Periodic with crystal-like wall pore

Since the discovery of this first benzene-bridged mesoporous hybrid material with crystal-like pore walls, the series of organosilica precursors that give PMOs exhibiting molecular-scale periodicity was considerably extended. Kapoor et al. demonstrated with the formation of PMO products from the precursor 1,3 -bis(triethox-ysilyl)benzene (10) that a crystal-like organization of the organic bridges within the pore walls is not restricted to linear-substituted precursors.264... 

Table 3.3 Overview of Bis-Silylated Precursors that Show a Crystal-like Arrangement Within the PMO Pore Walls, Together with their Molecular Periodicity Length...

The ordered benzene-silica hybrid material[228] has a hexagonal array of mesopores with a lattice constant of 52.5 A, and crystal-like pore walls that exhibit structural periodicity with a spacing of 7.6 A along the channel direction. The periodic wall structure results from alternating hydrophilic and hydrophobic layers, composed of silica and benzene, respectively. 

---