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Title: 2D Conductive Iron-Quinoid Magnets Ordering up to Tc = 105 K via Heterogenous Redox Chemistry

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b00705· OSTI ID:1388516

We report the magnetism and conductivity for a redox pair of iron-quinoid metal–organic frameworks (MOFs). The oxidized compound, (Me2NH2)2[Fe2L3]·2H2O·6DMF (LH2 = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinone) was previously shown to magnetically order below 80 K in its solvated form, with the ordering temperature decreasing to 26 K upon desolvation. Here, we demonstrate this compound to exhibit electrical conductivity values up to σ = 1.4(7) × 10–2 S/cm (Ea = 0.26(1) cm–1) and 1.0(3) × 10–3 S/cm (Ea = 0.19(1) cm–1) in its solvated and desolvated forms, respectively. Upon soaking in a DMF solution of Cp2Co, the compound undergoes a single-crystal-to-single-crystal one-electron reduction to give (Cp2Co)1.43(Me2NH2)1.57[Fe2L34.9DMF. Structural and spectroscopic analysis confirms this reduction to be ligand-based, and as such the trianionic framework is formulated as [FeIII2(L3–•)3]3–. Magnetic measurements for this reduced compound reveal the presence of dominant intralayer metal–organic radical coupling to give a magnetically ordered phase below Tc = 105 K, one of the highest reported ordering temperatures for a MOF. This high ordering temperature is significantly increased relative to the oxidized compound, and stems from the overall increase in coupling strength afforded by an additional organic radical. In line with the high critical temperature, the new MOF exhibits magnetic hysteresis up to 100 K, as revealed by variable-field measurements. Lastly, this compound is electrically conductive, with values up to σ = 5.1(3) × 10–4 S/cm with Ea = 0.34(1) eV. Taken together, these results demonstrate the unique ability of metal-quinoid MOFs to simultaneously exhibit both high magnetic ordering temperatures and high electrical conductivity.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001088; AC02-06CH11357; NNCI-154220; ECCS-154220; DMR-112126; DMR-135195
OSTI ID:
1388516
Journal Information:
Journal of the American Chemical Society, Vol. 139, Issue 11; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 168 works
Citation information provided by
Web of Science

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