Metallo-organic solids

As we have seen, the role of metal atoms in organometallic and metallo-organic solids may be simply to act as coordination centers, organizing the organic ligands (and the supramolecular functionality that they possess) in three dimensions. It is possible, however, for the metal atom itself to become involved in intermolecular interactions - it is in these cases that the system might be... 

Solution-Liquid-Solid (SLS) growth of semiconductor nanowires by Wang etal. (2006). The synthesis proceeds by a solution-based catalysed growth mechanism in which nanometer-scale metallic droplets catalyse the decomposition of metallo-organic precursors and crystalline nanowire growth. 

Over the last few years there has been an explosion of interest in this area and compounds displaying selective absorption, ion exchange and even catalytic properties have been reported.[1-3] Metallo-organic polymers do offer greater potential for chemical and structural diversity than traditional zeolite micro-porous solids, but are plagued by low dimensionality, lattice interpenetration and framework instability. Experience in constructing such materials can address most of these problems. 

As activated charcoal, metallo-phthalocyanines and solid free radicals catalyze these reactions, they form the oldest example of heterogeneous catalysis by organic and metallo-organic compounds. 

Design strategies in metallo-organic and organometallic solids... 

Adsorption on a solid catalyst surface, complex formation in homogeneous catalysis with metallo-organic complexes and in biocatalysis with enzymes share the same principle, i.e. the total number of sites is constant. Therefore, the rate expressions for reactions on heterogeneous, homogeneous and biocatalysts have a similar form. The constant number of active sites results in rate expressions that differ from homogeneous gas phase kinetics. Partial pressures are usually used in rate expressions for gas-phase reactions, while concentrations are used when the reactions take place in the liquid phase. It appears that definitions and nomenclature of particular kinetics constants in the different sub-communities differ sometimes. In the following sections the expressions used by the different subdisciplines will be compared and their conceptual basis outlined. 

The following approaches will be addressed (1) H202-assisted decomplexation of metallo-organic salts for ion-exchange, (2) om-pot synthesis of metal-exchanged-zeolites, and finally (3) room-temperature detemplation of parous solids (zeolites and mesoporous materials). The Fe-catalysts are comptued on the basis of their NaO-decomposition performance, both in pure N20/He and under simulated industrial conditions for nitric acid plants containing O2, NO and H2O. 

Kuo, C.Y. (1974) Electrical applications of thin-films produced by metallo-organic deposition. - Solid State Technol. 17(2), 49-55. 

Rare earth laser action has been obtained for two groups of liquids metallo-organic and inorganic aprotic liquids. The first group are chelate lasers and are reviewed by Lempicki and Samelson (1966) research on aprotic materials and systems for high-power, pulsed liquid lasers are reviewed by Samelson and Kocher (1974). Stimulated emission in both liquids occurs between 4f states of trivalent rare earths. Optical pumping is via xenon-filled flashlamps in optical cavities and resonators similar to those used in solid-state lasers. Rare earth liquid lasers have only been operated pulsed. 

Quite a different situation occurs in the metallophthalocyanine and porphyrin complexes of l2 Here PVP is an active participant. The resistivity in the solid state is depressed at the molar ratios 1 1 1 1 1 1 (see Table II) by an order of magnitude in the cases of FePHTH and MgMTBP. The latter complex shows a dramatic further drop in activation energy. This effect is thought to be due to a ternary interaction, rather than an interaction between the PVP l2 (1 1) complex and the 1 1 metallo-organic I complex as shown by the increase in resistivity of MgMTBP I2 PVP = 1 2 1. 

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