Mn4 single-molecule-magnet-based polymers of a one-dimensional helical chain and a three-dimensional network: Syntheses, crystal structures, and magnetic properties

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Title:	Mn4 single-molecule-magnet-based polymers of a one-dimensional helical chain and a three-dimensional network: Syntheses, crystal structures, and magnetic properties
Authors:	Tsai, H.-L., Yang, C.-I., Wernsdorfer, W., Huang, S.-H., Jhan, S.-Y., Liu, M.-H., Lee, G.-H.
Contributors:	Department of Chemistry, Tunghai University
Date:	2012
Issue Date:	2013-05-14T09:02:27Z (UTC)
Abstract:	Two Mn4 single-molecule-magnet (SMM)-based coordination polymers, {[Mn4O(salox)3(N3) 3(DMF)2(H2O)(dpp)]?0.5MeOH}n (1?0.5MeOH; H2salox = salicylaldoxime; dpp = 1,3-di-4-pyridylpropane; DMF = N,N-dimethylformamide) and {[Mn 4O(Me-salox)3(N3)3(dpp) 1.5]?1.5Et2O}n (2?1.5Et 2O; Me-H2salox = hydroxyphenylethanone oxime), are self-assembled from Mn(ClO4)2?6H 2O/H2salox and Mn(ClO4)2? 6H2O/Me-H2salox systems with dpp and NaN3 in DMF/MeOH, respectively. Both compounds comprise a mixed-valence tetranuclear manganese core, [MnIIMnIII 3O]9+, which serves as a building unit for subsequent assembly via oximate and azido ligands. The flexible dpp ligand links with a Mn4 unit, leading to the formation of a one-dimensional helical structure in 1?0.5MeOH and a three-dimensional pcu network in 2?1.5Et2O. The magnetic data analysis shows that antiferromagnetic interactions within the Mn4 units resulted in S = 3/2 and 7/2 ground states for 1?0.5MeOH and 2?1.5Et2O, respectively. Both compounds show SMM behavior, as evidenced by frequency-dependent out-of-phase signals in alternating-current magnetic susceptibility and magnetic hysteresis loop studies with an energy barrier of Ueff = 37 K for 2?1.5Et2O. ? 2012 American Chemical Society.
Relation:	Inorganic Chemistry 51 (24) , pp. 13171-13180
Appears in Collections:	[化學系所] 期刊論文

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