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The Influence of NCE (E = S, Se, BH3) Ligands on the Temperature of Spin Crossover in a Family of Iron(II) Mononuclear Complexes

Abstract

A precise regulation of the temperature of spin crossover (SCO) is an essential task to envisage practical applications of switchable materials. Here we present three isostructual complexes with formula [Fe(LCl)(NCE)2], where LCl is the tetradentate ligand N,N’-bis[(4-chloro-2-pyridyl)methyl]ethane-1,2-diamine and E = S (1-S), Se (1-Se), BH3 (1-BH3). Single-crystal X-ray diffraction, magnetic measurements, Mössbauer spectroscopy and DSC measurements have been carried out to study their SCO properties. 1-S remains in a high spin state over all temperatures due to the weak ligand field strength imposed by NCS ligands. Replacement of NCS by NCSe allows the occurrence of SCO around 177 K. Using NCBH3 instead allows a further increase of the conversion temperature (T1/2) by c.a. 30 K. A literature survey of complexes containing NCE ligands were carried out to examine their influence on the SCO properties. A 50 − 90 K difference in T1/2 was found between NCS and NCSe derivatives and a 30 − 50 difference was found between NCSe and NCBH3 derivatives.

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Publication details

The article was received on 03 Apr 2018, accepted on 09 May 2018 and first published on 10 May 2018


Article type: Research Article
DOI: 10.1039/C8QI00303C
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    The Influence of NCE (E = S, Se, BH3) Ligands on the Temperature of Spin Crossover in a Family of Iron(II) Mononuclear Complexes

    B. Fei, X. Chen, Y. D. Cai, J. Fang, M. Tong, J. Tucek and X. Bao, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00303C

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