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. 2017 Feb 13;8:14212. doi: 10.1038/ncomms14212

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Copyright © 2017, The Author(s)

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(a) Electron paramagnetic resonance (EPR) spectra and (b) X-ray photoelectron spectroscopy (XPS) of desolvated MFM-300(V^III) and MFM-300(V^IV). The X-band (9.86 GHz) EPR spectra were collected at 293 K. MFM-300(V^III) is EPR silent under these conditions, consistent with V^III. MFM-300(V^IV) has a strong EPR spectrum under the same conditions, giving a single resonance centred at g=1.955 (9.8661 GHz), consistent with V^IV, d¹ (g<g_e, the free electron value), with a peak-to-peak linewidth of ca. 130 G.