Investigation of the High-Temperature Spin-Transition of a Mononuclear Iron(II) Complex Using X-ray Photoelectron Spectroscopy

Alexander R Craze; Kyle J Howard-Smith; Mohan M Bhadbhade; Outi Mustonen; Cameron J Kepert; Christopher E Marjo; Feng Li

doi:10.1021/acs.inorgchem.8b00576

Investigation of the High-Temperature Spin-Transition of a Mononuclear Iron(II) Complex Using X-ray Photoelectron Spectroscopy

Inorg Chem. 2018 Jun 4;57(11):6503-6510. doi: 10.1021/acs.inorgchem.8b00576. Epub 2018 May 18.

Authors

Alexander R Craze¹, Kyle J Howard-Smith¹, Mohan M Bhadbhade², Outi Mustonen², Cameron J Kepert³, Christopher E Marjo², Feng Li¹

Affiliations

¹ School of Science and Health, Western Sydney University , Locked Bag 1797, Penrith , New South Wales 2751 , Australia.
² Mark Wainwright Analytical Centre , University of New South Wales , Sydney , New South Wales 2052 , Australia.
³ School of Chemistry , University of Sydney , Sydney , New South Wales 2006 , Australia.

PMID: 29775054
DOI: 10.1021/acs.inorgchem.8b00576

Abstract

This study presents a new mononuclear complex (1) of the form [FeL](BF₄)₂, incorporating the thiazolylimine donor moiety, which was found to exhibit a high-temperature spin-transition. The effect of scan rate was investigated, with magnetic susceptibility being measured at 4, 2, and 1 K min^-1. The magnetic susceptibility results were confirmed by variable temperature X-ray photoelectron spectroscopy (XPS) (100, 270, 400, and 500 K) and single crystal X-ray diffraction (150 and 400 K) experiments. A rare example of a high-temperature (400 K) single crystal structure of 1 has been reported. The high-spin fraction was calculated indirectly from XPS data, presenting a method for analyzing the spin-state in the surface layers of spin-crossover materials.