Chemistry of Materials · 2000 · 105 citations · 32 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials CharacterizationMaterials ChemistryCrystal ChemistryCrystal EngineeringCrystallization ProcessesCrystallographyX-ray CrystallographyX-ray DiffractionCrystal Chemistry Of SilicatesCrystal Structure RefinementPowder DiffractionRietveld RefinementSilicate Crystal StructuresSilicate Structural TopologyStructure SolutionUnit Cell Parameters
The synthesis, structure solution, and characterization of the layered silicate MCM-47 are described. MCM-47 is synthesized using a diquaternary ammonium salt prepared from the reaction of 1-methylpyrrolidine with 1,4-dibromobutane. The structure solution of MCM-47 using Monte Carlo methods and the FOCUS algorithm shows that the material is composed of ferrierite layers. The Rietveld refinement of synchrotron X-ray powder diffraction data in space group Cmcm gives unit cell parameters a = 7.386 Å, b = 22.454 Å, and c = 14.018 Å and agreement values of Rp = 5.20%, Rwp = 6.99%, and χ2 = 3.01. The results of the structure refinement and the 1H MAS NMR spectrum indicate that the layers of MCM-47 are held together by strong hydrogen bonds. Energy minimization calculations of the organic structure directing agent within the layers of MCM-47 suggest that geometric complementarity between the organic and inorganic components can explain the unusual stacking arrangement of the ferrierite sheets.
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An Introduction to Clay Colloid Chemistry
H. van Olphen · Soil Science · 1964 · 2.6K citations
Environmental Chemistry of Soils
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