Direct monitoring of spin transitions in a dinuclear triple-stranded helicate iron(II) complex through X-ray photoelectron spectroscopy

Li Li; Alexander R. Craze; Ryohei Akiyoshi; Asami Tsukiashi; Shinya Hayami; Outi Mustonen; Mohan M. Bhadbhade; Saroj Bhattacharyya; Christopher E. Marjo; Yun Wang; Leonard F. Lindoy; Janice R. Aldrich-Wright; Feng Li

doi:10.1039/C7DT04190J

Direct monitoring of spin transitions in a dinuclear triple-stranded helicate iron(ii) complex through X-ray photoelectron spectroscopy†

Li Li,^a Alexander R. Craze,^a Ryohei Akiyoshi,^b Asami Tsukiashi,^b Shinya Hayami,

^b Outi Mustonen,^c Mohan M. Bhadbhade,^c Saroj Bhattacharyya,^c Christopher E. Marjo,

^c Yun Wang,

^d Leonard F. Lindoy,^e Janice R. Aldrich-Wright

^a and Feng Li

*^a

Author affiliations

* Corresponding authors

^a School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
E-mail: feng.li@westernsydney.edu.au

^b Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Japan

^c Mark Wainwright Analytical Centre, University of New South Wales, Kensington, NSW 2052, Australia

^d Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University, Queensland 4222, Australia

^e School of Chemistry, University of Sydney, NSW 2006, Australia

Abstract

A dinuclear helical iron(II) complex of a new ditopic thiazolylimine ligand (L) has been synthesised via supramolecular assembly. The resulting dinuclear helical cylinder [Fe₂L₃]·4BF₄ was investigated by variable temperature X-ray crystallography, ESI high resolution mass spectrometry, CHN analysis, FT-IR and UV-Vis spectroscopy. The nature of the spin transition was investigated by magnetic susceptibility measurements, and confirmed by VT-SCXRD and X-ray photoelectron spectroscopy. [Fe₂L₃]·4BF₄ displays a complete spin transition with a gradual-abrupt character at T_1/2 = 348 K and represents a new example of a dinuclear iron(II) complex exhibiting a spin transition at high temperature. Both VT-SCXRD and XPS measurements show excellent correlation with the magnetic susceptibility experiments, demonstrating the power of XPS not just to confirm, but also to clearly follow the spin-state transition in Fe(II) SCO complexes.

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Direct monitoring of spin transitions in a dinuclear triple-stranded helicate iron(ii) complex through X-ray photoelectron spectroscopy†

Abstract

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Direct monitoring of spin transitions in a dinuclear triple-stranded helicate iron(II) complex through X-ray photoelectron spectroscopy

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