- Cation exchange reversibly switches rotor speed and is monitored by a networked fluorescent reporter
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Framework 1, a freely rotating turnstile, is transformed by sequential metal ion addition into the coordination-based double-minimum rotors [M2(1)]2n+ that operate at 8 kHz (M = Zn2+; n = 2) and 30 kHz (M = Cu+; n = 1). In a network with the fluorescent receptor 2, the metal ion exchange at [M2(1)]2n+ and thus indirectly the rotor speed is reported by distinct fluorescence changes at 2.
- ?zer, Merve S.,Paul, Indrajit,Goswami, Abir,Schmittel, Michael
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- A selective chromogenic reagent for nitrate
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Nitrate sensing: A selective colorimetric sensing of nitrate by a mercury complex of an oxa-thia-aza macrocycle functionalized with an azo dye is described. The figure shows the color of acetonitrile solutions of the mercury complex in the presence of the
- Sancenon, Felix,Martinez-Manez, Ramon,Soto, Juan
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- Multi-channel receptors and their relation to guest chemosensing and reconfigurable molecular logic gates
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The synthesis and characterisation of a family of multi-channel receptors containing crown-cation binding sites anchored to a 1-aminophenyl-1,2,2- tricyanoethylene group is reported. The ligands L1-L6bear a 1-aminophenyl-1,2,2-tricyanoethylene scaffolding which is simultaneously a redox-active group (showing reduction processes at moderately modest potentials) and an acceptor moiety in the 1-aminophenyl-1,2,2-tricyanoethylene chromophore. Additionally, dyes L1-L6 also show fluorescence emission. The colour variation of L1-L6 in acetonitrile in the presence of the metal cations Ag+, Cd2+, Cu2+, Fe2+, Hg2+, Pb2+ and Zn2+ has been studied. Selective hypsochromic shifts were found for the systems L 4-Pb2+, L5-Hg2+ and L 6-Hg2+ For Hg2+ with L5 and L 6 and Pb2+ with L4, emission fluorescence enhancements most likely associated with metal coordination to the anilinium nitrogen were observed. The electrochemical behaviour of receptors L 1-L6 was studied in acetonitrile with platinum as working electrode and [Bu4N][BF4] as supporting electrolyte. This family of receptors shows a one-electron reversible reduction process at around -0.70 V vs. SCE, attributed to the reduction of the tricyanovinyl group. Additionally, all the receptors also show the oxidation of the anilinium moiety at about 1.2-1.4 V vs. SCE. Significant anodic shifts of both reduction and oxidation waves were found in the presence of certain metal cations. The relationship of these multiple-channel signalling receptors with guest chemosensing and reconfigurable molecular-based logic gates is discussed. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.
- Jimenez, Diego,Martinez-Manez, Ramon,Sancenon, Felix,Ros-Lis, Jose V.,Soto, Juan,Benito, Angel,Garcia-Breijo, Eduardo
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- Chemoselective detection of Ag+ in purely aqueous solution using fluorescence ‘turn-on’ probe based on crown-containing 4-methoxy-1,8-naphthalimide
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A novel derivative of 4-methoxy-1,8-naphthalimide bearing N-phenylazadithia-15-crown-5 ether receptor has been demonstrated as the selective and sensitive fluorescent probe for the detection of silver(I) ions in purely aqueous solution at neutral pH.
- Panchenko, Pavel A.,Polyakova, Anna S.,Fedorov, Yurii V.,Fedorova, Olga A.
