Synthesis and properties of amphiphilic photoresponsive gelators for aromatic solvents
A sugar-based photoresponsive supergelator, N-glycosylazobenzene that shows selective gelation of aromatic solvents is described. The partial trans - cis isomerization of the azobenzene moiety allows photoinduced chopping of the entangled gel fibers to short fibers, resulting in controlled fiber length and gel - sol transition. The gelator is useful for the selective removal of toxic aromatic solvents from water.
Synthesis of deuterium-labeled azo dyes of the Sudan family
Carcinogenic amines are formed in vivo during the metabolism of Sudan azo dyes. The identification and assay of these polluting agents requires the availability of deuterated analogues. Accordingly, two series of derivatives labeled on the phenylazo and naphthol moieties were synthesized. The new compounds were obtained in satisfactory chemical yields and with an excellent degree of labeling. The structures were confirmed by 1H NMR spectroscopy and high-resolution mass spectrometry. Georg Thieme Verlag Stuttgart.
De Nino, Antonio,Di Donna, Leonardo,Maiuolo, Loredana,Mazzotti, Fabio,Sindona, Giovanni