2002
DOI: 10.1039/b207335h
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A selective colorimetric anion sensor based on an amide group containing macrocycle

Abstract: A new colorimetric anion sensor 4 allows for selective 'naked-eye' differentiation of F-, AcO- and H2PO4- with similar basicity.

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Cited by 124 publications
(40 citation statements)
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“…[8±14] As the buffer solutions themselves typically contain additional anionic species such as acetates and phosphates, this complicates the sensing function due to competition for the binding sites between those anions buffering the solution and the analyte to be detected. Although these problems can be solved by carrying out the colorimetric detection in dry organic solvents, [15] in practice this is not very convenient since most of the analytes of interest are found in aqueous solutions.…”
Section: Introductionmentioning
confidence: 99%
“…[8±14] As the buffer solutions themselves typically contain additional anionic species such as acetates and phosphates, this complicates the sensing function due to competition for the binding sites between those anions buffering the solution and the analyte to be detected. Although these problems can be solved by carrying out the colorimetric detection in dry organic solvents, [15] in practice this is not very convenient since most of the analytes of interest are found in aqueous solutions.…”
Section: Introductionmentioning
confidence: 99%
“…The formation of such hydrogen bonds affects the electronic properties of the chromophore, resulting in a color change with a subsequent new charge-transfer interaction between the fluoride-bound amide moiety and the electron deficient 4-nitrophenyl group. 12,13 The interaction of receptor 1 with F -was corroborated by 1 H NMR titration experiments carried out in DMSO-d 6 . Different patterns were observed in the titration ranges of 0-1.0 equiv.…”
Section: Absorption Spectramentioning
confidence: 99%
“…Piatek e Jurczak sintetizaram o quimiossensor macrocíclico aniônico 11, que apresenta dois anéis aromáticos conectados por uma ligação amida. 47 Um dos anéis é rico em elétrons enquanto o outro é elétron-deficiente, de maneira que a ligação amida que os conecta torna o conjunto uma unidade de sinalização. Os dois grupos NH adicionais presentes no quimiossensor auxiliam no reconhecimento aniônico.…”
Section: Quimiossensores Fundamentados Em Reações áCido-base E/ou Em unclassified
“…Foi verificado que o composto 11 em acetonitrila forma uma solução incolor, que não é modificada na presença de Cl -, Br -ou HSO 4 -. 47 No entanto, a adição de F -tinge o meio com coloração turquesa, o acetato deixa a solução amarela e o H 2 PO 4 -modifica a cor da solução para púrpura. 47 Os estudos pioneiros na área da complexação de ânions por macrociclos pirrólicos foram explorados por Sessler.…”
Section: Quimiossensores Fundamentados Em Reações áCido-base E/ou Em unclassified