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Henrich, Laura; Müller, Peter C; Hempelmann, Jan; Mann, Markus; van Leusen, Jan; Steinberg, Simon; Dronskowski, Richard
Molecules (Basel, Switzerland), 06/2023, Letnik: 28, Številka: 13Journal Article
FeCsub.5Hsub.5Nsub.2N(CN)sub.2sub.2 (1) was synthesized from a reaction of stoichiometric amounts of NaN(CN)sub.2 and FeClsub.2·4Hsub.2O in a methanol/pyridine solution. Single-crystal and powder diffraction show that 1 crystallizes in the monoclinic space group I2/m (no. 12), different from MnCsub.5Hsub.5Nsub.2N(CN)sub.2sub.2 (P2sub.1/c, no. 14) due to tilted pyridine rings, with a = 7.453(7) Å, b = 13.167(13) Å, c = 8.522(6) Å, β = 114.98(6)° and Z = 2. ATR-IR, AAS, and CHN measurements confirm the presence of dicyanamide and pyridine. Thermogravimetric analysis shows that π-stacking interactions of the pyridine rings play an important role in structural stabilization. Based on DFT-optimized structures, a chemical bonding analysis was performed using a local-orbital framework by projection from a plane-wave basis. The resulting bond orders and atomic charges are in good agreement with the expectations based on the structure analysis. SQUID magnetic susceptibility measurements show a high-spin state Fesup.II compound with predominantly antiferromagnetic exchange interactions at lower temperatures.
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