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

Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
Graduate School Materials Science in Mainz, Staudingerweg 9, D-55128 Mainz, Germany
Fachbereich Physik, Technische Universität Kaiserslautern, Erwin-Schrödinger-Street 46, 67663 Kaiserslautern, Germany
Author to whom correspondence should be addressed.
Magnetochemistry 2018, 4(3), 34;
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)
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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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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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