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p. 155 - 157
(2019/04/25)
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- Solvent effect and amine interference on colorimetric changes of azobenzene-conjugated dithiaazadioxo crown ether mercury sensor
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The colorimetric behavior of an azobenzene-based dye containing dithiaazadioxo ring for Hg2+-detection was investigated in diverse solvents. The mercury specific ligand shows hypsochromic changes in pure and aqueous MeCN upon Hg2+-bi
- Jeon, Chang Hoon,Lee, Jayeon,Ahn, Sang Jung,Ha, Tai Hwan
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p. 6841 - 6847
(2019/04/10)
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- Dyes that bear thiazolylazo groups as chromogenic chemosensors for metal cations
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A family of dyes (L1-L6) that contain a thiazolylazo group as signalling subunit and several macrocyclic cavities with different ring sizes and type and number of heteroatoms as binding sites has been synthesized and characterized. Solutions of L1-L6 in acetonitrile show broad and structureless absorption bands in the 554-577 nm range with typicalmolar absorption coefficients that range from 20000 to 32000 M -1 cm-1. A detailed protonation study was carried out with solutions of L1, L2 and L5 in acetonitrile. Addition of one equivalent of protons to L1 and L2 resulted in the development of a new band at 425 and 370 nm, respectively, which was ascribed to protonation in the aniline nitrogen. In contrast, protonation of L5 resulted in a bathochromic shift of 25 nm of the absorption band that was conceivable with protonation of one of the nitrogen atoms of the azo moiety. These results were in agreement with 1H NMR spectroscopic data. Theoretical studies on the model ligand L1 and on different possible protonation species were also performed by using density functional theory (DFT) quantum mechanical calculations. Colour modulations in solutions of L1-L6 in acetonitrile in the presence of the metal cations Fe3+, Ni2+, Zn2+, Cd2+, Pb2+ and Hg2+ have been studied. A selective chromogenic response of L4 in the presence of Pb2+ and L5 in the presence of Hg2+ was observed. To get a better insight into the chromophoric nature in the presence of metal cations, the interaction of Hg2+ with the model compound L1 in two different coordination modes was studied theoretically by using density functional theory (DFT) quantum mechanical calculations.
- Abalos, Tatiana,Moragues, Maria,Royo, Santiago,Jimenez, Diego,Martinez-Manez, Ramon,Soto, Juan,Sancenon, Felix,Gil, Salvador,Cano, Joan
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body text
p. 76 - 84
(2012/03/12)
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- A near IR di-styryl BODIPY-based ratiometric fluorescent chemosensor for Hg(II)
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A novel BODIPY-based near-IR emitting probe as a selective and sensitive fluorophore for Hg(II) is synthesized. This versatile BODIPY fluorophore is functionalized for long wavelength emission at the 3 and 5 positions via a condensation reaction in which
- Atilgan, Serdar,Kutuk, Ilker,Ozdemir, Tugba
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supporting information; experimental part
p. 892 - 894
(2010/05/03)
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- A highly selective fluorescent chemosensor for silver(I) in water/ethanol mixture
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Synthesis, photophysical, and complexation properties of fluorescent chemosensors, L1 and L2, with 'receptor-spacer-fluorophore' motif (L1: NS2O2-cyclic receptor, L2: acyclic analogue recep
- Park, Chul Soon,Lee, Jai Young,Kang, Eun-Ju,Lee, Ji-Eun,Lee, Shim Sung
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scheme or table
p. 671 - 675
(2011/03/19)
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- Hg2+ and Cu2+ selective detection using a dual channel receptor based on thiopyrylium scaffoldings
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2,4,6-Triphenylthiopyrylium functionalized with an aza-oxa-thia macrocycle is able to selectively recognize Hg2+ cation by a color change and Cu2+ cation by a remarkable significant emission enhancement.
- ábalos, Tatiana,Jiménez, Diego,Martínez-Má?ez, Ramón,Ros-Lis, Jose Vicente,Royo, Santiago,Sancenón, Félix,Soto, Juan,Costero, Ana M.,Gil, Salvador,Parra, Margarita
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supporting information; experimental part
p. 3885 - 3888
(2009/09/30)
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- Coupling selectivity with sensitivity in an integrated chemosensor framework: Design of a Hg2+-responsive probe, operating above 500 nm
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For the highly selective and sensitive sensing of Hg2+ in water, a new design concept was realized where the selectivity of the probe's binding site is amplified by electronic properties of the chromophore. The molecular architecture of this ph
- Descalzo, Ana B.,Martinez-Manez, Ramon,Radeglia, Reiner,Rurack, Knut,Soto, Juan
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p. 3418 - 3419
(2007/10/03)
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