Diiodination of Deca and Dodeca Silsesquioxanes A new rout to highly functionalized nano bulding block Silsesquixane cages

We describe the synthesis and characterization of diiodophenylsilsesquioxanes (SQs) [I2C6H3SiO1.5]n (n =8,10, 12) via ICl-promoted iodination (0 °C) with overall yields of 80-90% and > 95% 2,5-diiodophenyl selectivity. Characterization by 13C-NMR, 1H-NMR, FTIR, GC-Mass and TGA are reported and compared todata previously published for [Br2C6H3SiO1.5]n (n =8,10,12). These unique macromolecules possess high chemical functionality, offering the potential to develop homologous series of functionalized star and dendrimer compounds with quite different core geometries and thereby providing the potential to greatly vary structure-property relationships in derivative compounds and nanocomposites made therefrom. Oxidative stabilities more than 500 °C has been observed

Keywords:

Iodination , Synthesis , Phenyl Silsesquixane , Macromolecule , Nanocomposite