Host Solids Containing Nanoscale Anion‐Binding Pockets and Their Use in Selective Sensing Displacement Assays

Comes, María; Rodríguez-López, Gertrudis; Marcos, Mercedes; Martínez‐Máñez, Ramón; Sancenón, Félix; Soto, Juán; Villaescusa, Luis A.; Amorós, Pedro; Beltrán, Daniel

doi:10.1002/anie.200461511

Cited by 88 publications

(17 citation statements)

References 48 publications

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“…[14][15][16][17][18] However, in recent years, SBA-15 and MCM-41 have attracted significant interest for the development of optical chemical sensors. [19][20][21][22][23][24][25] Although these materials offer considerable advantages over other methods in the area of sensing technologies, there is still a growing demand to solve one of the major technological challenges in nano-optical sensors: the detection and determination of environmentally important toxic species at a low level of concentration with a rapid-assessment process.…”

Section: Introductionmentioning

confidence: 99%

Optical Sensor Based on Nanomaterial for the Selective Detection of Toxic Metal Ions

Lee

Seo

et al. 2007

Adv Funct Materials

125

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A heterogeneous “naked‐eye” colorimetric and spectrophotometric cation sensor, SNT‐1, was prepared by immobilization of the azo‐coupled macrocyclic receptor 1 on a silica nanotube (SNT) via sol–gel reaction. The optical sensing ability of SNT‐1 was studied by addition of metal ions such as Ag+, Co2+, Cd2+, Pb2+, Zn2+, Fe3+, Cu2+, and Hg2+ (all as nitrates) in water. Upon the addition of Hg2+ in suspension SNT‐1 resulted in a color change from yellow to violet. This is novel rare example for chromogenic sensing of a specific metal ion by inorganic nanotubes. On the other hand, no significant changes in color were observed in the parallel experiments with Co2+, Cd2+, Pb2+, Zn2+, Fe3+, Cu2+, and Ag+. These findings confirm that SNT‐1 can be useful as chemosensors for selective detection of Hg2+ over a range of metal ions. More interestingly, after addition of NO3– and ClO4– SNT‐1 was observed to change color from yellow to violet and pink, respectively. However, no color changes were observed upon addition of Cl–, Br–, I–, SCN–, or SO42–. Furthermore, the extraction ability of SNT‐1 was also estimated by measuring the amount of Hg2+ adsorbed by ion chromatography, showing that 95 % of the Hg2+ ion is extracted by SNT‐1. This suggests that SNT‐1 is potentially useful as a stationary phase for the separation of Hg2+ in liquid chromatography. In order to extend the above performance to a portable chemosensor kit, SNT‐1 was coated as a thin film of 50 μm thickness onto a glass substrate. The supported SNT‐1 also changed from yellow to violet when dipped into Hg2+ solution. On the other hand, no significant change in color was observed in other metal‐ion solutions. The results imply that the supported SNT‐1 is applicable as a portable colorimetric sensor for detection of Hg2+ in the field.

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Section: Introductionmentioning

confidence: 99%

Optical Sensor Based on Nanomaterial for the Selective Detection of Toxic Metal Ions

Lee

Seo

et al. 2007

Adv Funct Materials

125

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“…The ability to fine tune the Sb(III) ion-selective system, when combined with actively diverse ions, is of particular interest [35]. It is important to note that the ion selectivity of the chemosensors is based on the use of the PR-probe molecule in both solution [37] and solid phases, as reported in this current manuscript.…”

Section: Selectivitymentioning

confidence: 99%

“…A major advantage of the nanostructure sensors is the achievement of rational functionality in terms of sensitivity and rapid response time with a number of regeneration cycles of the chemosensors [33][34][35]. Although the improvement of the reversibility of the optical chemical sensors is a challenge, the hexagonal monolithic sensors can extend control of the recognition and signaling of Sb(III) analyte ions even af- ter several cycles of decomplexation in which an appropriate stripping agent is used, such as 0.01 M of EDTA (Fig.…”

Section: Reducibility Of the Sensormentioning

confidence: 99%

A selective optical sensor for antimony based on hexagonal mesoporous structures

Ismail¹

2008

Journal of Colloid and Interface Science

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“…These groups have particularly high affinities for oxo-anions, as they are capable of forming two hydrogen bonds to the oxo-anion. 11,[13][14][15]21 Therefore, many artificial anion receptors containing the urea/thiourea subunits have been designed, synthesized and tested for anion recognition and sensing during the past few decades. Many examples are available on the selective phenylurea and phenylthiourea moieties receptor molecules for the fluoride ion.…”

Section: 12mentioning

confidence: 99%

Anion Sensing Properties of New Colorimetric Chemosensors Based on Thiourea and Urea Moieties

Kim¹,

Kim²,

Hwang³

et al. 2012

Bulletin of the Korean Chemical Society

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A new colorimetric sensors containing thiourea (1-(4-nitrophenyl)-3-quinolin-6-ylthiourea; 1) and urea(1-(4-nitrophenyl)-3-quinolin-6-ylurea; 2) moieties for fluoride were designed and synthesized. These simple receptors were characterized their stoichiometry, and investigates the mechanism of their selectivity as anion receptors. The addition of tetrabutylammonium fluoride salts to the solution of receptors caused a dramatically and clearly observable color changes from colorless to yellow. To examine their application as anion receptors by UV-vis and 1 H NMR spectroscopy results revealed their higher selectivity for fluoride ion than other anions. The receptors and fluoride ion formed a 1:1 stoichiometry complex through strong hydrogen bonding interactions in the first step, followed by a process of deprotonation in presence of an excess of F − in DMSO solvent.

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Host Solids Containing Nanoscale Anion‐Binding Pockets and Their Use in Selective Sensing Displacement Assays

Cited by 88 publications

References 48 publications

Optical Sensor Based on Nanomaterial for the Selective Detection of Toxic Metal Ions

Optical Sensor Based on Nanomaterial for the Selective Detection of Toxic Metal Ions

A selective optical sensor for antimony based on hexagonal mesoporous structures

Anion Sensing Properties of New Colorimetric Chemosensors Based on Thiourea and Urea Moieties

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