Broad spin crossover in an iron(III) Schiff base complex with a cis-FeN4O2 coordination environment

Dawit Tesfaye; Mamo Gebrezgiabher; Jonas Braun; Juraj Kuchár; Juraj Černák; Atakilt Abebe; Pascal Boulet; Nandakumar Kalarikkal; Tim Hochdörffer; Volker Schünemann; Christopher E. Anson; Madhu Thomas; Annie K. Powell

doi:10.1039/D5NJ02493E

Broad spin crossover in an iron(iii) Schiff base complex with a cis-FeN₄O₂ coordination environment†

Dawit Tesfaye,

^abcd Mamo Gebrezgiabher,

^ab Jonas Braun,

^e Juraj Kuchár,

^d Juraj Černák,

^d Atakilt Abebe,

^f Pascal Boulet,

^g Nandakumar Kalarikkal,

^h Tim Hochdörffer,ⁱ Volker Schünemann,

ⁱ Christopher E. Anson,

^e Madhu Thomas

*^ab and Annie K. Powell

*^e

Author affiliations

* Corresponding authors

^a Department of Industrial Chemistry, College of Natural and Applied Sciences, Addis Ababa Science and Technology University, Addis Ababa P.O. Box 16417, Ethiopia
E-mail: madhu.thomas@aastu.edu.et

^b Nanotechnology Center of Excellence, Addis Ababa Science and Technology University, Addis Ababa P.O. Box 16417, Ethiopia

^c Department of Chemistry, College of Natural Sciences, Salale University, Fitche P.O.Box 245, Ethiopia

^d Department of Inorganic Chemistry, Institute of Chemistry, P. J. Šafárik University in Košice, Moyzesova 11, 041 54 Košice, Slovakia

^e Institute of Inorganic Chemistry (AOC), Institute of Nanotechnology (INT) and Institute for Quantum Materials and Technologies (IQMT) Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
E-mail: annie.powell@kit.edu

^f Department of Chemistry, College of Science, Bahir Dar University, P.O.Box 79, Bahir Dar, Ethiopia

^g Institute Jean Lamour (IJL), UMR 7198, CNRS-Université de Lorraine, F-54011 Nancy, France

^h School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, Kerala, India

ⁱ Department of Physics, University of Kaiserlautern-Landau, Erwin-Schrödinger-Strasse 46, 67663 Kaiserlautern, Germany

Abstract

Asymmetrical condensation of ethylenediamine with 5-bromo-2-hydroxybenzaldehyde yielded a Schiff base, (E)-2-(((2-aminoethyl)imino)methyl)-4-bromophenol (5-Brsaen), and the reaction with Fe(NO₃)₃·9H₂O generated the complex [Fe(5-Brsaen)₂]NO₃·CH₃OH (1). The complex was characterised by single crystal XRD measurements, elemental analysis, FT-IR spectra, DC magnetic susceptibility measurements and variable temperature Mössbauer spectroscopy. The single crystal XRD studies of 1 at 293 K and 173 K reveal that the Fe–N and Fe–O bond lengths are intermediate between what would be expected for HS and LS Fe(III). The hydrogen bonds result in a 2D supramolecular structure. DC magnetic measurements between 300 and 2 K reveal that the compound does not reach a pure HS state even at RT. Furthermore, the proportion of HS to LS decreases as the temperature decreases and reaches a LS state at 2 K. Variable temperature Mössbauer spectra are in line with this conclusion.

New Journal of Chemistry

Broad spin crossover in an iron(iii) Schiff base complex with a cis-FeN₄O₂ coordination environment†

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Broad spin crossover in an iron(III) Schiff base complex with a cis-FeN₄O₂ coordination environment

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