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Effects of Internal and External Pressure on the [Fe(PM-PEA)2(NCS)2] Spin-Crossover Compound (with PM-PEA = N-(2′-pyridylmethylene)-4-(phenylethynyl)aniline)

1
CNRS, Univ. Bordeaux, ICMCB, UPR9048, 87 Avenue du Dr. Schweitzer, F-33600 Pessac, France
2
Department of Chemistry, University Science Laboratories, South Road, Durham—DH1 3LE, UK
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Authors to whom correspondence should be addressed.
Academic Editors: Guillem Aromí and José Antonio Real
Magnetochemistry 2016, 2(1), 15; https://doi.org/10.3390/magnetochemistry2010015
Received: 15 January 2016 / Revised: 26 February 2016 / Accepted: 29 February 2016 / Published: 4 March 2016
(This article belongs to the Special Issue Spin Crossover (SCO) Research)
The spin-crossover properties of the strongly cooperative compound [Fe(PM-PEA)2(NCS)2] (with PM-PEA = N-(2′-pyridylmethylene)-4-(phenylethynyl)aniline) have been investigated under external in situ pressure, external ex situ pressure and internal pressure. In situ single-crystal X-ray diffraction investigations under pressure indicate a Spin-Crossover (SCO) at about 400 MPa and room temperature. Interestingly, application of ex situ pressure induces the irreversible enlargement of the hysteresis width, almost independently from the pressure value. Elsewhere, the internal pressure effects are examined through the magnetic and photomagnetic investigations on powders of the solid-solutions based on the Mn ion, [FexMn1−x(PM-PEA)2(NCS)2]. Growing the Mn ratio increases the internal pressure, allowing to control the hysteresis width and the paramagnetic residue but also to enhance the efficiency of the photo-induced SCO. The comparison of the quenching and light-induced behaviors reveals a complex phase-diagram governed by internal pressure, temperature and light. View Full-Text
Keywords: spin crossover (SCO); pressure; metal-coordination chemistry; light-induced SCO; crystallography; metastable state; iron; solid solution spin crossover (SCO); pressure; metal-coordination chemistry; light-induced SCO; crystallography; metastable state; iron; solid solution
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Paradis, N.; Le Gac, F.; Guionneau, P.; Largeteau, A.; Yufit, D.S.; Rosa, P.; Létard, J.-F.; Chastanet, G. Effects of Internal and External Pressure on the [Fe(PM-PEA)2(NCS)2] Spin-Crossover Compound (with PM-PEA = N-(2′-pyridylmethylene)-4-(phenylethynyl)aniline). Magnetochemistry 2016, 2, 15.

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