Molecular magnetic materials multifunctional

In this paper we illustrate with novel examples the considerable impact of POMs in molecular magnetism and molecular materials. In the first part we show that ideal examples of large magnetic clusters can be designed, wherein magnetic exchange interactions can be chemically tuned and physically studied at the molecular level. In the second part we report the synthesis of highly conductive molecular materials based upon polyoxometalates and perylene. In the last section we show the possibilities offered by POMs to obtain multifunctional materials. 

Dithiadiazolyl radicals are of interest in the design of molecular conductors. Multifunctional radicals, for example, 1,3,5-C6H3 (CN2 82)3, have been prepared.Iodine doping increases the conductivity of these radical systems. Materials with unique magnetic properties are produced by introducing substituents that inhibit the dimerization process. ... 

SMMs are a class of magnetic molecules that exhibit borderhne behavior between classical and quantum physics and offer the possibihty of storing magnetic information at the molecular level. The incorporation of SMMs into new, multifunctional materials is thus expected to become a very fruitful research area in the near future. We have illustrated selected examples of Mni2-containing materials in which the SMM complex not only carries its unique magnetic properties, but also leads to structural reinforcement or enhanced electrical conductivity of a polymeric network. In fhis area, the importance of controlled structural alteration and molecular design cannot be overemphasized. 

Furthermore, metals present additional intrinsic properties, such as redox reversibility, magnetism and luminescence. It is, therefore, possible to take benefit from these peculiarities for the design of redox-controlled NLO switches as illustrated in this chapter or for the elaboration of materials combining two or more properties. This latter field of research is in its infancy but it is possible to anticipate many improvements in the future for the elaboration of multifunctional molecular material optimising simultaneously all the wonderful capacities of metals. 

In more recent times, the field has increasingly focused on topics where molecular materials have an advantage over continuous-lattice solids. Such studies can exploit the modular synthesis of molecular materials, whereby different molecules with differing functions can be combined to form a hybrid material with interacting magnetic and/or conducting and/ or optical properties. This is leading to new fields such as molecular spintronics, multifunctional and switchable materials where... 

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