Predictive design of ordered mesoporous silica with well-defined, ultra-large mesopores

Abstract

Tailor-made PPOn/2–PEOm–PPOn/2 polyethers are used to prepare ordered mesoporous silica materials with rationally addressable pore diameters between 4.5 and 21.5 nm.

Borane catalysis for epoxide (co)polymerization

“…Thus, using NHO/Et 3 B, Naumann and Bruckner synthesized a polyether series of PO n /2 -EO m -PO n /2 ( m = 90–795, n /2 = 10–280) and applied the resulting block copolyethers as templates for ordered mesoporous carbon (OMC) materials 104 or ordered mesoporous silica (OMS) materials. 105 The resulting mesopores could be tuned continuously between ca. 5–20 nm, whereby a linear relationship between n /2 and mesopore diameter was observed (Fig.…”

“…Borane-mediated epoxide homopolymerization has also been used to create tailored variants [98][99][100]104,105 of the "Pluronic"or "Reverse Pluronic"-triblock copolyethers (Fig. 3).…”

Tethering chiral Rh diene complexes inside mesoporous solids: experimental and theoretical study of substituent, pore and linker effects on asymmetric catalysis

“…Despite this progress in asymmetric heterogeneous Rh diene catalysis the influence of spacer type and lengths, pore size and polarity and type of support has not been examined so far. In order to gain more detailed insight into these various parameters we performed a combined theoretical and experimental study on a dedicated library of novel Rh norbornadiene complexes containing spacers of different types and lengths, which were immobilized on ordered mesoporous silica (OMS), 52–56 ordered mesoporous carbon (OMC) 57–59 and non-templated mesoporous SiO 2 (NT-mSiO 2 ) 60 with different pore sizes. While the OMS and OMC materials selected for this study have cylindrical shaped pores that are aligned with each other in a hexagonal fashion, they strongly differ in their surface composition and thus their polarity.…”