Light-induced excited-spin-state trapping: evidence from variable temperature Fourier transform measurements

Herber, R. H.; Casson, L. M.

doi:10.1021/ic00226a025

Cited by 64 publications

(29 citation statements)

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“…These types of magnetic curves, showing a thermallyinduced ET at high temperature in cooling/heating modes and a light-induced effect at low temperature, have been well described for SCO compounds. [27,29] Additionally, SCO and ET mechanisms generate concomitant changes of magnetic and optical properties, which lead to photomagnetic and photochromic properties. These aspects are very important for applications because the optical properties can be used for devices and sensors.…”

Section: Photomagnetism In Molecular Analogsmentioning

confidence: 99%

Metal‐to‐Metal Electron Transfer: A Powerful Tool for the Design of Switchable Coordination Compounds

Mathonière

2017

Eur J Inorg Chem

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Since the report of photomagnetic effects in Prussian blue Fe/Co networks 20 years ago by the Japanese group of Hashimoto, a substantial family of molecular analogs have been obtained and characterized. These compounds offer a unique opportunity to follow metal‐to‐metal electron transfer by investigating their structural, spectroscopic, electrochemical and magnetic properties. We propose an overview of recent results in order to highlight the common features of these coordination compounds, as well as the differences, with the well‐known class of photomagnetic coordination compounds based on spin‐crossover.

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Section: Photomagnetism In Molecular Analogsmentioning

confidence: 99%

Metal‐to‐Metal Electron Transfer: A Powerful Tool for the Design of Switchable Coordination Compounds

Mathonière

2017

Eur J Inorg Chem

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“…The T(LIESST) approach: The first attempt for a rational view of the stability of the photoinduced HS state was reported by Herber et al [16,17] Thanks to infrared spectroscopy, the authors were able to follow the temperature dependency of the CN stretching mode of six different SCO materials and determined a limiting temperature above which the light-induced phenomenon is no more observable. Later on Hauser reported in 1991 the first guideline giving some expectation of the lifetime of the photoinduced HS state.…”

Section: Photoinduced Hs Statementioning

confidence: 99%

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

Létard

Guionneau

Nguyen

et al. 2005

Chemistry A European J

245

231

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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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“…Spin-crossover (SCO) molecules have been the object of many studies 1-4 since their discovery by Cambi and Szegö. 5 This category of metal-organic complexes can undergo a spin transition under the influence of external stimuli (temperature, light, [6][7][8][9][10][11] ligand-driven, 12 X-rays, 13,14 pressure, 15 magnetic field, 16 and current and electric field 17 ). The interest in low-dimensional systems based on spin-crossover molecules has recently seen a significant development, 3,6,18,19 driven by potential technical applications as displays, sensors and memories such as memristors, 17 nano-sized cantilevers, and other emerging applications.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis and change of transition temperature in thin films of Fe{[Me2Pyrz]3BH}2, a new sublimable spin-crossover molecule

Davesne

Gruber

Studniarek

et al. 2015

The Journal of Chemical Physics

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Thin films of the spin-crossover (SCO) molecule Fe{[Me2Pyrz]3BH}2 (Fe-pyrz) were sublimed on Si/SiO2 and quartz substrates, and their properties investigated by X-ray absorption and photoemission spectroscopies, optical absorption, atomic force microscopy, and superconducting quantum interference device. Contrary to the previously studied Fe(phen)2(NCS)2, the films are not smooth but granular. The thin films qualitatively retain the typical SCO properties of the powder sample (SCO, thermal hysteresis, soft X-ray induced excited spin-state trapping, and light induced excited spin-state trapping) but present intriguing variations even in micrometer-thick films: the transition temperature decreases when the thickness is decreased, and the hysteresis is affected. We explain this behavior in the light of recent studies focusing on the role of surface energy in the thermodynamics of the spin transition in nano-structures. In the high-spin state at room temperature, the films have a large optical gap (∼5 eV), decreasing at thickness below 50 nm, possibly due to film morphology.

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Light-induced excited-spin-state trapping: evidence from variable temperature Fourier transform measurements

Cited by 64 publications

References 0 publications

Metal‐to‐Metal Electron Transfer: A Powerful Tool for the Design of Switchable Coordination Compounds

Metal‐to‐Metal Electron Transfer: A Powerful Tool for the Design of Switchable Coordination Compounds

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

Hysteresis and change of transition temperature in thin films of Fe{[Me2Pyrz]3BH}2, a new sublimable spin-crossover molecule

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