Immobilization of Rare-Earth Metal Silyl amide Complexes

Immobilization of Rare-Earth Metal (Silyl)amide Complexes 

EA = elemental analysis IR = infrared spectroscopy PXRD = powder X-ray diffraction BET = Brunauer-Emmett-Teller method (specific BET surface area) and BJH = Barrett-)oyner-Halenda method (determination of pore volume and diameter), both determined by nitrogen physisorption  

For Grace 1 332 silica (Vp = 1.55cm g, as = 320m g , particle size = 32-38jim) and Grace 432 silica 

A detailed study on the immobilization of Ln[N(SiMe3)2]3 on fumed silica showed that the nature of the grafted species is considerably affected by the thermal pretreatment of the support [117]. Whereas at low (AS-380.2so) and intermediate dehydroxylation temperatures (AS-380.5oo) mixtures of bipodal [(=SiO)2Ln N(SiMe3)2 ] and monopodal [(=SiO)Ln N(SiMe3)2 2] species prevailed 

Lewis acidic support materials obtained via chemisorption of trimethylalumin-ium on MCM-41.280 (dp = 2.7nm) have been employed for desolvation of the 

---