Purely-organic frameworks

Wuest et al. have also prepared a related tetrahedral tecton 8.63, which also produces a diamondoid polymeric framework. In this case, the solid-state network is seven-fold interpenetrated, with one diamondoid lattice filling much of the large cavities in those adjacent. It is possible that the interpenetration in this instance is a result of the self-complementary nature of the host, which contains an equal number of hydrogen bond donor and acceptor sites. However, even in this case small cavities exist, which are filled by two molecules of butyric acid per host formula unit. The formation of these kinds of framework materials opens entirely new possibilities for tailor-made porous materials with very large cavities, although it is unlikely that purely organic frameworks will ever rival aluminosilicate-based materials for sheer mechanical strength. 

Keywords Magnetism Metal-organic frameworks molecules Porosity Purely-organic frameworks... 

Realization of purely organic ferromagnets remains of multidisciplinary scientific interest. They are not yet usable realities, but it is already possible to state an overall conceptual framework for exploiting the magnetic properties of organic compounds. It is highly necessary to establish synthetic methods which enable us to obtain macroscopic spins almost stoichiometri-cally as designed. 

The nature of the solvent is an important parameter in hybrid synthesis, especially as it can sometimes be problematic to identify a solvent that is suitable for both the inorganic and the organic reactants. Obviously, the use of non-aqueous or mixed solvents has been widely adopted, just as it has in the case of purely inorganic frameworks, and the use of immiscible biphasic solvents,18 whereby the products form at the solvent interface, is an interesting strategy. Ionic liquids, which have been shown to be effective in the synthesis of inorganic framework materials,62 are just starting to be applied to hybrid frameworks.63... 

Porous materials are classified into several kinds depending on the pore size. According to the International Union of Pure and Applied Chemistry (lUPAC) notation, microporous materials have pore diameters of less than 2 mn and mesoporous materials have pore diameters between 2 and 50 nm. Macroporous materials have pore diameters of greater than 50 nm. Hydrothermal synthesis has been the technique of choice to prepare microporous phases. Ordered porous materials, including ordered mesoporous materials and the metal organic frameworks (MOFs), have also been synthesized generally under hydrothermal conditions [1-5]. In this section, we briefly present the synthesis of mesoporous silica materials and MOFs. 

Fig. 5 A schematic depicting the formation of metal oxide nanoparticles through the thermolysis in either air or nitrogen of the metal organic frameworks (a) a-Mg formate and (b) Zn-ADA-1. The formation of pure metal nanoparticles or metal oxide nanoparticles is governed by the reduction potential of the metal present. 2012 Royal Society of Chemistry.

In this section, pure MOF systems as well as composites comprising MOF-encapsulated redox-active materials or interpenetrated networks are considered (see Interpenetration and Entanglement in Coordination Polymers and Patterning Techniques for Metal-Organic Frameworks). The reversibility and stability of their electrochemical response are discussed. Stability may be defined as a retained electrochemical response on repeated cycling, whereas electrochemical reversibility is linked to the concept of fast electron transfer at the... 

Nuzhdin AL, Dybtsev DN, Bryliakov KP, Talsi EP, Fedin VP. Enantioselective chromatographic resolution and one-pot synthesis of enantiomerically pure sulfoxides over a homochiral Zn-organic framework. J Am Chem Soc 2007 129 12958-9. 

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