Mononuclear Fe(III) Schiff Base Complex with Trans-FeO4N2 Chromophore of o-Aminophenol Origin: Synthesis, Characterisation, Crystal Structure, and Spin State Investigation

Author:

Tesfaye Dawit1234ORCID,Braun Jonas5ORCID,Gebrezgiabher Mamo12ORCID,Kuchár Juraj4ORCID,Černák Juraj4,Sani Taju12ORCID,Gismelseed Abbasher6ORCID,Hochdörffer Tim7,Schünemann Volker7,Anson Christopher E.5ORCID,Powell Annie K.5ORCID,Thomas Madhu12ORCID

Affiliation:

1. Department of Industrial Chemistry, College of Natural and Applied Sciences, Addis Ababa Science and Technology University, Addis Ababa P.O. Box 16417, Ethiopia

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

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

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

5. 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

6. Department of Physics, College of Science, Sultan Qaboos University, Al-Khod P.O. Box 36, Oman

7. Department of Physiscs, University of Kaiserlautern-Landau, Erwin-Schrödinger-Strasse 46, 67663 Kaiserlautern, Germany

Abstract

A new iron(III) complex (Et3NH)2[Fe(L)2](ClO4)·MeOH (1) where H2L = 2-{(E)-[2-hydroxyphenyl)imino]methyl}phenol has been synthesised and characterised by single crystal XRD, elemental analysis and DC magnetic susceptibility measurements. The dianionic ligands L2− coordinate in a tridentate fashion with the Fe(III) through their deprotonated phenolic oxygens and azomethine nitrogen atoms, resulting in a trans-FeO4N2 chromophore. Variable-temperature magnetic measurements were performed between 300 and 5 K under an applied field of 0.1 T and show that 1 is in the high spin state (S = 5/2) over the whole measured temperature range. This is confirmed by Mössbauer spectroscopy at 77 and 300 K.

Publisher

MDPI AG

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