Reversible Photocycloadditions, a Powerful Tool for Tailoring (Nano)Materials

Abstract

Molecularly designed materials are increasingly attracting attention not only because of the variety of their applications but also due to the challenging strategies necessary for their design and synthesis. Highly complex and functional (nano) materials are obtained by exploiting simple tools and concepts from different disciplines, introducing the desired properties into the fi nal product. It is shown that by combining fundaments from organic chemistry, polymer and materials science, photoresponsive nanoparticles are easily generated, and how responsiveness is achieved by exploiting photocycloadditions, which are extremely selective, react in good yields without the formation of side products, proceed under benign conditions, and present the great advantage of being reversible.

Light‐Induced Reversible Self‐Assembly of Gold Nanoparticles Surface‐Immobilized with Coumarin Ligands

“…Additionally, the optical absorption of the solvent must also be considered because of the detrimental optical filter effect. The reversible photoreaction of coumarin has been used to control the increase and decrease of colloidal clusters in tetrahydrofuran (THF); unfortunately, reversible photocrosslinking of the clusters failed, possibly because of the irreversible damage of coumarin molecules caused by strong UV irradiation ,. The recent report by Zhang et al .…”

Advances in intrinsic self-healing polyurethanes and related composites

“…Coumarine, cinnamate and anthracene derivatives are the most reported moieties promoting Diels-Alder dimerization reaction. 68 Coumarine-based polyurethanes have been developed using different synthetic coumarine-based diol or monoalcohol structures and appropriate exible so segment and isocyanate coupling agent (Fig. 8).…”

Different synthetic pathways of nanoparticle-cored dendrimers (NCDs): Effects on the properties and their application as redox active centers

“…Thus, ligand exchange, chemical functionalization with small organic molecules, dendritic and linear (co‐)polymers, as well as layer‐by‐layer deposition and monomer polymerization are some examples of those strategies to enhance—among others—the NPs' reactivity, stability, and dispersibility . Moreover, these surface functionalizations allow for the simultaneous incorporation of different functional groups, which may be exploited afterward for further physical/chemical functionalization of the NPs toward specific applications …”

“…10 Moreover, these surface functionalizations allow for the simultaneous incorporation of different functional groups, which may be exploited afterward for further physical/chemical functionalization of the NPs toward specific applications. [11][12][13][14][15] In the present contribution, we focused on the organic surface modification of inorganic NPs (c-Fe 2 O 3 ) combining different strategies, the evaluation on how each modifier acts and interacts with the other modifiers and with the medium in which the final product is, along with the subsequent study of applicability of the resulting nanohybrids toward the generation of electrochemical sensors. To obtain the nanohybrids, a combination of organic functionalizations consisting in silanization and dendronization was carried out.…”