Volume 131, Issue 34 pp. 11937-11941
Zuschrift

The First Observation of Hidden Hysteresis in an Iron(III) Spin-Crossover Complex

Theerapoom Boonprab

Theerapoom Boonprab

Functional Materials and Nanotechnology Center of Excellence, Walailak University, Thasala, Nakhon Si Thammarat, 80160 Thailand

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Seok J. Lee

Seok J. Lee

MacDiarmid Institute for Advanced Materials and Nanotechnology, Institute of Fundamental Sciences, Massey University, New Zealand

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Prof. Dr. Shane G. Telfer

Prof. Dr. Shane G. Telfer

MacDiarmid Institute for Advanced Materials and Nanotechnology, Institute of Fundamental Sciences, Massey University, New Zealand

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Prof. Dr. Keith S. Murray

Prof. Dr. Keith S. Murray

School of Chemistry, Monash University, Clayton, Victoria, 3800 Australia

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Dr. Wasinee Phonsri

Dr. Wasinee Phonsri

School of Chemistry, Monash University, Clayton, Victoria, 3800 Australia

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Dr. Guillaume Chastanet

Dr. Guillaume Chastanet

CNRS, Universite de Bordeaux, ICMCB, 87 avenue du Dr A. Schweitzer, 33608 Pessac, France

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Prof. Dr. Eric Collet

Prof. Dr. Eric Collet

Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)—UMR 6251, 35000 Rennes, France

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Dr. Elzbieta Trzop

Dr. Elzbieta Trzop

Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)—UMR 6251, 35000 Rennes, France

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Prof. Dr. Guy N. L. Jameson

Prof. Dr. Guy N. L. Jameson

School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010 Australia

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Prof. Dr. Phimphaka Harding

Corresponding Author

Prof. Dr. Phimphaka Harding

Functional Materials and Nanotechnology Center of Excellence, Walailak University, Thasala, Nakhon Si Thammarat, 80160 Thailand

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Prof. Dr. David J. Harding

Corresponding Author

Prof. Dr. David J. Harding

Functional Materials and Nanotechnology Center of Excellence, Walailak University, Thasala, Nakhon Si Thammarat, 80160 Thailand

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First published: 24 June 2019
Citations: 24

Abstract

Molecular magnetic switches are expected to form the functional components of future nanodevices. Herein we combine detailed (photo-) crystallography and magnetic studies to reveal the unusual switching properties of an iron(III) complex, between low (LS) and high (HS) spin states. On cooling, it exhibits a partial thermal conversion associated with a reconstructive phase transition from a [HS-HS] to a [LS-HS] phase with a hysteresis of 25 K. Photoexcitation at low temperature allows access to a [LS-LS] phase, never observed at thermal equilibrium. As well as reporting the first iron(III) spin crossover complex to exhibit reverse-LIESST (light-induced excited spin state trapping), we also reveal a hidden hysteresis of 30 K between the hidden [LS-LS] and [HS-LS] phases. Moreover, we demonstrate that FeIII spin-crossover (SCO) complexes can be just as effective as FeII systems, and with the advantage of being air-stable, they are ideally suited for use in molecular electronics.

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