2D Phase transition of organic molecules adsorbed at the Hg electrode/aqueous solution interface Part 2 Comparison of experimental data with model predictions

Formation and Dissolution Processes of the 6-Thioguanine (6TG) Self-Assembled Monolayer. A Kinetic Study

“…It is of interest to note that this magnitude is positive, in contrast with the value obtained for the adenine phase transition that is negative. [35][36][37] The value is in agreement with processes that take place through the formation of strong bonds with the surface.…”

“…On the contrary, in an acidic medium, the 6MP molecules form a diluted phase that, under determined experimental conditions, is transformed into a condensed phase of physisorbed molecules that are thought to adopt a flat orientation, according to the results of adenine. [33][34][35][36][37] This is also the case for the interfacial behavior of 6TG under acidic conditions. 10 In the physisorbed region II (Figure 2), the 6TG molecules can be either coadsorbed with weakly hydrogen-bonded interfacial water giving rise to a low coverage film or interconnected by directional hydrogen bonds forming a 2D condensed physisorbed film.…”

“…In an alkaline medium, upon reduction of the S−Hg bond, the 6MP molecules are in a situation of weak adsorption at the Hg surface. On the contrary, in an acidic medium, the 6MP molecules form a diluted phase that, under determined experimental conditions, is transformed into a condensed phase of physisorbed molecules that are thought to adopt a flat orientation, according to the results of adenine. − This is also the case for the interfacial behavior of 6TG under acidic conditions …”

Characterization of n-alkanethiol self-assembled monolayers on mercury by impedance spectroscopy and potentiometric measurements

“…These characteristics, along with the very high affinity of mercury toward a variety of organic molecules, make it an ideal substrate for assembling pinholes-free SAMs. Accordingly, condensed films of substances such as fatty acids [14][15][16], alcohols [17][18][19][20], quinolines [21], uracil derivatives [22,23], phospholipids [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] etc. have been formed on Hg and studied using, in particular, capacity as well as voltammetric measurements.…”

Electrochemical formation and investigation of a self-assembled [60]fullerene monolayer

“…À can be an important factor promoting the self-assembly of monolayers. 56 For a one electron reduction, the charge density s would correspond to a surface concentration G = 9.0 Â 10 À7 mol m À2 or, equivalently, an area per molecule a m = 185 A ˚2. These values should be considered as an upper coverage limit, since the non-faradaic contribution has not been taken into account in the calculation.…”