Anion Recognition and Sensing: The State of the Art and Future Perspectives

Beer, Paul D.; Gale, Philip A.

doi:10.1002/1521-3773(20010202)40:3<486::aid-anie486>3.3.co;2-g

Cited by 787 publications

(1,201 citation statements)

References 0 publications

Supporting

Mentioning

1,182

Contrasting

Unclassified

Order By: Relevance

“…On the other hand, the same description and reason of the best concentration and optimal conditions is reasonable and reliable for the solution of gold and amino acids. Investigation of theoretical and computational chemistry researches shows that interaction between GNPs and amino acids in anionic type is stronger than that of the free and cationic type [37][38][39]. The calculation of density functional theory is given in Table 2; this table shows that the interaction between glycine and cysteine in anionic type with gold clusters is stronger than that of the free and cationic type [40].…”

Section: Resultsmentioning

confidence: 98%

Fabrication of capped gold nanoparticles by using various amino acids

Zare

Khoshnevisan

Barkhi

et al. 2013

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

The production of gold nanoparticles (GNPs) by amino acid is one of the most attractive and interesting subjects in nanobiotechnology. In this study, amino acids have been utilised as a reducing agent and also an agent for capping GNPs. The GNPs were prepared using a reduction solution containing gold cations with optimum concentration of gold salt (5 mM), and also functionalised by glutamic acid, phenylalanine and tryptophan with optimum concentration of amino acids (25 mM). The optimum condition of gold solution and amino acids were achieved by ultraviolet-visible spectroscopy. The size of nanoparticles was obtained 5-20, 10-20 and 20-30 nm, respectively, by transmission electron microscopy and dynamic light scattering techniques. The results obtained from experimental and quantum calculations confirm that amino acids have strong bond while they have anion binding. Moreover, the free carboxylic groups of capped GNPs are one of the suitable and capable beads for binding biological agents. As a result, the medical applications of amino acids and proteins can be used as a practical method due to the strong interaction of peripheral amine groups with nanoparticles.

show abstract

Section: Resultsmentioning

confidence: 98%

Fabrication of capped gold nanoparticles by using various amino acids

Zare

Khoshnevisan

Barkhi

et al. 2013

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

show abstract

“…6 Among the various chemosensors, fluorescent chemosensors have many advantages, including high sensitivity, low cost, ease of detection, and suitability as diagnostic tools for biological concerns. [8][9][10][11][12][13] Different anions can be easily discerned with the naked eye by virtue of the distinct fluorescence wavelengths that they elicit. 14 Unfortunately, this spectroscopic technique provides only indirect information about spectrophotometrical properties and geometries involved in the sensing process.…”

Section: Introductionmentioning

confidence: 99%

A TD‐DFT study on the cyanide‐chemosensing mechanism of 8‐formyl‐7‐hydroxycoumarin

et al. 2010

View full text Add to dashboard Cite

Proton transfer (PT) and excited-state PT process are proposed to account for the fluorescent sensing mechanism of a cyanide chemosensor, 8-formyl-7-hydroxycoumarin. The time-dependent density functional theory method has been applied to investigate the ground and the first singlet excited electronic states of this chemosensor as well as its nucleophilic addition product with cyanide, with a view to monitoring their geometries and spectrophotometrical properties. The present theoretical study indicates that phenol proton of the chemosensor transfers to the formyl group along the intramolecular hydrogen bond in the first singlet excited state. Correspondingly, the nucleophilic addition product undergoes a PT process in the ground state, and shows a similar structure in the first singlet excited state. This could explain the observed strong fluorescence upon the addition of the cyanide anion in the relevant fluorescent sensing mechanism.

show abstract

“…[1][2][3][4][5] Potential applications in the separation and extraction of anionic species, in the development of new sensing systems and in the design of new compounds that may have potential biological activity has driven the synthesis of a plethora of receptors 25 containing amides and thioamides, pyrroles and indoles, ureas and thioureas, ammonium, guanidinium and imidazolium moieties. 6,7 Indole is employed by Nature in sulfate binding protein 8 and in the enzymatic active site of haloalkane dehalogenase 9 30 to bind anions, however research in area of indole-based anion receptors [10][11][12][13][14][15][16][17][18][19][20] is still at an early stage compared to the range of anion receptors based on pyrrole.…”

Section: Introductionmentioning

confidence: 99%

Anion-induced conformational changes in 2,7-disubstituted indole-based receptors

et al. 2009

Self Cite

View full text Add to dashboard Cite

The conformational preorganization and anion-induced conformational changes of indole-based receptors functionalized with amido group at C2 and a variety of amido, urea and thiourea moieties at C7 have been studied by the means of NMR spectroscopy. NOE experiments showed that antianti orientation across C2-C2α and C7-N7α bonds is preferred for receptors 1-4 in acetone 10 solution in the absence of anions. Anion-receptor interactions have been evaluated through 1 H and 15 N chemical shift changes. In bis-amido 2,7-functionalised indoles the interaction with chloride and bromide anions primarily occurs at H1 proton. The formal introduction of urea and thiourea moieties increases the number of hydrogen bond donor sites which manifests itself in distribution of halide-receptor interactions among H1, H7α and H7γ protons. Acetate anions also interact 15 strongly with indole and urea NH donor groups, whereas nitrate anions interact solely with H7α and H7γ urea/thiourea protons. NOE enhancements in the presence of anions revealed that anionreceptor complexes favor syn-syn conformation of C2 and C7 substituents.

show abstract

Anion Recognition and Sensing: The State of the Art and Future Perspectives

Cited by 787 publications

References 0 publications

Fabrication of capped gold nanoparticles by using various amino acids

Fabrication of capped gold nanoparticles by using various amino acids

A TD‐DFT study on the cyanide‐chemosensing mechanism of 8‐formyl‐7‐hydroxycoumarin

Anion-induced conformational changes in 2,7-disubstituted indole-based receptors

Contact Info

Product

Resources

About