Zirconium silsesquioxane

Tethering approaches with Si(OEt)Me2 substituents on the ring, appropriate for both solid state sol-gel chemistry toward Zr-functionalized support and for solution chemistry toward analogous zirconium silsesquioxanes, exist [39]. 

In summary, zirconocene and half-sandwich zirconium-based catalysis has been developed both in surface and solution systems. In general, the activation of Zr-POSS and silica-supported zirconium system with MAO proved inappropriate (see silsesquioxane displacement and leaching, respectively, vide supra), while the acti-vahon with BArl proved more efficient, albeit structural rearrangement complicates the activation chemistry and simple Zr(IV) cationic alkyl species are seldom the outcome of the activation. 

Zirconium Acetylacetonate Sihca supported Zr(lV) acetylacetonate surface complex [(=SiO)3Zr(acac)] (acac = MeCOCHCOMe) catalyzes transesterification reactions [114]. Satisfying silsesquioxane models have been reported [2, 114]. 

The 0-d nanoparticles can be nano-metal oxides (such as silica,1 titania,2 alumina3), nano-metal carbide,4 and polyhedral oligomeric silsesquioxanes (POSS),5 to name just a few the 1-d nanofibers can be carbon nanofiber,6 and carbon nanotubes (CNT),7 which could be single-wall CNTs (SWCNT) or multiwall CNTs (MWCNT) etc. the 2-d nano-layers include, but are not limited to, layered silicates,8 layered double hydroxides (LDH),9 layered zirconium phosphate,10 and layered titanates,11 etc. 3-d nano-networks are rarely used and thus examples are not provided here. 

Kaneko Y, Arake T (2012) Sol-gel preparation of highly water-dispersible silsesquioxane/ zirconium oxide hybrid nanoparticles. Int J Polym Sci 2012 1-6... 

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