Electrochemical Study of a Dendritic Family at the Water/1,2-Dichloroethane Interface

Abstract

The transfer of six dendritric molecules, DMs, across the water/1,2-dichloroethane interface was investigated using cyclic voltammetry. From the variation of peak potential with pH, two different mechanisms of transfer were postulated depending on the nature of the molecules. Voltammetric parameters were employed to evaluate the hydrophilic/hydrophobic character and calculate the acid dissociation constant of these molecules. The results were explained taking into account the nature and multiplicity of functional surface groups.

Voltammetry for surface-active ions at polarisable liquid|liquid interfaces

“…in the case of amphiphilic surfactant [9,[13][14][15][16] or transfer followed by adsorption e.g. in the case of polyelectrolyte, polypeptide or dendrimer transfer reactions [17][18][19][20][21][22][23][24]. Furthermore, one of the most biologically relevant systems is that of phospholipid monolayers in which adsorption and facilitated ion transfer reactions are closely related [25][26][27][28].…”

Decorating soft electrified interfaces: From molecular assemblies to nano-objects

“…Interfacial behaviour of these species gives very characteristic voltammetric fingerprints: (i) peak to peak separation deviates from 59/z mV; (ii) reverse peaks are terminated by the abrupt drop in current; (iii) charge transfer peak current at macroscopic liquidliquid interface do not follow ∝ √ ( being scan rate) dependency and (iv) shift of the peak position towards higher ∆ for increasing concentration of interfacially active speciesindicating higher resistance to the charge transfer reaction. These indications were observed for electrochemically driven interfacial adsorption of few class of macromolecular species including polyelectrolytes [30][31][32][33][34][35][36][37][38][39], polyamidoamide [40][41][42][43], polypropylenimine [44] and poly-L-lysine [45] dendrimers among others [46,47] peptides [48,49] and proteins [28,[50][51][52][53]. The interfacial adsorption of biological macromolecules brings exciting applications towards the field which are still not sufficiently studied.…”

Dendronization: A Useful Synthetic Strategy to Prepare Multifunctional Materials

“…Recently, we reported on the hydrophobic/hydrophilic balance of a family of dendrons bearing different nature and multiplicity of functional groups on their periphery (Figure 4(b)). We analyzed the effect of branching in the resulting properties of the material [80]. Our results show that the presence of -CN moieties in the surface increases the hydrophilic character, whereas the tert-butyl ester groups increase the hydrophobic character.…”