Metal-organic polyhedra

FIGURE 9.38 (a) Crystal Structure of Metal-Organic Polyhedron Composed of Cu(ll) and 5-Bromo-1,3-benzenedicarboxylate. 

Hydrotris(3,4,5-tribromopyrazolyl)borate ligand 258, TpBra, was examined for the cyclopropanation reaction of diazoacetate (Scheme 1.123) [180]. This complex worked in fluorous media and was readily recovered and recycled. Surface hydroxyl groups on metal-organic polyhedron 259 were used as the cyclopropanation catalyst (Scheme 1.124) [181]. 

Singh HB, Sudha N (1996) OrganoteUurium precursors for metal organic chemical vapour deposition (MOCVD) of mercury cadmium telluride (MCT). Polyhedron 15(5-6), 745-763... 

For metal atoms the state of lowest Gibbs Free Energy is achieved when they are organized in a macroscopic polyhedron. High dispersion on a support requires strong chemical interaction between metal and support, conventionally called chemical anchoring The formation of solid particles either from the vapor or from an adsorbed precursor is dominated by two kinetic processes ... 

Regioselective synthesis is examined mainly on the basis of the conception of competitive coordination and the principle of hard and soft acids and bases [14]. A description of polyhedron-programmed synthesis is given, taking into consideration thin structure compounds to be used as ligands (number, nature, and mutual situation of donor centers and the presence and character of organic fragments, annealed to a metal-cycle). 

The stmctures discussed above show an enormous range of stmc-tural t3 es, and a frustration in this area is the inability to recognize any central organizing principle to describe and rationalize these stmctures. Several families of cages exist, however, in which cages can be grouped by the metal polyhedron displayed. Three of these families of cages are discussed briefly below. 

Organic Inorganic Organo- metallic Example Vertices Missing from Parent Polyhedron Electrons Short of Filled Shell... 

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