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Open AccessArticle

Abrupt Spin Crossover Behavior in a Linear N1,N2-Triazole Bridged Trinuclear Fe(II) Complex

1
Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
2
Graduate School Materials Science in Mainz, Staudingerweg 9, D-55128 Mainz, Germany
3
Fachbereich Physik, Technische Universität Kaiserslautern, Erwin-Schrödinger-Street 46, 67663 Kaiserslautern, Germany
*
Author to whom correspondence should be addressed.
Magnetochemistry 2018, 4(3), 34; https://doi.org/10.3390/magnetochemistry4030034
Received: 28 June 2018 / Revised: 31 July 2018 / Accepted: 1 August 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Spin-Crossover Beyond the Immediate Tribute)
The synthesis, structures and magnetic properties of a new trinuclear spin crossover complex [FeII3(pyrtrz)6(TsO)6]·10H2O·2CH3OH (C2) and its analogue binuclear [FeII2(pyrtrz)5(SCN)4]·7H2O (C1), are reported here. These two compounds are synthesized based on the pyrrolyl functionalized Schiff base 1,2,4-triazole ligand 4-((1H-pyrrol-2-yl)methylene-amino)-4H-1,2,4-triazole (pyrtrz), which represent rare discrete multi-nuclear species, with µ2-N1,N2-triazole bridges linking the FeII centers. DC magnetic susceptibility measurements revealed an abrupt single-step spin crossover (SCO) behavior for compound 2 on the central FeII site and single-crystal X-ray diffraction (173 K) showed that this compound crystallizes in the monoclinic space group (P21/c), and multiple intramolecular interactions were found responsible for the abrupt transition. Compound 1 is a binuclear complex with thiocyanate as terminal ligands. This compound stays in high spin state over the whole temperature range and displays weak antiferromagnetic exchange coupling. View Full-Text
Keywords: spin crossover; iron(II); trinuclear; binuclear; 1,2,4-triazole; Schiff bases spin crossover; iron(II); trinuclear; binuclear; 1,2,4-triazole; Schiff bases
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Li, A.-M.; Hochdörffer, T.; Wolny, J.A.; Schünemann, V.; Rentschler, E. Abrupt Spin Crossover Behavior in a Linear N1,N2-Triazole Bridged Trinuclear Fe(II) Complex. Magnetochemistry 2018, 4, 34.

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