The effect of surface attachment on ligand binding: studying the association of Mg2+, Ca2+ and Sr2+ by 1-thioglycerol and 1,4-dithiothreitol monolayers.

摘要: The difference in the heterogeneous binding of Mg2+, Ca2+ and Sr2+ ions by 1-thioglycerol (TG) 1,4-dithiothreitol (DTT) spontaneously adsorbed monolayers on Au has been studied following changes double layer capacity. A mathematical treatment, based calculating electrochemical potential at monolayer–electrolyte interface, followed our recent work which dealt with acid–base equilibrium interface as a means pK ionizable SAMs their Cd2+. Experimentally, TG DTT were assembled surfaces impedance spectroscopy alternating current voltammetry (ACV). capacity was measured for each modified increasing concentrations divalent metal separately. goal this study to examine effect ion similar ligands that are differently attached onto surface. differ flexibility, is result attachment surface through one two arms, respectively. general trend apparent association constants ions, calculated from measurements, substantially different classical Irving–Williams series applicable homogeneous systems. This could be nicely explained reduction degree freedom flexibility ligands.