Dynamic Supramolecular Ruthenium-based Gels Responsive To Visible/NIR Light And Heat.

Author(s) Teasdale, I.; Theis, S.; Iturmendi, A.; Strobel, M.; Hild, S.; Jacak, J.; Mayrhofer, P.; Monkowius, U.
Journal Chemistry
Date Published 2019 Jun 14
Abstract

A simple supramolecular crosslinked gel is reported with a photosensitive ruthenium bipyridine complex functioning as a crosslinker and poly(4-vinylpyridine) (P4VP) as a macromolecular ligand. Irradiation of the organogels in H2O/MeOH with visible and near infrared (NIR) light (in a multi-photon process) leads to cleavage of pyridine moieties from the ruthenium complex breaking the cross-links and causing degelation and hence solubilisation of the P4VP chains. Real time (RT) photorheology experiments of thin films showed a rapid degelation in several seconds while larger bulk samples could also be photocleaved. Furthermore, the gels could be reformed or healed by simple heating of the system and restoration of the metal-ligand cross-links. The relatively simple dynamic system with a high sensitivity towards light in the visible and NIR region make them interesting positive photoresists for nano/ micropatterning applications, as was demonstrated by writing, erasing and rewriting of the gels by single and multiphoton lithography.

DOI 10.1002/chem.201902088
ISSN 1521-3765
Citation Teasdale I, Theis S, Iturmendi A, Strobel M, Hild S, Jacak J, et al. Dynamic Supramolecular Ruthenium-based Gels Responsive To Visible/NIR Light And Heat. Chemistry. 2019.