1190095-66-9Relevant academic research and scientific papers
Photoresponsive switches at surfaces based on supramolecular functionalization with azobenzene-oligoglycerol conjugates
Nachtigall, Olaf,K?rdel, Christian,Urner, Leonhard H.,Haag, Rainer
supporting information, p. 9669 - 9673 (2015/02/05)
The synthesis, supramolecular complexation, and switching of new bifunctional azobenzene-oligoglycerol conjugates in different environments is reported. Through the formation of host-guest complexes with surface immobilized β-cyclodextrin receptors, the bifunctional switches were coupled to gold surfaces. The isomerization of the amphiphilic azobenzene derivatives was examined in solution, on gold nanoparticles, and on planar gold surfaces. The wettability of functionalized gold surfaces can be reversibly switched under light-illumination with two different wavelengths. Besides the photoisomerization processes and concomitant effects on functionality, the thermal cis to trans isomerization of the conjugates and their complexes was monitored. Thermal half-lives of the cis isomers were calculated for different environments. Surprisingly, the half-lives on gold nanoparticles were significantly smaller compared to planar gold surfaces. The thermal and light-induced photoisomerization of bifunctional azobenzene-oligoglycerol conjugates was examined in solution and on supramolecularly functionalized gold nanoparticles and planar gold surfaces. The wettability of the functionalized gold surfaces could be reversibly switched with light. Thermal half-lives of Z-isomers were determined for different environments to provide information about the stability of the functional switches for further applications.
Oxidations of Aromatic Amines by Superoxide Ion
Crank, George,Makin, Mohammad I. H.
, p. 845 - 855 (2007/10/02)
Superoxide ion acts as a mild and highly selective oxidizing agent for aromatic amines.Aniline and α-naphthylamine were not oxidized, but β-naphthylamine formed dibenzophenazine, dibenzophenazine and 2,2'-azonaphthalen-1-ol. o- and p-Diamines are oxidized to diaminoazobenzenes but m-diamines are unreactive.Similarly o- and p-aminophenols are oxidized to dihydroxyazobenzenes but m-aminophenols are unaffected, and o-mercaptoaniline forms the disulfide.The oxidations are considered to be free-radical processes, initiated by hydrogen abstraction by superoxide from the substrates.The biological significance of the results is discussed.
Organic chemistry of superoxide. I. Oxidations of aromatic compounds.
Crank,Makin
, p. 2169 - 2170 (2007/10/05)
Potassium superoxide is a selective oxidant for aromatic compounds with the order of susceptibility of substituent groups being -SH>-NH2-OH. Only o- and p- disubstituted amines and phenols are oxidized but monosubstituted thiols react.
