Modification of the Spin Transition Properties in Hetero-Anionic Iron(II)-Triazole Complexes

authored by: Maximilian Seydi Kilic, Isabel Mae Merchant, Erika Elliott, Justus Pawlak, Jules Brehme, Arthur Sander, Taisei Suzuki, Takuya Shiga, Masayuki Nihei, Franz Renz
Abstract: The phenomenon which is called spin crossover is known to occur in some coordination compounds with an octahedral ligand field and electron configurations from 3d⁴ to 3d⁷. Thereby, a reversible transition between spin states (high spin and low spin state) is possible, through several external stimuli. Iron(II) triazole complexes exhibit this phenomenon at a wide range of temperatures depending on the ligands and anions used. For this reason, they are often considered for several possible practical applications. It is also possible to combine ligands or anions to modify the transition temperature. The latter of which was rarely discussed in the past. In this study we synthesized a series of iron(II)-4-Aminotriazole complexes, with different ratios of chloride- and tetrafluoroborate-anions, of the formula [Fe(Atrz)₃]Cl_2−X(BF₄)_X. We show that the combination of these anions leads to transition temperatures between those of their corresponding pure anion complexes. We furthermore present that a simple modification of the synthesis leads to a possible easy way of fine-tuning transitions temperatures.
Organisation(s): Inorganic Coordination and Materials Chemistry group
Institute of Inorganic Chemistry
Hannover School for Nanotechnology
Laboratory of Nano and Quantum Engineering
External Organisation(s): University of Tsukuba
Type: Article
Journal: European Journal of Inorganic Chemistry
No. of pages: 10
ISSN: 1434-1948
Publication date: 30.10.2024
Publication status: E-pub ahead of print
Peer reviewed: Yes
ASJC Scopus subject areas: Inorganic Chemistry
Electronic version(s): https://doi.org/10.1002/ejic.202400474 (Access: Open)

BibTeX

@article{3defc96229d546e79ebd03d1fcafc3fe,
title = "Modification of the Spin Transition Properties in Hetero-Anionic Iron(II)-Triazole Complexes",
abstract = "The phenomenon which is called spin crossover is known to occur in some coordination compounds with an octahedral ligand field and electron configurations from 3d4 to 3d7. Thereby, a reversible transition between spin states (high spin and low spin state) is possible, through several external stimuli. Iron(II) triazole complexes exhibit this phenomenon at a wide range of temperatures depending on the ligands and anions used. For this reason, they are often considered for several possible practical applications. It is also possible to combine ligands or anions to modify the transition temperature. The latter of which was rarely discussed in the past. In this study we synthesized a series of iron(II)-4-Aminotriazole complexes, with different ratios of chloride- and tetrafluoroborate-anions, of the formula [Fe(Atrz)3]Cl2−X(BF4)X. We show that the combination of these anions leads to transition temperatures between those of their corresponding pure anion complexes. We furthermore present that a simple modification of the synthesis leads to a possible easy way of fine-tuning transitions temperatures.",
keywords = "Modification of properties, Molecular switches, Spin crossover, Spin transition, Triazole Complexes",
author = "Kilic, {Maximilian Seydi} and Merchant, {Isabel Mae} and Erika Elliott and Justus Pawlak and Jules Brehme and Arthur Sander and Taisei Suzuki and Takuya Shiga and Masayuki Nihei and Franz Renz",
note = "Publisher Copyright: {\textcopyright} 2024 The Author(s). European Journal of Inorganic Chemistry published by Wiley-VCH GmbH.",
year = "2024",
month = oct,
day = "30",
doi = "10.1002/ejic.202400474",
language = "English",
journal = "European Journal of Inorganic Chemistry",
issn = "1434-1948",
publisher = "Wiley-VCH Verlag",
}