Add time:08/07/2019         Source:sciencedirect.com

Organic-inorganic hybrid aluminosilicate compounds KCS-3 and KCS-4 were successfully synthesized by low-temperature hydrothermal reaction of mother gels composed of organically-bridged silane, fumed alumina, alkali metal hydroxide and water. Two bridged organosilanes i.e. 4,4′-bis(triethoxysilyl)-1,1′-biphenyl (BTEbP) and 1,4-bis(triethoxysilyl)benzene (BTEB) were used as a Si source for the synthesis of KCS-3 and KCS-4, respectively. The presence of T3 (≡O3Si–R, R: organic group) local structure, AlO4 tetrahedral unit and the organic groups originating from the employed organosilane were confirmed by 29Si, 27Al and 13C MAS NMR measurements. Their crystal structures were solved by the direct space method using the parallel tempering algorithm from powder X-ray diffraction data. The crystal structure of KCS-3 belongs to tetragonal symmetry (lattice constants: a = 10.22 Å and c = 71.37 Å, space group: I41/amd). Four aluminosilicate layers composed of 4-ring and 8-ring were stacked along c-axis, and adjacent layers were connected alternately by a biphenyl pillar (–C6H4–C6H4–) and a Q2 Si pillar (–OSi(OH)2O–). KCS-3 showed amphiphilic adsorption properties, reflecting the presence of hydrophilic- and lipophilic-inner spaces. On the other hand, the crystal structure of KCS-4 belongs to monoclinic symmetry (lattice constants: a = 10.05 Å, b = 9.349 Å, c = 5.052 Å and β = 97.01°, space group: P21/c). A large amount of Li ions forming four-coordination environment is included in a layer-like framework, and adjacent layers were bridged by a phenylene group, that is, KCS-4 can be regarded as a hybrid-type lithosilicate.

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