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Synthesis, crystal structures and magnetic properties of composites incorporating an Fe(II) spin crossover complex and polyoxometalates

Kuramochi, Satoshi; Shiga, Takuya; Cameron, Jamie M.; Newton, Graham N.; Oshio, Hiroki

Authors

Satoshi Kuramochi

Takuya Shiga

Jamie M. Cameron

Hiroki Oshio



Abstract

[Fe(dppOH)2]2+ (dppOH = 2,6-di(pyrazol-1-yl)-4-(hydroxymethyl)pyridine) is known to show spin crossover (SCO) behavior and light-induced excited spin state transitions (LIESST). Here, we show that the SCO properties of the [Fe(dppOH)2]2+ complex can be altered by a crystal engineering approach employing counter anion exchange with polyoxometalate (POM) anions. Using this strategy, two new composite materials: (TBA)[Fe(dppOH)2][PMo12O40] (1) and [Fe(dppOH)2]3[PMo12O40]2 (2) (TBA = tetra-n-butylammonium) have been isolated and studied by single crystal X-ray diffraction and magnetic susceptibility measurements. 1 is found to be in a high spin state at 300 K and shows no spin crossover behavior due to a dense packing structure induced by hydrogen bonding between the hydroxyl group of the dppOH ligands and the POM anions. Conversely, 2 contains two crystallographically unique Fe centers, where one is in the low spin state whilst the other is locked in a high spin state in a manner analogous to 1. As a result, 2 is found to show partial spin crossover behavior around 230 K with a decrease in the χmT value of 1.9 emu·mol−1·K. This simple approach could therefore provide a useful method to aid in the design of next generation spin crossover materials.

Journal Article Type Article
Publication Date Jul 22, 2017
Journal Inorganics
Electronic ISSN 2304-6740
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 5
Issue 3
Article Number 48
APA6 Citation Kuramochi, S., Shiga, T., Cameron, J. M., Newton, G. N., & Oshio, H. (2017). Synthesis, crystal structures and magnetic properties of composites incorporating an Fe(II) spin crossover complex and polyoxometalates. Inorganics, 5(3), https://doi.org/10.3390/inorganics5030048
DOI https://doi.org/10.3390/inorganics5030048
Keywords Spin crossover; Polyoxometalate; Crystal engineering; Magnetic properties; Iron
Publisher URL http://www.mdpi.com/2304-6740/5/3/48
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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