Octametallic complexes

Octametallic complexes, 162 cube,162 dicubanc, 163 [MsXf,l core, 162 planar octagon, 162 tetracapped tetrahedron, 163 Optica) isomerism cobalt ammines, 12 history, 180... 

Two octamolybdenum compounds, containing both bridging pyrazolate and terminal pyrazole ligands, [Mo8(pz)6(0),8(Hpz)6], 177, and [Mo8(pz)6-(0)2,(Hpz)6], 178, were prepared by the reaction of molten pyrazole with molybdenum oxides and their structures were determined by single-crystal X-ray diffraction (133). The overall geometries of 177 and 178 are similar. Both complexes consist of an octametallic framework that may be described as two bas-ally connected flattered trigonal pyramids. 

Scheme 2.71 shows the preparation of an octametallic star-shaped molecule containing cyclopentadienyliron arene complexes at the peripheries. The reaction of the organic core, 269, with the organometallic complex, 270, gave the organometallic star-shaped molecule, 271. A previously reported synthesis of 271 occurred via deprotonation of a permethylated iron complex. Astruc et al. have also reported silicon-containing star-shaped molecules, 272.312... 

Star polymers and dendrimers have been synthesized by Astruc using cyclopentadienyliron-mediated peralkylation, benzylation, and allylation reactions of cationic tri-, tetra-, and /iexa-methylbenzene cyclopentadienyliron com-plexes. " " These star and dendritic polymers contained cationic cyclopentadienyliron moieties at the core and/or the periphery. The cathodic reduction of nitrates and nitrites to ammonia has been achieved using a water-soluble dendrimer containing six cationic cyclopentadienyliron moieties as a redox catalyst. " The octametallic star (41) was prepared by deprotonation of permethylated iron complexes. ... 

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