Impact of counter anions on structural and magnetic properties of iron(III) meso-tetraphenylporphyrin tetrahydrofurane solvates

Knaflič, Tilen (author), Žnidarič, Mateja (author), Perdih, Franc (author), Trampuž, Marko (author), Jagličić, Zvonko (author), Časar, Zdenko (author), Arčon, Denis (author)

Intensively researched iron meso-tetraphenylporphyrin (FeTPP) complexes are central to the functionalities of many biological systems while at the same time they possess intriguing magnetic properties. Here we report on the synthesis and structural characterization of FeTPP complexes with axial tetrahydrofuran (THF) ligand and different non-coordinating counter anions. Structurally, the most interesting feature of these complexes is the stretching of the distance between the iron(III) and the oxygen atom of the THF ligand for different counter anions. This parameter affects the magnetic anisotropy of FeTPP as studied here with magnetic susceptibility, χ$_m$, and X-band electron paramagnetic resonance (EPR). Both magnetic probes are consistent with the iron(III) in its high-field state S = 5/2. Simulations of temperature dependencies of χ$_m$ and EPR spectra show that the zero-field splitting magnetic anisotropy parameter D decreases with the tetragonal elongation of the hexa-coordinated iron(III) geometry, which is qualitatively discussed within the ligand field theory.

• Language: English
• Keywords: magnetic materials, X-ray diffraction, electron paramagnetic resonance, EPR, magnetic properties
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology; FGG - Faculty of Civil and Geodetic Engineering; FFA - Faculty of Pharmacy; FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 10 str.
• Numbering: Vol. 181, art. 111514
• PID: 20.500.12556/RUL-153051
• UDC: 538.9
• ISSN on article: 0022-3697
• DOI: 10.1016/j.jpcs.2023.111514
• COBISS.SI-ID: 156769539
• Publication date in RUL: 15.12.2023

Record is a part of a journal

• Title: The journal of physics and chemistry of solids
• Shortened title: J. phys. chem. solids
• Publisher: Elsevier
• ISSN: 0022-3697
• COBISS.SI-ID: 25778944

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• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
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