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Pentametallic lanthanide-alkoxide square-based pyramids: high energy barrier for thermal relaxation in a holmium single molecule magnet

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Microsoft Word - ESI_for_Ln5_Communication_v2.docx Supplementary Information for Magnetic relaxation and cooling in pentametallic lanthanide square- based pyramids Robin J. Blagg,a Floriana Tuna,a Eric J. L. McInnesa and Richard E. P. Winpenny*a a School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom. Tel: +44 (0) 161 275 4654; E-mail: [email protected] Fig. S1. Left: M(H) for 3 at 2 and 4 K. Right: M(H) for 5 at 1.8, 3, 5 and 7 K. Inset: M(H/T) of 3 (left) and 5 (right) at the same temperatures. Fig. S2. Left: M(H) for 4 at 1.8, 3, 5 and 7 K. Inset: M(H/T) of 4 at 1.8, 3, 5 and 7 K. Right: M(H) for 4 at 1.8 K between -70 and 70 kG. Electronic Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2011 Fig. S3. Left: experimental M(H) for 2 at several temperature between 2 and 10 K, with calculated Brillouin curve (green symbols; g = 2; T = 2 K) and fits (solid lines; g = 2; J = -0.085 cm-1) according to eq (1). Right: Calculated -ΔSm(T) for 2 at various fields (5 - 70 kG). Fig. S4. Left: Temperature dependence of the in-phase (χM’ ) ac susceptibility of 4 at zero-dc field and 1.55 G ac field. Right: Cole-Cole diagram at 1.8 K and zero-dc field, with the best fit to eq. 2 given as red line. Electronic Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2011 Fig. S5. Cole-Cole diagrams at 10 K for 4 at 0, 1.5, 3.5 and 5.5 kG dc fields. Solid lines represent the best fits to eq. 2. Fig. S6. Frequency dependence (in zero-dc field) of the (left) in-phase (χM’) and (right) out-of- phase (χM’’) ac susceptibility of 4 at several temperatures between 10 and 33 K. Solid lines represent the best fits to eq. 2. The results were used to construct the Arrhenius plot in Fig.5. 0)11( 1 01

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