Multiswitchable Photoacid-hydroxyflavylium-polyelectrolyte Nano-assemblies

Overview

Journal Beilstein J Org Chem

Specialty Chemistry

Date 2021 Feb 10

PMID 33564327

Citations 1

Authors

Alexander Zika

Franziska Grohn

Affiliations

Soon will be listed here.

Abstract

Light- and pH-responsive nano-assemblies with switchable size and structure are formed by the association of a photoacid, anthocyanidin, and a linear polyelectrolyte in aqueous solution. Specifically, anionic disulfonated naphthol derivatives, neutral hydroxyflavylium, and cationic poly(allylamine) are used as building blocks for the ternary electrostatic self-assembly, forming well-defined supramolecular assemblies with tunable sizes of 50 to 500 nm. Due to the network of possible chemical reactions for the anthocyanidin and the excited-state dissociation of the photoacid upon irradiation, different ways to alter the ternary system through external triggering are accessible. The structure and trigger effects can be controlled through the component ratios of the samples. Dynamic and static light scattering (DLS, SLS) and ζ-potential measurements were applied to study the size and the stability of the particles, and information on the molecular structure was gained by UV-vis spectroscopy. Isothermal titration calorimetry (ITC) provided information on the thermodynamics and interaction forces in the supramolecular assembly formation.

Citing Articles

Photoacids and Photobases: Applications in Functional Dynamic Systems.

Yucknovsky A, Amdursky N Angew Chem Int Ed Engl. 2025; 64(9):e202422963.

PMID: 39888194 PMC: 11848990. DOI: 10.1002/anie.202422963.

Functional Nano-Objects by Electrostatic Self-Assembly: Structure, Switching, and Photocatalysis.

Krieger A, Zika A, Grohn F Front Chem. 2022; 9:779360.

PMID: 35359487 PMC: 8961288. DOI: 10.3389/fchem.2021.779360.

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