5Fe3+ + 3Fe RO H2O + 14L → Fe8O12L ROH

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Presentation transcript:

5Fe3+ + 3Fe2+ + 24RO- + 12 H2O + 14L → Fe8O12L143- + 24ROH Iron Oxide Molecular Clusters as Building Blocks of Non-Volatile Memory A joint research project between Xavier, Tulane and UNO teams Aims of the project: synthesis of novel polynuclear coordination complexes containing spin-coupled paramagnetic ions (single-molecule magnets) (V. Kolesnichenko, G. Goloverda) Structural and spectroscopic characterization of new compounds (C. Stevens) Magnetic properties studies (L. Spinu) Computational studies: energy of spin states (A. Burin, J. Perdew) The targets: molecular species with structure similar to structural motifs found in ferrimagnetic ferrites: The smallest atomic assembly representing structural motif of ferrites. Part One: Synthesis (ongoing) Strategy: metal ion condensation promoted by a base and tuned by complexing agent L: 5Fe3+ + 3Fe2+ + 24RO- + 12 H2O + 14L → Fe8O12L143- + 24ROH Variables: L (polydentate bridging/chelating ligand); Mn2+, Co2+ or metal(III) instead of Fe2+; reaction stoichiometry leading to larger clusters like Fe17O22(μ-L)6L16+, Fe26O26(μ-OR)18L18- Parts Two, Three, … Magnetic properties of new structurally characterized compounds will be studied Computational methods will be used to determine their electronic structure