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Controlled Self-assembly of Metal-organic Networks

其他書名	Tuning the Magnetic Behavior of Prussian Blue Analogs and the Coordination Topology of Langmuir-Blodgett Films
出版	University of Florida, 2009
URL	http://books.google.com.hk/books?id=rI1dAQAACAAJ&hl=&source=gbs_api

註釋Prussian blue analog thin films were generated using a sequential adsorption method, tuning their transition metal composition and thickness by exchanging aqueous metal reactants and number of deposition cycles. The Prussian blue analog thin films displayed unique magnetic behavior, namely directional anisotropy, not observed in bulk powders. The magnitude of magnetic anisotropy was controlled by film thickness and transition metal composition. Scaling with the spin values of incorporated metal ions, the behavior can be qualitatively explained by considering the contributions of g value and single ion anisotropies. CTIST active Co-Fe PBA nanoparticles were synthesized using oil-water microemulsion procedures to restrict particulate growth. By tuning the concentration of interstitial cations and particle size, we demonstrated the ability to tune the temperature at which the thermal CTIST event takes place and the width of thermal hysteresis of the transition. Supramolecular assembly of metal-organic networks was investigated by reacting Langmuir monolayers of 4,4',4''-tricarboxytriphenylmethyl octadecyl ether with transition metal ion subphases. The precipitation and coordination topology of these networks was shown to be dependent upon the symmetry of the amphiphile, coordination geometry and charge of the subphase ions, and subphase acidity.