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Photomagnetism of a sym-cis-dithiocyanato iron(II) complex with a tetradentate N,N'-bis(2-pyridylmethyl)1,2-ethanediamine ligand

Létard, J.-F., Asthana, S., Shepherd, H.J., Guionneau, P., Goeta, A.E., Suemura, N., Ishikawa, R., Kaizaki, S. (2012) Photomagnetism of a sym-cis-dithiocyanato iron(II) complex with a tetradentate N,N'-bis(2-pyridylmethyl)1,2-ethanediamine ligand. Chemistry - A European Journal, 18 (19). pp. 5924-5934. ISSN 09476539 (ISSN). E-ISSN 1521-3765. (doi:10.1002/chem.201102637) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
https://doi.org/10.1002/chem.201102637

Abstract

A comprehensive study of the magnetic and photomagnetic behaviors of cis-[Fe(picen)(NCS) 2] (picen=N,N'-bis(2-pyridylmethyl)1,2- ethanediamine) was carried out. The spin-equilibration was extremely slow in the vicinity of the thermal spin-transition. When the cooling speed was slower than 0.1 K min -1, this complex was characterized by an abrupt thermal spin-transition at about 70 K. Measurement of the kinetics in the range 60-70 K was performed to approach the quasi-static hysteresis loop. At low temperatures, the metastable HS state was quenched by a rapid freezing process and the critical T(TIESST) temperature, which was associated with the thermally induced excited spin-state-trapping (TIESST) effect, was measured. At 10 K, this complex also exhibited the well-known light-induced excited spin-state-trapping (LIESST) effect and the T(LIESST) temperature was determined. The kinetics of the metastable HS states, which were generated from the freezing effect and from the light-induced excitation, was studied. Single-crystal X-ray diffraction as a function of speed-cooling and light conditions at 30 K revealed the mechanism of the spin-crossover in this complex as well as some direct relationships between its structural properties and its spin state. This spin-crossover (SCO) material represents a fascinating example in which the metastability of the HS state is in close vicinity to the thermal spin-transition region. Moreover, it is a beautiful example of a complex in which the metastable HS states can be generated, and then compared, either by the freezing effect or by the LIESST effect. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Item Type: Article
DOI/Identification number: 10.1002/chem.201102637
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Chem. Eur. J. [Field not mapped to EPrints] AD - CNRS, Université Bordeaux, ICMCB, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France [Field not mapped to EPrints] AD - Department of Chemsitry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 540-0043, Japan [Field not mapped to EPrints] AD - Crystallography Group, Durham University, Durham DH1 3LE, United Kingdom [Field not mapped to EPrints] AD - Department of Physics, Indian Institute of Technology, Hyderabad, India [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: iron, ligand effects, photomagnetism, spin crossover, X-ray diffraction, Comprehensive studies, Cooling speed, Freezing effect, Iron complex, Ligand effect, Light conditions, Low temperatures, Metastabilities, Photomagnetism, Quasi-static hysteresis loop, Rapid freezing, Single crystal x-ray diffraction, Spin crossovers, Spin state, Tetradentate, Thermally induced, Freezing, Iron, Iron compounds, Ligands, Magnetic materials, X ray diffraction, Excited states
Subjects: Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 22 Oct 2015 08:14 UTC
Last Modified: 23 Jan 2020 04:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50826 (The current URI for this page, for reference purposes)
Shepherd, H.J.: https://orcid.org/0000-0003-0832-4475
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