Implications of bond disorder in a S =1 kagome lattice
SCIENTIFIC REPORTS(2018)
摘要
Strong hydrogen bonds such as F···H···F offer new strategies to fabricate molecular architectures exhibiting novel structures and properties. Along these lines and, to potentially realize hydrogen-bond mediated superexchange interactions in a frustrated material, we synthesized [H 2 F] 2 [Ni 3 F 6 (Fpy) 12 ][SbF 6 ] 2 (Fpy = 3-fluoropyridine). It was found that positionally-disordered H 2 F + ions link neutral NiF 2 (Fpy) 4 moieties into a kagome lattice with perfect 3-fold rotational symmetry. Detailed magnetic investigations combined with density-functional theory (DFT) revealed weak antiferromagnetic interactions ( J ~ 0.4 K) and a large positive- D of 8.3 K with m s = 0 lying below m s = ±1. The observed weak magnetic coupling is attributed to bond-disorder of the H 2 F + ions which leads to disrupted Ni-F···H-F-H···F-Ni exchange pathways. Despite this result, we argue that networks such as this may be a way forward in designing tunable materials with varying degrees of frustration.
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关键词
Magnetic materials,Magnetic properties and materials,Science,Humanities and Social Sciences,multidisciplinary
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