Enantiomer discrimination in absorption spectroscopy and in voltammetry: highlighting fascinating similarities and connections

Structure-Dependence and Mechanistic Insights into the Piezoelectric Effect in Ionic Liquids

“…In the case of CitMIM + , one of the consequences of branching is the presence of a stereocenter, making the molecule chiral. Actually, an isolated stereocenter located on an alkyl side chain, as is the case here, usually results in moderate chirality manifestations relative to other structural features, such as helical or axial stereogenic elements present within the primary molecular backbone or core . Moreover, supramolecular ordering strongly affects chirality manifestations, as made evident by circular dichroism (CD).…”

“…Actually, an isolated stereocenter located on an alkyl side chain, as is the case here, usually results in moderate chirality manifestations relative to other structural features, such as helical or axial stereogenic elements present within the primary molecular backbone or core. 65 Moreover, supramolecular ordering strongly affects chirality manifestations, as made evident by circular dichroism (CD). Macromolecules made of chiral monomer units can have very large chirality manifestations when featuring a regular, tightly packed helical/foldamer secondary structure, or, on the contrary, they can exhibit negligible chirality manifestations if they possess a random coil secondary structure.…”

Electrochemical Insight on the Nitrogen-Rich, Weakly Aromatic Cyclic Triimidazole Multifunctional System Expanded with Pyridine or Thiophene Terminals

“…Moreover, it could be questioned whether the large first UV-Vis absorption peak might actually account for the merging of 1/2/3 processes at slightly decreasing wavelengths, which would be also consistent with the regularly decreasing trend of the maximum wavelength with increasing number of pyridine terminals. An analogy could be found in the case of chiral molecules with axial stereogenicity, featuring two moieties that are at the same time two equivalent redox sites and two equivalent chromophores: voltammetry is usually able to highlight their interaction resulting in twin peak systems, while a single wide absorption peak is usually observed in achiral UV-Vis spectroscopy; however, in circular dichroism spectroscopy a typical sigmoidal signature can be observed, evidencing that a significant difference actually exists in absorption wavelengths for the interacting chromophores [45].…”