Chromogenic and fluorogenic chemosensors and reagents for anions. A comprehensive review of the years 2010-2011.

Question

1. What surfactants inhibited the reaction between thiols and squa?

2. What is the effect of the MV2+ on the emission of QDs?

3. How did the addition of acO- to a DMF solution affect colour?

4. What induced the quenching of both monomer and excimer emissions?

Accepted Answer

Other anionic surfactants, such as dodecylbenzene sulphonate, tetradecyl sulphate and dodecyl phosphate, were also able to inhibit the squaraine-thiol reaction with the subsequent chromogenic response.

Accepted Answer

Specifically MV2+, in the proximity of QDs, rendered the fluorescence of QDs in the ”off” state due to an efficient electron transfer process.

Accepted Answer

The addition of 0.2 molar equiv. of F- to a DMF solution of 58 or 59 induced drastic colour changes from colourless to intense blue or violet, respectively.

Accepted Answer

F- induced the quenching of both monomer and excimer emissions, whereas H2PO4 - was able to not only quench the monomer, but to also enhance excimer fluorescence.

Accepted Answer

Upon the addition of small quantities of anion F- (0.1 equiv.) to this gel, changes in colour from deep yellow to bright red were observed.

Accepted Answer

The strong basicity of these anions enhanced the electron density of NH and NH2, which subsequently propagated to the metal bound to 1,10-phenantroline, causing increased intramolecular quenching of emission intensity.

Accepted Answer

Addition of anions F- and AcO- to the solutions of both receptors induced moderate red shifts of the visible bands from 475 to 535 nm and from 488 to 503 nm for 311 and 312, respectively (changes in colour from yellow-orange to magenta).

Accepted Answer

The formation of the red-shifted band was ascribed to a deprotonation of one of the sulphonamide moieties promoted by basic F-. Addition of AcO- and H2PO4 - induced very slight changes in the UV-visible profiles, indicating that both anions were unable to deprotonate 424 and 425.

Accepted Answer

A series of receptors (i.e., 12a-15b, see Fig. 6) containing phenylboronic acid groups and urea or thiourea units were used for the simultaneous recognition of the carboxylate groups.

Accepted Answer

Addition of other anions (i.e., Cl-, Br-, I-, NO3 -, ClO4 -, H2PO4 - and AcO-) induced negligible changes in the emission profile of chemodosimeter 405.

Accepted Answer

The selective recognition ability displayed to P2O7 4- can be ascribed to the appropriate size of the P2O7 4- anion and to the complementary structure between the receptors and P2O7 4- with each phosphoryl oxygen atom binding to one metal centre.

Accepted Answer

Quinoline-based Zn2+ complex 247 (see Fig. 118) was prepared and used as a fluorescent chemosensor for P2O7 4- under physiological conditions.

Accepted Answer

the fluorescence intensity ratios at 510 and 590 nm changed from 0.09 to 275 with the addition of Cys, showing a limit of detection of 8.2 x 10-8 mol L-1.

Accepted Answer

In 2010-2011, a total of 153 examples were related with the binding sitesignalling subunit approach, which is still the most widely used approach to develop chromofluorogenic anion probes.

Accepted Answer

The emission behaviour of these receptors was tested in the presence of selected amino acids (i.e., Trp, Tyr, Phe, His, Pro, Gly, Glu, Ala, Val, Cys and Ser).

Accepted Answer

Other amino acids tested (i.e., Ala, Arg, Asn, Asp, Gln, Glu, Gly, His, Ile, Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr and Val) induced negligible changes in the emission profile of the hybrid sensory system.

Accepted Answer

221 Aqueous solutions of complex 349 (CAPS buffer, pH 10.5) presented an intenseemission band at 440 nm (excitation at 317 nm), which was partially quenched upon the addition of increasing quantities of dye 350.

Accepted Answer

299 could also be used for the colourimetric detection of Cys because this was the only amino acid that was able to change the colour of the H2O:CH3OH 99:1 v/v solutions of the complex from colourless to red.

Chromogenic and fluorogenic chemosensors and reagents for anions. A comprehensive review of the years 2010-2011.

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Most frequently asked questions

1. What surfactants inhibited the reaction between thiols and squa?

2. What is the effect of the MV2+ on the emission of QDs?

3. How did the addition of acO- to a DMF solution affect colour?

4. What induced the quenching of both monomer and excimer emissions?

5. What was the effect of adding anion F- to the gel?

6. What is the effect of the basicity of the anions on the emission intensity?

7. What is the effect of the addition of anions to the solution of receptors 311 and?

8. What was the effect of adding AcO and H2PO4 on the UV-visible profiles?

9. What receptors were used for the simultaneous recognition of the carboxylate groups?

10. What was the effect of addition of other anions on the emission of chemodos?

11. What is the selective recognition ability of P2O7 4-?

12. What was used as a fluorescent chemosensor for P2O7 4-?

13. How much did the fluorescence intensity of the probes change with the addition of Cys?

14. How many examples were related to the binding sitesignalling subunit approach?

15. What amino acids were used to test the emission behaviour of these receptors?

16. What amino acids induced negligible changes in the emission profile of the hybrid sensory system?

17. How did the aqueous solution of complex 349 present an intense emission band?

18. What was the only amino acid that could change the colour of the complex from colourless to red?

Figures

Citations

Applications of Supramolecular Anion Recognition

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The Optoelectronic Nose: Colorimetric and Fluorometric Sensor Arrays.

Anion Recognition Strategies Based on Combined Noncovalent Interactions.

Highly photoluminescent carbon dots-based fluorescent chemosensors for sensitive and selective detection of mercury ions and application of imaging in living cells

References

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Chemosensors for pyrophosphate.

A fluorescent probe for fast and quantitative detection of hydrogen sulfide in blood

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