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Open AccessArticle

Anion Influence on Spin State in Two Novel Fe(III) Compounds: [Fe(5F-sal2333)]X

1
Centre for Synthesis and Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin (UCD), Belfield, Dublin 4, Ireland
2
Institute for Inorganic Chemistry (AOC), KIT (Karlsruhe Institute of Technology), Engessterstr. 15, 76131 Karlsruhe, Germany
3
Institute for Nanotechnology (INT), KIT (Karlsruhe Institute of Technology), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(1), 19; https://doi.org/10.3390/cryst9010019
Received: 12 December 2018 / Revised: 21 December 2018 / Accepted: 22 December 2018 / Published: 29 December 2018
(This article belongs to the Special Issue Synthesis and Applications of New Spin Crossover Compounds)
Structural and magnetic data on two iron (III) complexes with a hexadentate Schiff base chelating ligand and Cl or BPh4 counterions are reported. In the solid state, the Cl complex [Fe(5F-sal2333)]Cl, 1, is high spin between 5–300 K while the BPh4 analogue [Fe(5F-sal2333)]BPh4, 2, is low spin between 5–250 K, with onset of a gradual and incomplete spin crossover on warming to room temperature. Structural investigation reveals different orientations of the hydrogen atoms on the secondary amine donors in the two salts of the [Fe(5F-sal2333)]+ cation: high spin complex [Fe(5F-sal2333)]Cl, 1, crystallizes with non-meso orientations while the spin crossover complex [Fe(5F-sal2333)]BPh4, 2, crystallizes with a combination of meso and non-meso orientations disordered over one crystallographic site. Variable temperature electronic absorption spectroscopy of methanolic solutions of 1 and 2 suggests that both are capable of spin state switching in the solution. View Full-Text
Keywords: Fe(III) coordination complexes; hexadentate ligand; Schiff base; spin crossover; UV-Vis spectroscopy; SQUID; EPR spectroscopy Fe(III) coordination complexes; hexadentate ligand; Schiff base; spin crossover; UV-Vis spectroscopy; SQUID; EPR spectroscopy
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MDPI and ACS Style

Sundaresan, S.; Kühne, I.A.; Kelly, C.T.; Barker, A.; Salley, D.; Müller-Bunz, H.; Powell, A.K.; Morgan, G.G. Anion Influence on Spin State in Two Novel Fe(III) Compounds: [Fe(5F-sal2333)]X. Crystals 2019, 9, 19.

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