Exploiting Coordination Isomerism for Controlled Self-Assembly.

Nils Bäumer,Gustavo Fernández,Naveen Kumar Allampally,Kalathil K. Kartha,Shiki Yagai,Rodrigo Q. Albuquerque

doi:10.1002/anie.201908002

Abstract

We exploited the inherent geometrical isomerism of a PtII complex as a new tool to control supramolecular assembly processes. UV irradiation and careful selection of solvent, temperature, and concentration leads to tunable coordination isomerism, which in turn allows fully reversible switching between two distinct aggregate species (1D fibers↔2D lamellae) with different photoresponsive behavior. Our findings not only broaden the scope of coordination isomerism, but also open up exciting possibilities for the development of novel stimuli‐responsive nanomaterials.

Highlights

We exploited the inherent geometrical isomerism of a PtII complex as a new tool to control supramolecular assembly processes
PtII compounds have been reported to undergo geometrical isomerization upon UV irradiation, leading to photostationary states whose isomer composition primarily depends on the choice of ligands and solvent.[2,3]
Geometrical isomerization of PtII complexes has been exclusively investigated at the molecular level, for instance to obtain otherwise inaccessible coordination compounds,[4] rotors,[5] and photoactivated catalysts.[6]

Summary

Introduction

We exploited the inherent geometrical isomerism of a PtII complex as a new tool to control supramolecular assembly processes. In an attempt to broaden the scope of coordination isomerism, we reasoned that the inherently different geometry of cis and trans PtII complexes might be exploited as a new method to control self-assembly processes.

Results

Conclusion