Molecular Magnetic Devices

Bis(phthalocyaninato) Lanthanide(lll) Complexes - from Molecular Magnetism to Spintronic Devices... 

Coronado E, Georges R, Tsukerblat B (1996) In Coronado E, Delhaes P, Gatteschi D, Miller JS (eds) Molecular magnetism from molecular assemblies to the devices, vol E321 (NATO ASI Series). Kluwer, The Netherlands, p 65... 

P. Giitlich, J. Jung, H. Goodwin. Spin crossover in iron(II)-complexes. In E. Coronado, P. Delhaes, D. Gatteshi, J. Miller, editors. Molecular Magnetism From Molecular Assemblies to the Devices, page 327. Kluwer, 1996. 

Finally, apart from the obvious future commercial applications of redox-active ligand systems to a new class of amperometric molecular sensing devices, they also promise to exhibit exciting new redox catalytic properties by promoting redox reactions on an included guest substrate, and novel solid-state anisotropic electronic, magnetic, and optical (49) behavior. 

The goal of materials research is really the reverse process, the bottom-up method. In this approach, it is hoped that perfect well-controlled nanoparticles, nanostrucmres, and nanocrystals can be synthesized, which may be compacted into macroscopic nanocrystalline samples, or assembled into superlattice arrays, which may, in mrn, be used in a variety of applications such as nanoelectronic or magnetic devices. Some scientists have even envisioned a time when so-called molecular assemblers will be able to mechanically position individual atoms or molecules, one at a time, in some predefined way (Drexler, 1986). The feasibility of such machines has been hotly debated but, regardless, such systems engineering goals are not really within the scope of this chapter. At present, methods for synthesizing metal and ceramic clusters and nanoparticles fall in one of two broad categories liquid phase techniques or vapor/aerosol methods. 

Some chemical substances have been used in the past as switches to control ion transport. Several new molecular sensory devices, which are responsive crown ethers used for the dynamic control of cation and anion binding induced by changes in pH, redox potential, temperature, light, and magnetic and electrical field, have been developed. These new ligands possess chromophores or fluorophores linked to the macrocycle, and display drastic variations in their photochemical and/or luminescent properties upon cation complexation. 

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