surfactant-assisted chromogenic sensing of cyanide in water
作者:Tatiana Ábalos、Santiago Royo、Ramón Martínez-Máñez、Felix Sancenón、Juan Soto、Ana M. Costero、Salvador Gil、Margarita Parra
DOI:10.1039/b909705h
日期:——
Chromogenic cyanide recognition in water was achieved by the use of a hydrophobic dye in micellar containers.
在胶束容器中使用疏水性染料实现了水中氰化物的彩色识别。
Multi-channel receptors based on thiopyrylium functionalised with macrocyclic receptors for the recognition of transition metal cations and anions
作者:T. Ábalos、D. Jiménez、M. Moragues、S. Royo、R. Martínez-Máñez、F. Sancenón、J. Soto、A. M. Costero、M. Parra、S. Gil
DOI:10.1039/b921486k
日期:——
We report herein the synthesis and characterization of a family of ligands containing different cation binding sites covalently connected to a thiopyrylium signalling reporter. The receptors L1–L6 are able to signal the presence of certain metalcations via three different channels; i.e. electrochemically, fluorogenically and chromogenically. An acetonitrile solution of L1–L6 shows a bright blue colour
Unexpected pyrylium to pyrylium domino transformation. Synthesis of pyrano[3,4-c]pyran-7-ium cation and its recyclization to 2,7-naphthyridine derivative
作者:Konstantin F. Suzdalev、Alina V. Krachkovskaya、Mikhail E. Kletskii、Oleg N. Burov、Artem V. Tatarov、Sergey V. Kurbatov
DOI:10.1007/s10593-017-2033-9
日期:2017.2
6-diphenylpyrylium perchlorate in three steps. Its reaction with triethyl orthoformate was accompanied by rearrangement of the initial pyrylium ring and led to pyrano[3,4-c]pyran-7-ium perchlorate system through a domino process involving ethanol addition-elimination. A plausible mechanism of the reaction is suggested on the basis of DFT quantum-chemical calculations. Reaction of the obtained pyrano[3,4-c]pyran-7-ium
从高氯酸2,6-二苯基吡啶鎓中分三步得到4-乙基-3-甲酰基-2,6-二苯基吡啶鎓高氯酸盐。它与原甲酸三乙酯的反应伴随有最初的吡啶鎓环的重排,并通过涉及乙醇加成消除的多米诺法制得了吡喃并[3,4- c ]吡喃-7-高氯酸钾体系。在DFT量子化学计算的基础上,提出了一个合理的反应机理。所获得的吡喃并[3,4- c ]吡喃-7-高氯酸盐与乙酸铵的反应产生了2,7-萘啶衍生物,而没有骨架重排。