Abstract
In this work, experimental isotherms of silver on hexahelicene and heptahelicene were collected at five adsorption temperatures using the quartz crystal microbalance strategy. Two analytical models of statistical physics (MMPG and MMRG) were applied to explain the complexation process of the two helicenes. Based on the physical significance of the two models’ parameters, the silver adsorption was found to be typical to an endothermic phenomenon by the intermediate of the steric variables. Thus, the fitted values of the adsorbed amounts at saturation (QS1 and QS2) were the highest in the case of heptahelicene adsorption. The van der Waals parameters (cohesion pressure a and covolume b) involved in the MMRG model explain the decrease of hexahelicene isotherms at high concentration through the lateral interactions between the adsorbates. Interestingly, the analysis of the complexation energies [|(−E1)| and |(−E2)|] indicated the strongest interaction of silver–[7]helicene. The novel clarifications of the physicochemical description of adsorption isotherms indicated that the heptahelicene can form a stable complex with silver ions.
Highlights
Helicenes are polycyclic aromatic hydrocarbon molecules characterized by their non-planar geometry.1–3 The fully conjugated structure of the helicenes combined with their chiral architecture provided numerous unique characteristics rife for exploitation.4–9 the examination of the interesting optical and electronic properties of these molecules proves to be an immense research field including organic carbo-helicenes or hetero-helicenes.10–14In particular, hexahelicene and heptahelicene are interesting members of the carbo-helicene family.3,9 Benzenoid rings offer an ascent to scaffolding that completes a full turn of the helix.In addition, it appeared that these molecules provide a central cavity suitable for complexing cationic ions considering that the terminal rings are co-facial
We found that the frequency of the coated crystal with hexahelicene is equal to the frequency of the coated crystal with heptahelicene, which confirms that the two different helicenes formed the same type of films
This work aims to investigate the silver–helicene complexes based on the quartz crystal microbalance method
Summary
Benzenoid rings offer an ascent to scaffolding that completes a full turn of the helix It appeared that these molecules provide a central cavity suitable for complexing cationic ions considering that the terminal rings are co-facial. They were employed for the advancement of metallic sandwich systems in organometallic chemistry.. Scitation.org/journal/adv the silver–heptahelicene complex can be used for the construction of solid-state devices (e.g., electric conductors30), no deep investigation has been performed to use heptahelicene as a complexing compound of silver. This is surprising since the previously studied complexes indicated that the complexes of heptahelicene were more stable than the corresponding complexes of hexahelicene.
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