Taming Tris(bipyridine)ruthenium(II) and Its Reactions in Water by Capture/Release with Shape-Switchable Symmetry-Matched Cyclophanes

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2022 Mar 11

PMID 35274938

Authors

Chaoyi Yao

Hongyu Lin

Brian Daly

Yikai Xu

Warispreet Singh

H Q Nimal Gunaratne

Wesley R Browne

Steven E J Bell

Peter Nockemann

Meilan Huang

Paul Kavanagh

A Prasanna de Silva

Affiliations

Soon will be listed here.

Abstract

Electron/proton transfers in water proceeding from ground/excited states are the elementary reactions of chemistry. These reactions of an iconic class of molecules─polypyridineRu(II)─are now controlled by capturing or releasing three of them with hosts that are shape-switchable. Reversible erection or collapse of the host walls allows such switchability. Some reaction rates are suppressed by factors of up to 120 by inclusive binding of the metal complexes. This puts nanometric coordination chemistry in a box that can be open or shut as necessary. Such second-sphere complexation can allow considerable control to be exerted on photocatalysis, electrocatalysis, and luminescent sensing involving polypyridineRu(II) compounds. The capturing states of hosts are symmetry-matched to guests for selective binding and display submicromolar affinities. A perching complex, which is an intermediate state between capturing and releasing states, is also demonstrated.

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