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A Guideline to the Design of Molecular-Based Materials with Long-Lived Photomagnetic Lifetimes

Authors

  • Jean-François Létard Dr.,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • Philippe Guionneau Prof.,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • Olivier Nguyen,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • José Sánchez Costa,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • Silvia Marcén Dr.,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • Guillaume Chastanet Dr.,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • Mathieu Marchivie Dr.,

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
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  • Laurence Goux-Capes Dr.

    1. Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS - Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France, Fax. (+33) 540-002-649
    2. DSM/DRECAM/SCM, CEA-Saclay, 91 191 Saclay, France
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  • Abbreviations used in this paper: bpp=2,6-bis(pyrazol-3-yl)pyridine, dppen=cis-1,2-bis(diphenylphosphino)ethylene, PM-AzA=(N-2′-pyridylmethylene)-4-(2-phenylazo)aniline, PM-BiA=(N-2′-pyridylmethylene)-4-aminobiphenyl, ptz=1-propyltetrazole, papth=2-(2-pyridylamino)-4-(2-pyridyl)thiazole, Hpap=2-hydroxylphenyl-(N-2′-pyridylmethylene), tpy=2,2′:6′,2′′-terpyridine.

Abstract

Materials presenting a stable and reversible switch of physical properties in the solid state are of major interest either for fundamental interests or potential industrial applications. In this context, the design of metal complexes showing a light-induced crossover from one spin state to another, leading to a major change of magnetic and optical properties, is probably one of the most appealing challenges. The so-denoted spin-crossover materials undergo, in some cases, a reversible photoswitch between two magnetic states, but, unfortunately, lifetimes of the photomagnetic states for compounds known so far are long enough only at low temperatures; this prohibits any applications. We have measured and collected the temperatures above which the photomagnetic effect disappears for more than sixty spin-crossover compounds. On the basis of this large data base, a correlation between the nature of the coordination sphere of the metal and the photomagnetic lifetime can be drawn. Such correlation allows us to propose here a general guideline for the rational design of materials with long-lived photomagnetic lifetimes. This result clearly opens the way towards room-temperature photonic materials, based on the spin-crossover phenomenon, which will be of great interest for future communication devices.

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