Thiols group frequencies

The self-assembly of the 2 1 smectite-type clay containing thiol groups on Au was performed in a chloroform suspension of clay [91]. The formation of a monolayer or a partial double layer was demonstrated from the frequency change. In other studies on the clay-modified electrodes, the clay-precoated QCM was used to examine the swelling of the clay films, and the adsorption and redox of the metal complexes. 

Characteristic group frequencies of thiols are shown in Figure 40. The S-H stretching vibration of aliphatic and aromatic thiols gives rise to a medium to. strong Raman line at 2.590-2530 cm this band is weak or very weak in the infrared. 

Over an observation period of 20 min, the thiol moieties of the chitosan-TGA/H2O2 system were not completely oxidized more than 60% of thiol groups remained stable. Moreover, evidence for an increase in the crosslinking of thiolated chitosans as a function of time was provided by frequency sweep measurements. 

The properties of sulfur-rich, mononuclear Fe(CO) compounds as described by the group of Sellmann (Sellmann et al. 1996) alerted the hydrogenase workers that the protonation of a thiol ligand to Fe shifts the v(CO) in such compounds by about 40cm to higher frequency, whereas the redox potential of the Fe ion increases by 500-600 mV. 

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