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Synthesis, Characterization and Voltametric Study of Single Molecule Magnet Hybrid Salts [Mn3O(O2CMe)6(Pyr)3][Keggin-Polyoxometalates]Type

Kazemi Movahed, Leily | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42339 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Mohammadi Boghaei, Davar
  7. Abstract:
  8. Molecular nanomagnets, also known as Single Molecule Magnets (SMMs) are a class of molecules that at low temperature exhibit magnetic hysteresis of pure molecular origin and not related to a cooperative effect. In the past fifteen years they have attracted great interest for their potentiality to act as magnetic memory units and for the many quantum effects in the dynamics of their magnetization. Organization of SMM on surfaces is the first step in order to address the magnetic state of a single molecule or to connect the molecule to a conducting substrate. The complex nature of SMMs and the peculiar origin of their magnetic bistability have been representing for half a decade an obstacle to the development of this research field. In this research we have successfully deposited cationic [Mn3O(CH3COO)6(Pyr)3]+ onto different keggin Polyoxoanions Surfaces. Polyoxometalates (POMs) are a large and incredibly varied family of metal oxide clusters that can display many useful properties including magnetism, catalysis and semi-conductivity. Characterization of the novel SMM hybrid salts that we have synthesized such as: H3[Mn3O(CH3COO)6(Pyr)3][SiMo12O40].7H2O, H2[Mn3O(CH3COO)6(Pyr)3][PMo12O40].8H2O, 2[Mn3O(CH3COO)6(Pyr)3]2[SiW12O40].12H2O, H[Mn3O (CH3COO)6(Pyr)3]2[PW12O40].13H2O investigated by FTIR, TGA, and Elemental Analyzers, CHN and ICP. We use Scanning Electron Microscope (SEM) to investigation of morphologies of these salts. Presence of the both micro and nano particles in three of them was found, whereas the other one just contains from nano particles. In addition we have applied these hybrid salts as Chemically Modified Electrode (CME) for investigated of electrochemical properties of these novel SMM hybrid salts. The following results; the changes of the oxidation states of Mn, Mo and W in the synthesized hybrid salts of single molecule magnets, presence of Mn(III) as the main ion and the highest oxidation state of W and Mo ions in POMs has been approved
  9. Keywords:
  10. Single Molecule Magnet ; Nanomagnetism ; Manganese ; Polyoxometalates ; Hybrid Salts

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