Inelastic neutron scattering from tetramethylammonium cations occluded within zeolites
The use of organic bases, for example, tetraalklylammonium hydroxides, and other organic reagents has greatly enhanced the scope of gel/solution synthesis routes to crystalline microporous materials such as zeolites. The role of these organic components, however, continues to be the topic of considerable debate. The organic components first modify the gel structural chemistry. The presence of tetramethylammonium (TMA) hydroxide, for example, promotes the formation of double four-ring units in silicate solutions. Occlusion of organic gel components in zeolite crystal structures, however, leads also to the concept of a templating effect in which the organic component provides a basis around which the developing zeolite cages form. The mechanism of this templating process remains somewhat ill defined and must, at least, be of variable specificity. The authors describe here the use of inelastic neutron scattering (INS) to measure TMA template torsional vibrations, vibrations that provide to be sensitive to the strength of the interaction between the template cation and the enclosing zeolite cage.
- Research Organization:
- Argonne National Lab., IL
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6389133
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 109:13
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALKANES
CRYSTAL STRUCTURE
INELASTIC SCATTERING
VIBRATIONAL STATES
AMMONIUM HYDROXIDES
SILICON 29
NUCLEAR MAGNETIC RESONANCE
ZEOLITES
CATIONS
CLATHRATES
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
NEUTRON REACTIONS
STRUCTURAL CHEMICAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
AMMONIUM COMPOUNDS
BARYON REACTIONS
CHARGED PARTICLES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DATA
DIFFRACTION
ENERGY LEVELS
EVEN-ODD NUCLEI
EXCITED STATES
GRAVIMETRIC ANALYSIS
HADRON REACTIONS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MINERALS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SCATTERING
SILICON ISOTOPES
SPECTROSCOPY
STABLE ISOTOPES
THERMAL ANALYSIS
400201* - Chemical & Physicochemical Properties