Quinolinol reduction

ZnTe The electrodeposition of ZnTe was published quite recently [58]. The authors prepared a liquid that contained ZnGl2 and [EMIM]G1 in a molar ratio of 40 60. Propylene carbonate was used as a co-solvent, to provide melting points near room temperature, and 8-quinolinol was added to shift the reduction potential for Te to more negative values. Under certain potentiostatic conditions, stoichiometric deposition could be obtained. After thermal annealing, the band gap was determined by absorption spectroscopy to be 2.3 eV, in excellent agreement with ZnTe made by other methods. This study convincingly demonstrated that wide band gap semiconductors can be made from ionic liquids. 

Hua et al. [507] described an automated method for determination of molybdenum in seawater by means of constant-current reduction of the adsorbed 8-quinolinol complex in a computerised flow potentiometric stripping analyser. The complex was adsorbed onto a molybdenum film electrode at -0.2 V and stripped at -0.42 V. The authors report measuring molybdenum at 8.9 1.3 xg/l in reference seawater NASS-1, with a certified value of 11.5 1.9 xg/l. 

ZnTe is usually applied in switching devices and in solar cells. It is one of the II—VI compound semiconductors with a direct band gap of 2.3 eV at room temperature. The electrodeposition of ZnTe was investigated by Sun et al. in the Lewis basic ZnCl2/l-ethyl-3-methylimidazolium ionic liquid containing propylene carbonate as a cosolvent at 40 °C [37]. 8-Quinolinol was added to the solution to shift the reduction of Te(IV) to more negative potential, thus facilitating the codeposition. The composition of the ZnTe deposits is dependent on the deposition potential and... 

Hydrogenolysis and reduction of esters or lactones to hydrocarbons are difficult. The reaction is easy with esters of aromatic acids and pyridinol or quinolinol ... 

The electrochemistry of six-coordinate oxotechnctium(V) complexes containing Schiff-base and 8-quinolinol ligands was studied in solutions of acetonitrile and DMF. The main features of the reactions are the reduction of Tc(V) to Tc(lV), the subse-... 

The data collection protocol employed to pick out the absorptions of interest is generally a difference data manipulation, which varies according to the type of spectrometer employed. The early in situ infrared studies were carried out using dispersive infrared spectrometers with their attendant low power sources and noisy detectors. The simplest approach to the sensitivity problem is exemplified by the first in situ infrared paper by Mark and Pons [39], which reported a study of the reduction of 8-quinolinol solution by electrolysis at —1.8V until sufficient... 

The first infrared spectroelectrochemistry was reported in 1966 by Harry Mark and Stan Pons (30). As a postdoc at Cal Tech with Fred Anson, Mark (Figure 6) had visited Kuwana at Riverside — a visit that sparked his interest in spectroelectrochemistry. He also visited the electrochemistry group at the Science Center where he discussed internal reflection spectroelectrochemistry with Hansen. Upon his arrival at the University of Michigan as an assistant professor, Mark decided to try to develop infrared internal reflection spectroelectrochemistry because of the structural information in an infrared spectrum. He was able to persuade Paul Wilks (Wilks Scientific Corp.) to lend him a double beam internal reflectance attachment. A Ge internal reflectance plate-electrode was made by Recticon Corp. from n-type semiconducting Ge, which was already known to function as a working electrode (31,32). Stan Pons, a first year graduate student, performed the experimental work in which the spectra of the reduction products of 8-quinolinol and tetramethylbenzidine free radical were chracterized. 

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