Solute−Solvent Interactions Determine the Effect of External Electric Field on the Intensity of Molecular Absorption Spectra

Abstract

The study of the electronic absorption spectra of 4-aminoazobenzene subjected to an external electric field in nonpolar and polar solvents shows that the field-induced change in the absorption intensity is dominated by the solvent-solute interaction. Moreover, solvent can determine the sign of the change of the absorption intensity. These experimental observations are supported by ab initio electronic structure calculations and are rationalized by analytic theory. The results carry particular importance for the numerous fundamental and practical applications of electric fields to understanding and design of new materials and biological systems.

Origin of Solubility Behavior of Polar π-Conjugated Crystals in Mixed Solvent Systems

“…However, this description is limited since it neglects the intermolecular interactions between solute and solvent molecules and the identity of the solvent . When a solute dissolves in a solvent, the solvation effect induced by favorable intermolecular interactions between solute and solvent molecules strongly depends on their chemical structures. , For organic molecules with a relatively large size and various substituents, intermolecular interactions between solute and solvent molecules are rather complicated. − Therefore, understanding intermolecular interactions in solution, which are related to the origin of solubility of organic crystals, is very important.…”

Infrared Electroabsorption Spectroscopy of N,N-Dimethyl-p-nitroaniline in Acetonitrile/C2Cl4: Solvation of the Solute and Self-Association of Acetonitrile

“…Electroabsorption spectroscopy, also known as Stark spectroscopy, can probe those responses as changes in absorption spectra. This method has been extensively used in the visible region − and has found many applications in diverse systems ranging from gas-phase molecules , to complex biological systems . Infrared (IR) electroabsorption spectroscopy is a branch of Stark spectroscopy that looks at vibrational transitions instead of electronic transitions.…”

Dipolar chains and 2D aligned stripes of polymer‐coated magnetic iron colloid

“…For this purpose, we have considered three kinds of environments: (a) a constant electric field, (b) DMAB..BCD inclusion complex, (c) charge set surrounding the DMAB, (d) continuum solvent plus (b) and (c). In this way, we are dealing just with the electrostatic effects on the DMAB optical properties, since according to the results found in the literature,18–20 such an interaction could be the main responsible on the optical response enhancement, but to date this has not been confirmed. To corroborate such a hypothesis, we performed a computational study on the DMAB properties under the action of an electrostatic potential.…”