Fine-Tuned Magnetic and Electrochemical Properties of a Series of Fe(II) Complexes with Asymmetric Jäger-Type (N₂O₂)²⁻ Ligands

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00009073
URN to cite this document: urn:nbn:de:bvb:703-epub-9073-0

Title data

Schreck, Constantin ; Heinemann, Frank W. ; Köhler, Phil ; Hörner, Gerald ; Weber, Birgit:
Fine-Tuned Magnetic and Electrochemical Properties of a Series of Fe(II) Complexes with Asymmetric Jäger-Type (N₂O₂)²⁻ Ligands.
In: Zeitschrift für anorganische und allgemeine Chemie. Vol. 652 (2026) Issue 1 . - e202500198.
ISSN 1521-3749
DOI der Verlagsversion: https://doi.org/10.1002/zaac.202500198

	Format: PDF Name: Zeitschrift anorg allge chemie - 2025 - Schreck - Fine‐Tuned Magnetic and Electrochemical Properties of a Series of Fe II .pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
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Project information

Project title:	Project's official title Project's id Komplexe mit schaltbarer Lumineszenz: Korrelation zwischen Spinzustand, Packung und Emissionseigenschaften 463161096 Erleuchtung offenschaliger 3d-Metallkomplexe durch komprimierte Ligandenfelder 509879467 Open Access Publizieren No information
Project financing:	Deutsche Forschungsgemeinschaft

Abstract

A series of seven new asymmetrically substituted Jäger-type (N2O2)2− ligands and their iron(II) complexes is reported, designed to probe how mixed substitution influences molecular and material properties. Comprehensive characterization—including magnetic measurements, X-ray diffraction, spectroscopy, electrochemistry, and density functional theory (DFT) calculations—shows that many optical and redox properties of the asymmetric ligands and complexes follow additive trends from their symmetric counterparts. Cyclic voltammetry reveals predictable fine-tuning of the Fe3+/2+ redox potential, while DFT calculations confirm the decisive role of carbonyl coordination: ketone donors enable spin-crossover (SCO), whereas ester donors stabilize the high-spin state. However, the SCO behavior of the bulk iron(II) materials often deviates; in some cases, SCO is suppressed, while in others, entirely new transition profiles appear. These findings highlight the decisive role of molecular symmetry and intermolecular packing in governing cooperativity in SCO materials.

Further data

Item Type:	Article in a journal
Keywords:	asymmetric ligands; density functional theory; mixed substitution; Schiff base; spin-crossover
DDC Subjects:	500 Science > 540 Chemistry
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry II Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Inorganic Chemistry IV - Univ.-Prof. Dr. Birgit Weber Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-9073-0
Date Deposited:	02 Apr 2026 13:05
Last Modified:	02 Apr 2026 13:06
URI:	https://epub.uni-bayreuth.de/id/eprint/9073

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