Special Issue "New Studies of Photoisomerization"
A special issue of Molecules (ISSN 1420-3049).
Deadline for manuscript submissions: 26 July 2019
Photoisomerization, which is the photochemical process resulting in a change of isomer, is a very common response upon light irradiation of photoactive molecular systems. It can involve different types of molecular reorganization such as bond rotation, skeletal rearrangements or atom- or group-transfer. Typical examples are cis-trans photoisomerizations, photoinduced cycloadditions, electrocyclic reactions and tautomerizations. Photoisomerization is the primary photochemical reaction of chromophores in several biological photoreceptors. The most prominent example is the cis-trans photoisomerization of the retinal chromophore in rhodopsin which is the primary photochemical event involved in vision. Photoisomerization is often associated with changes in physical and chemical properties of the molecular system: Along with the geometrical rearrangement, it may be accompanied by spectral changes, change of refractive index, dielectric constant, dipole moment, oxidation/reduction potential. This light-activated process is in most cases completely reversible, and the molecules can be switched back and forth between two or more isomeric forms, providing what is commonly known as photoswitches. Photoisomerizable molecules have entered the new generation of innovative functional materials with high added value. Applications are already widespread in nanosciences, biology, and photonic or optoelectronic devices. For example, they have been exploited to develop various technological devices such as sensors, actuators, information storage and processing and high-resolution imaging techniques.
A variety of synthetic photoswitches, that can undergo a reversible change in their structure upon irradiation with light, have been designed. The vast majority of these compounds rely on organic molecules. Among the main groups of compounds that have found numerous applications as switching molecules, one can cite azobenzenes, stilbenes, dihydroazulenes, diarylethenes, spiropyrans and spirooxazines, naphthopyrans, fulgides, fulgimides, and related compounds. Transition metal complexes have also been designed to display photoisomerizable capabilities. These systems are often based on linkage isomerizations between the metal center, and various ambidentate ligands (e.g., sulfoxide, sulfur dioxide, nitrosyl). The advantage of using such inorganic systems lies in the large flexibility available to tune the photoisomerizable properties with the use of different ligands.
This forthcoming Special Issue of Molecules entitled “New Studies of Photoisomerization” will be devoted to photoisomerizable compounds, collecting original contributions both from experimental and theoretical studies.
Prof. Martial Boggio-Pasqua
Manuscript Submission Information
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- molecular design
- optical properties
- time-resolved spectroscopy
- computational photochemistry