59323-54-5Relevant academic research and scientific papers
A surfactant-modulated fluorescent sensor with pattern recognition capability: Sensing and discriminating multiple heavy metal ions in aqueous solution
Cao, Yuan,Ding, Liping,Hu, Wenting,Peng, Junxia,Fang, Yu
, p. 18488 - 18496 (2014)
Pattern recognition has been widely used to detect and identify multiple analytes. The strategies for realizing pattern recognition of a single sensor are in significant demand. In the present work, a particular bispyrene-based fluorophore containing a hydrophilic spacer, Py-TOA-Py, was synthesized, and it was observed that its mixture with anionic surfactant assemblies realizes multiple fluorescence responses to different metal ions. The combination of fluorescence variation at four emission wavelengths enables the fluorophore/surfactant sensor system to provide specific recognition patterns to different metal ions. Principle component analysis shows that the present single sensor system could discriminate 6 metal ions, namely Fe3+, Co2+, Ni2+, Cu2+, Pb2+, and Hg2+, 5 of which are heavy metal ions. Results from UV-vis measurements rule out the possibility of the bispyrene fluorophore binding with metal ions. Fluorescence titration of metal ions with two other bispyrene fluorophores reveals that the ones with similar hydrophilic spacer, Py-EOA-Py, exhibit similar multiple fluorescence responses, whereas, the ones with hydrophobic spacer, Py-DDA-Py, display no cross-reactive responses. Time-resolved emission spectra measurements reveal that the spacer polarity plays an important role in determining the location of bispyrene in surfactant assemblies, which further influences its cross-reactive responses to metal ions. The present work provides a new strategy for developing fluorescent sensors with pattern recognition abilities.
Ultrasensitive and selective sensing of heavy metal ions with modified graphene
Yu, Chunmeng,Guo, Yunlong,Liu, Hongtao,Yan, Ni,Xu, Zhiyan,Yu, Gui,Fang, Yu,Liu, Yunqi
, p. 6492 - 6494 (2013)
Swift fabrication of a non-covalently modified reduced graphene oxide electronic sensor has been developed. An unparalleled detection limit is demonstrated for Hg2+, down to the picomolar range.
A novel surfactant-like fluorophore and its probing ability to the aggregation of amphiphilic compounds
Zhang, Lei,Gao, Lining,Liu, Qiaojun,Yang, Feipeng,Fang, Yu
, p. 58 - 65 (2012)
A novel surfactant-like non-ionic fluorophore, 3-(bis(2-hydroxyethyl)amino) -N-(4-(pyrene-1-sulfonamido)butyl) propanamide (PSDA-DEA), was designed and prepared. Fluorescence and surface tension studies revealed that the fluorophore aggregates in aqueous medium, and its critical aggregation concentration (CAC) is ~3.3 × 10-5 M. Cryogenic transmission electron microscopy (cryo-TEM), dynamic light scattering (DLS) and atomic force microscopy (AFM) measurements demonstrated that the diameter of the aggregates as formed is of a few hundred nano-meters. It was also shown that the profile of the emission spectrum of the compound is well dependent upon the polarity of its medium, as indicated by a change up to 53% of its intensity ratio at 399 nm and 380 nm (I399/I380) when the solvent changed from water to ethanol. It is of the polarity sensitive property that the fluorophore can be used for monitoring micelle formation of several anionic, cationic and non-ionic surfactants. Furthermore, PSDA-DEA is also a valuable probe for sensing transition of different aggregates such as micelles to vesicles. Comparative studies demonstrated that the present probe is more versatile than pyrene when it is used as a fluorescence probe.
How do liquid mixtures solubilize insoluble gelators? Self-assembly properties of pyrenyl-linker-glucono gelators in tetrahydrofuran-water mixtures
Yan, Ni,Xu, Zhiyan,Diehn, Kevin K.,Raghavan, Srinivasa R.,Fang, Yu,Weiss, Richard G.
supporting information, p. 8989 - 8999 (2013/07/26)
The self-assembly behavior of a series of glucono-appended 1-pyrenesulfonyl derivatives containing α,ω-diaminoalkane spacers (Pn, where n, the number of methylene units separating the amino groups, is 2, 3, 4, 6, 7, and 8) in v:v tetrahydrofuran (THF):water mixtures is examined at room temperature. The Pn at 2 w/v % concentrations do not dissolve in either THF or water at room temperature. However, the Pn can be dissolved in some THF:water mixtures, and they form gels spontaneously in other compositions without dissolving completely. The self-assembly of the Pn in the liquid mixtures has been investigated using a variety of techniques. The particle sizes of the Pn in their solutions/sols, critical gelation concentrations, microstructures, thermal and mechanical stabilities of the gels, and molecular packing modes of Pn molecules in their gel networks are found to be very dependent on the composition of the liquid mixtures. Correlations between the self-assembly behavior of the Pn and the polarity of the liquid mixtures, as probed by E T(30) and Hansen solubility parameters, yield both qualitative and quantitative insights into why self-assembly of the Pn can or cannot be achieved in different liquid compositions. As revealed by UV-vis and fluorescence spectroscopy studies, π-π stacking of the pyrenyl groups occurs as part of the aggregation process. Correlations between the rheological properties of the gels and the Hansen solubility parameters of the Pn and the solvent mixtures indicate that hydrogen-bonding interactions are a major contributor to the mechanical stability. Overall, the results of this study offer a new strategy to investigate the balance between dissolution and aggregation of molecular gelators. To the best of our knowledge, this is the first example of the spontaneous formation of molecular gels without heating by placing gelators in mixtures of liquids in which they are insoluble in the neat components.
Quenching of Fluorescence and Excimer Formation of Sodiumpyren-3-sulfonate in Aqueous Solutions of Polydimethyldiallylammonium Chloride
Becker, H. G. O.,Schuetz, R.,Kuzmin, M. G.,Sadovsky, N. A.,Soboleva, I. V.
, p. 87 - 94 (2007/10/02)
The fluorescence spectra and lifetimes of sodium-pyren-3-sulfonate have been measured in the presence of polydimethyldiallylammonium chloride.It is shown, that the excimer formation by static self-quenching of fluorescence of the pyren-3-sulfonate is based on the cooperative effect of the macroion.The association constants of interaction between the aromatic compound and the polycation are determined.Presence of diazoniumcations leads to quenching of fluorescence of pyren-3-sulfonate in both the polyelectrolyte and aqueous phases.The quenching constants are discussed.
