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Synthesis and Properties of Cationic Polynulcear Complexes of Manganese with the Anionic Keggin Type Polyoxometalates as Single Molecule Magnets Hx[Mn4O2(CH3COO)7(bipy)2]n[Kegiin-Polyoxometalates]m.yH2O

Daneshmand Kashani, Pargol | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43660 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Mohammdi Boghaei, Davar
  7. Abstract:
  8. Single molecule magnets due to their magnetic tunneling effect and the interaction they have with an external magnetic field are used widely in quantum computing and also the storage of data with high capacities. Polyoxometalates that are used as counter ions for cationic single molecule magnets, are able to affect their spin-couple nature via a magnetic exchange and also have an influence on the crystal accumulation in order to change the magnetic property of the molecule. In this research the probability of sedimenting a cationic single molecule magnet, [Mn4O2(CH3COO)7(bipy)2]+, with the use of anionic polyoxometalates with Keggin structures has been investigated. Thus, the single molecule magnet hybrid salts:
    H3[Mn4O2(MeCO2)7(bipy)2][SiMo12O40].4H2O , H [Mn4O2(MeCO2)7(bipy)2]2[PMo12O40].6H2O
    H2[Mn4O2(MeCO2)7(bipy)2]2[SiW12O40].4H2O , H2[Mn4O2(MeCO2)7(bipy)2][PW12O40].3H2O
    have been synthesized and also have been identified using elemental analysis, CHN, ICP, thermalgravimetric analysis (TGA) and FTIR. SEM images have been used as a probe for such hybrid salts and have shown spherical properties arranged in a non-uniform macro and nano patterns. In addition, for an electrochemical inspection of these salts, modified electrodes have been prepared and their stability on the surface of these electrodes have been examined. The results were used to identify the dominant oxidizing numbers of the single molecule magnet and its counter ion pair, polyoxometalates present in the environment.
  9. Keywords:
  10. Single Molecule Magnet ; Polynuclear Complexes ; Quantum Computation ; Magnetic Tunneling ; Keggin Type Polyoxometalate

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