Three-Way Switchable Single-Crystal-to-Single-Crystal Solvatomorphic Spin Crossover in a Molecular Cocrystal

The Fe­(III) spin-switching complexes [Fe­(qsal-5-Y)2]­X (where Y = F, Cl, Br, I or OMe; X = NCS–, Cl–, OTf–, NO3 –, BF4 –, PF6 –, or BPh4 –) display a variety of thermal spin transition profiles, including abrupt, stepped, and hysteretic, with potential applications as temperature- or gas-dependent...

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Published in:Chemistry of materials 2020-12, Vol.32 (23), p.10076-10083
Main Authors: Zuluaga, Andrés Reyes, Brock, Aidan J, Pfrunder, Michael C, Phonsri, Wasinee, Murray, Keith S, Harding, Phimphaka, Micallef, Aaron S, Mullen, Kathleen M, Clegg, Jack K, Harding, David J, McMurtrie, John C
Format: Article
Language:English
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Summary:The Fe­(III) spin-switching complexes [Fe­(qsal-5-Y)2]­X (where Y = F, Cl, Br, I or OMe; X = NCS–, Cl–, OTf–, NO3 –, BF4 –, PF6 –, or BPh4 –) display a variety of thermal spin transition profiles, including abrupt, stepped, and hysteretic, with potential applications as temperature- or gas-dependent switches or memory/storage devices. Here, the complex [Fe­(qsal-OMe)2]­NCS is encased within discrete anionic supramolecular motifs in cocrystalline [Fe­(qsal-OMe)2]­[(1,3,5-triiodotrifluorobenzene)­(NCS)]·MeOH/H2O (1·IFB·solvent). The MeOH and H2O solvate within these robust crystals can be reversibly exchanged, giving an artificial triple hysteresis, with six different stable magnetic states and a ΔT 1/2 of 95 K (MeOH versus H2O solvatomorphs), which represent the workings of a stimulated logic gate that can be reset with heat or vacuum. Variable-temperature single-crystal X-ray diffraction (VT-SCXRD) elucidated the entire spin transition profile of the parent complex [Fe­(qsal-OMe)2]­(NCS)·MeCN (1·MeCN) and the anionic supramolecular framework-like adducts [Fe­(qsal-OMe)2]­[(1,3,5-triiodotrifluorobenzene)­(NCS)] (1·IFB), [Fe­(qsal-OMe)2]­[(1,3,5-triiodotrifluorobenzene)­(NCS)]·MeOH (1·IFB·MeOH) and [Fe­(qsal-OMe)2]­[(1,3,5-triiodotrifluorobenzene)­(NCS)]·H2O (1·IFB·H 2 O), with full structures collected every 5 or 10 K (total of 202 individual structures) over a temperature range of 100–450 K. The reversible solvent exchange and magnetic changes suggest that crystalline 1·IFB may be used as a specialized molecular magnetic sensor for MeOH and H2O.
ISSN:0897-4756
1520-5002
DOI:10.1021/acs.chemmater.0c03396