A silica-supported double-decker silsesquioxane provides a second skin for the selective generation of bipodal surface organometallic complexes

Jeff Espinas (1) , Jérémie D.A. Pelletier (1) , Edy Abou-Hamad (1) , Lyndon Emsley (2) , Jean-Marie Basset (1)

1 KCC - KAUST Catalysis Center
2 ISA - Centre de RMN à très hauts champs

A well-defined silica-based material with a homogeneous nanolayer presenting identical pairs of vicinal silanols has been prepared by reaction of the surface organometallic species[ SiOZr(CH2CMe3)(3)], obtained on a silica dehydroxylated at 900 degrees C, with the double-decker-shaped silsesquioxane (OH)(2)DD(OH)(2). The surface structure has been established using extensive NMR characterization (H-1, C-13, Si-29, HETCOR, double-quantum, triple-quantum). Treatment with Zr(CH2CMe3)(4) leads to the first well-defined single-site bipodal grafted bis-neopentyl zirconium complex.

Mots clés: SOLID-STATE NMR; SITE HETEROGENEOUS CATALYSTS; OXIDE SUPPORTS; CHEMISTRY; SPECTROSCOPY; METATHESIS; REACTIVITY; POLYMERIZATION; ZIRCONIUM; ALKANES

Domaines: Chimie inorganique; Chimie organique

Jeff Espinas, Jérémie D.A. Pelletier, Edy Abou-Hamad, Lyndon Emsley, Jean-Marie Basset. A silica-supported double-decker silsesquioxane provides a second skin for the selective generation of bipodal surface organometallic complexes. Organometallics, 2012, 31 (21), pp.7610-7617. ⟨10.1021/om300918v⟩. ⟨hal-00799551⟩