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Slow Self-Assembly Favors Hysteresis above Room Temperature for an Iron(II) 1D-Chain Spin-Crossover Complex

Title data

Nowak, René ; Bauer, Wolfgang ; Ossiander, Tanja ; Weber, Birgit:
Slow Self-Assembly Favors Hysteresis above Room Temperature for an Iron(II) 1D-Chain Spin-Crossover Complex.
In: European Journal of Inorganic Chemistry. Vol. 2013 (2013) Issue 5-6 . - pp. 975-983.
ISSN 1099-0682
DOI: https://doi.org/10.1002/ejic.201201051

Abstract in another language

The X-ray structures and magnetic properties of three new iron(II) coordination polymers with the general formula [FeL1(Lax)]n are presented. L1 is the tetradentate N2O22– Schiff-base-like ligand (E,E)-{dimethyl-2,2′-[1,2-phenylenebis(iminomethylidyne)]bis(3-oxobutanato)(2–)-N,N′,O3,O3′}. For the axial coordination, 4,4′-bipyridine (bipy), 1,2-bis(4-pyridyl)ethane (bpea), and 1,2-bis(4-pyridyl)ethene (bpee) were used. Spin-transition behavior was observed for the bpea and the bipy complexes. In both cases, two different polymorphs were isolated, showing different magnetic properties. In the case of the bipy complex 1, different preparation methods were tested to elucidate which conditions favor one polymorph over another. It appears that a slow precipitation of the coordination polymer favors a cooperative spin transition above room temperature, whereas a fast precipitation results in a gradual spin transition at lower temperatures. In the case of the bpea complex, an incomplete spin transition is observed, which can be explained by the crystal packing.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry IV > Chair Anorganic 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 > Chair Anorganic Chemistry IV
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 26 Jul 2017 10:55
Last Modified: 26 Jul 2017 10:55
URI: https://eref.uni-bayreuth.de/id/eprint/38818