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Influence of Hydrogen Bonding on the Hysteresis Width in Iron(II) Spin-Crossover Complexes

Title data

Weber, Birgit ; Bauer, Wolfgang ; Pfaffeneder, Toni ; Dîrtu, Marinela M. ; Naik, Anil D. ; Rotaru, Aurelian ; Garcia, Yann:
Influence of Hydrogen Bonding on the Hysteresis Width in Iron(II) Spin-Crossover Complexes.
In: European Journal of Inorganic Chemistry. Vol. 2011 (2011) Issue 21 . - pp. 3193-3206.
ISSN 1099-0682
DOI: https://doi.org/10.1002/ejic.201100394

Abstract in another language

A detailed investigation on the properties of the high-temperature and low-temperature modifications of the iron(II) spin-crossover complex [FeL1(HIm)2] (1) and its isotopic deuterium-labelled analogue [FeL1(DIm)2] (1D), and the pair [FeL2(azpy)]·MeOH/[FeL2(azpy)]·CD3OD/[FeL2(azpy)] (2·MeOH/2·CD3OD/2), in which L1 and L2 are tetradentate N2O22–-coordinating Schiff base like ligands, L1 = {diethyl(E,E)-2,2′-[1,2-phenylbis(iminomethylidyne)]bis[3-oxobutanoate](2–)-N,N′,O3,O3′}, L2 = {2,2′-[1,2-phenylbis(iminomethylidyne)]bis[1-phenylbutane-1,3-dione](2–)-N,N′,O3,O3′},HIm = imidazole, and azpy = 4,4′-azopyridine, is presented. All complexes except 2 show a cooperative spin transition with hysteresis widths between approximately 5 K (1LT and 1LTD), 70 K (1HT[9] and 1HTD, around room temperature), and 80 K (2·MeOH and 2·CD3OD). In all cases, an influence of the H/D exchange on the transition temperature and the hysteresis width is observed. For 1HT, first-order reversal curves (FORCs) have been recorded, and a statistical analysis gives the interaction parameter J = 560 K, indicating strong intermolecular interactions. X-ray structural analysis of the different samples (1HT[9] and 1HTD: HS; 1LT and 1LTD: LS; and 2·MeOH and 2·CD3OD: HS) gives a deeper insight into the molecular packing in the crystals and helps explain the increase of cooperative interactions during the spin transition. In all cases, one hydrogen bond involves an oxygen atom of the Schiff base like ligand that serves as a donor for the iron centre. The influence of this hydrogen bond on the ligand field strength of the iron centre is discussed and a new model is developed to explain the observed connection between hydrogen bonds and exceptionally wide hysteresis loops for the complexes presented in this work and other examples from the literature.

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: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 27 Jul 2017 12:09
Last Modified: 27 Jul 2017 12:09
URI: https://eref.uni-bayreuth.de/id/eprint/38836