Abstract
Single- and two-component monolayers of anthraquinone-2,7-disulfonic acid (2,7-AQDS) and 1-chloro-4-hydroxy-anthraquinone (1,4-AQClOH) have been formed by spontaneous adsorption from low pH supporting electrolyte solutions (typically 1.0 M HClO4 in 80:20 H2O:DMF) and examined using cyclic voltammetry. The voltammetric response for the single monolayers is well defined and the concentration dependence of the surface coverage is well described by the Frumkin adsorption isotherm over the concentration range 1−30 μM for both 2,7-AQDS and 1,4-AQClOH. The saturation coverages (Γsat) are (6.8 ± 0.32) × 10-11 and (1.9 ± 0.15) × 10-10 mol cm-2, respectively, while the adsorption coefficients (β) are (4.9 ± 0.25) × 104 and (7.5 ± 0.5) × 104 M-1. Both monolayers show stabilizing lateral interactions. However, the 2,7-AQDS adsorbates interact more strongly with a Frumkin interaction parameter (g) of −1.62 ± 0.21 being observed compared to −0.21 ± 0.02 for the 1,4-AQClOH monolayers. Mixed monolayers, formed from simul...
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