Rotaxane ptII-complexes: Mechanical bonding for chemically robust luminophores and stimuli responsive behaviour

Zhihui Zhang; Graham J. Tizzard; J. A.Gareth Williams; Stephen M. Goldup

doi:10.1039/c9sc05507j

Rotaxane pt^II-complexes: Mechanical bonding for chemically robust luminophores and stimuli responsive behaviour

Zhihui Zhang, Graham J. Tizzard, J. A.Gareth Williams, Stephen M. Goldup^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

We report an approach to rotaxanes in which the metal ion of a cyclometallated Pt^II luminophore is embedded in the space created by the mechanical bond. Our results show that the interlocked ligand environment stabilises a normally labile Pt^II-triazole bond against displacement by competing ligands and that the crowded environment of the mechanical bond retards oxidation of the Pt^II centre, without perturbing the photophysical properties of the complex. When an additional pyridyl binding site is included in the axle, the luminescence of the Pt^II centre is quenched, an effect that can be selectively reversed by the binding of Ag^I. Our results suggest that readily available interlocked metal-based phosphors can be designed to be stimuli responsive and have advantages as stabilised triplet harvesting dopants for device applications.

Original language	English
Pages (from-to)	1839-1847
Number of pages	9
Journal	Chemical Science
Volume	11
Issue number	7
DOIs	https://doi.org/10.1039/c9sc05507j
Publication status	Published - 21 Feb 2020

Bibliographical note

Funding Information:
This work was supported nancially by the China Scholarship Council (studentship to ZZ) and the European Research Council (Consolidator Grant to SMG, agreement no. 724987). The authors thank Dr J. E. M. Lewis (Imperial College) for assistance with SCXRD and helpful discussions.

Publisher Copyright:
This journal is © The Royal Society of Chemistry.

ASJC Scopus subject areas

General Chemistry

Access to Document

10.1039/c9sc05507j

Cite this

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title = "Rotaxane ptII-complexes: Mechanical bonding for chemically robust luminophores and stimuli responsive behaviour",

abstract = "We report an approach to rotaxanes in which the metal ion of a cyclometallated PtII luminophore is embedded in the space created by the mechanical bond. Our results show that the interlocked ligand environment stabilises a normally labile PtII-triazole bond against displacement by competing ligands and that the crowded environment of the mechanical bond retards oxidation of the PtII centre, without perturbing the photophysical properties of the complex. When an additional pyridyl binding site is included in the axle, the luminescence of the PtII centre is quenched, an effect that can be selectively reversed by the binding of AgI. Our results suggest that readily available interlocked metal-based phosphors can be designed to be stimuli responsive and have advantages as stabilised triplet harvesting dopants for device applications.",

author = "Zhihui Zhang and Tizzard, {Graham J.} and Williams, {J. A.Gareth} and Goldup, {Stephen M.}",

note = "Funding Information: This work was supported nancially by the China Scholarship Council (studentship to ZZ) and the European Research Council (Consolidator Grant to SMG, agreement no. 724987). The authors thank Dr J. E. M. Lewis (Imperial College) for assistance with SCXRD and helpful discussions. Publisher Copyright: This journal is {\textcopyright} The Royal Society of Chemistry.",

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AU - Zhang, Zhihui

AU - Tizzard, Graham J.

AU - Williams, J. A.Gareth

AU - Goldup, Stephen M.

N1 - Funding Information: This work was supported nancially by the China Scholarship Council (studentship to ZZ) and the European Research Council (Consolidator Grant to SMG, agreement no. 724987). The authors thank Dr J. E. M. Lewis (Imperial College) for assistance with SCXRD and helpful discussions. Publisher Copyright: This journal is © The Royal Society of Chemistry.

PY - 2020/2/21

Y1 - 2020/2/21

N2 - We report an approach to rotaxanes in which the metal ion of a cyclometallated PtII luminophore is embedded in the space created by the mechanical bond. Our results show that the interlocked ligand environment stabilises a normally labile PtII-triazole bond against displacement by competing ligands and that the crowded environment of the mechanical bond retards oxidation of the PtII centre, without perturbing the photophysical properties of the complex. When an additional pyridyl binding site is included in the axle, the luminescence of the PtII centre is quenched, an effect that can be selectively reversed by the binding of AgI. Our results suggest that readily available interlocked metal-based phosphors can be designed to be stimuli responsive and have advantages as stabilised triplet harvesting dopants for device applications.

AB - We report an approach to rotaxanes in which the metal ion of a cyclometallated PtII luminophore is embedded in the space created by the mechanical bond. Our results show that the interlocked ligand environment stabilises a normally labile PtII-triazole bond against displacement by competing ligands and that the crowded environment of the mechanical bond retards oxidation of the PtII centre, without perturbing the photophysical properties of the complex. When an additional pyridyl binding site is included in the axle, the luminescence of the PtII centre is quenched, an effect that can be selectively reversed by the binding of AgI. Our results suggest that readily available interlocked metal-based phosphors can be designed to be stimuli responsive and have advantages as stabilised triplet harvesting dopants for device applications.

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