Linear Chains of Magnetic Ions Stacked with Variable Distance: Ferromagnetic Ordering with a Curie Temperature above 20 K. Issue 41 (7th September 2016)

• Record Type: Journal Article
• Authors: Friedländer, Stefan; Liu, Jinxuan; Addicoat, Matt; Petkov, Petko; Vankova, Nina; Rüger, Robert; Kuc, Agnieszka; Guo, Wei; Zhou, Wencai; Lukose, Binit; Wang, Zhengbang; Weidler, Peter G.; Pöppl, Andreas; Ziese, Michael; Heine, Thomas; Wöll, Christof
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 41(2016)
• Page Start: 12683
• Page End: 12687
• Publication Date: 2016-09-07
• Subjects: ab initio calculations -- EPR spectroscopy -- magnetic properties -- metal–organic frameworks; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201606016
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: We have studied the magnetic properties of the SURMOF‐2 series of metal–organic frameworks (MOFs). Contrary to bulk MOF‐2 crystals, where Cu 2+ ions form paddlewheels and are antiferromagnetically coupled, in this case the Cu 2+ ions are connected via carboxylate groups in a zipper‐like fashion. This unusual coupling of the spin 1 / 2 ions within the resulting one‐dimensional chains is found to stabilize a low‐temperature, ferromagnetic (FM) phase. In contrast to other ordered 1D systems, no strong magnetic fields are needed to induce the ferromagnetism. The magnetic coupling constants describing the interaction between the individual metal ions have been determined in SQUID experiments. They are fully consistent with the results of ab initio DFT electronic structure calculations. The theoretical results allow the unusual magnetic behavior of this exotic, yet easy‐to‐fabricate, material to be described in a detailed fashion. Abstract : MOF magnetism : In the metal–organic frameworks (MOFs) of the SURMOF‐2 series the carboxylate groups have a zip‐fastener arrangement. The coupling between the spin 1 /2 ions in the 1D chain stabilizes a ferromagnetic (FM) phase at low temperature. Inducing the ferromagnetism does not require a strong magnetic field. The magnetic coupling constants describing the interaction between the metal ions were determined.