474746-06-0Relevant articles and documents
Selective and cyclic detection of Cr3+ using poly(methylacrylic acid) monolayer protected gold nanoparticles
Li, Junbo,Han, Chen,Wu, Wenlan,Zhang, Shijie,Guo, Jinwu,Zhou, Huiyun
, p. 717 - 722 (2014)
A colorimetric gold nanoparticle-based sensor, a monolayer of poly(methylacrylic acid)-modified gold nanoparticles (PMAA@Au NPs), was developed for selective detection of Cr3+ ions in aqueous solution. In the presence of Cr3+, PMAA@Au NPs are aggregated by a chelation process, which caused the prominent color changes in response to carboxyl groups in the sensor. Furthermore, the selective detection of Cr3+ in aqueous solution was achieved over 11 other metal ions. The metal complexes were characterized by UV-vis spectroscopy and transmission electron microscopy. In addition, the chelation-dissociation process was reversible via addition of a strong metal ion chelator such as EDTA. The colorimetric sensor used for detecting Cr3+ was able to be recycled at least three times by monitoring optical changes of the PMAA@Au NPs.
CONTINUOUS FLOW SYNTHESIS OF DITHIOESTER COMPOUNDS
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Paragraph 0101, (2014/10/04)
The present technology relates to methods of producing various dithioester-containing compounds via continuous flow reactors.
Reaction of cyclic tetrathiophosphates with carboxylic acids as a means to generate dithioesters and control radical polymerization by RAFT
Dureault, Alex,Gnanou, Yves,Taton, Daniel,Destarac, Mathias,Leising, Frederic
, p. 2869 - 2872 (2007/10/03)
Radical control: Controlled free-radical polymerization of styrene and methyl (meth)acrylate is achieved by using Davy reagents or P4S10 in conjunction with benzoic acid, which leads to in situ formation of dithioesters that act as chain-transfer agents and thus control the reaction. In the case of P4S10/PhCOOH, d[thiobenzoic acid is the key intermediate in this process (see scheme).
