Intercalation in montmorillonite of molybdenum cations containing the Mo/sub 6/Cl/sub 8/ cluster core
Molybdenum cations containing the Mo/sub 6/Cl/sub 8/ cluster core have been intercalated in montmorillonite. cluster ions of the type (Mo/sub 6/Cl/sub 8/(H/sub 2/O)/sub 6-n/(OH)/sub n/)/sup (4-n)+/ were formed by argentometric titration of (Mo/sub 6/Cl/sub 8/)Cl/sub 4/ x 2H/sub 2/O to remove the four terminally bonded chlorines. At pH = 1.5 the clusters occupy the gallery region between the silicate layers of montmorillonite by displacement of Na/sup +/. The cluster intercalates mainly as monopositive cations (n = 3), along with some dipositive cations (n = 2). The maximum cluster loading (80 mmoles/100 g) exceeds the value expected on the basis of ion exchange alone (60 mmoles/100 g). The gallery height of 7.3 A for the new intercalate is compatible with the C/sub 4/ axis of the Mo/sub 6/Cl/sub 8/ core being oriented perpendicular to the silicate layers. Thermolysis of the intercalated clusters at 240/sup 0/C results in the oxidation of the intercalated clusters to molybdenum oxide. Cluster decomposition is accompanied by the collapse of some galleries, while others remain propped open by 3.9 A. The latter value corresponds to two layers of oxygen in the galleries. Thus the oxide is nonuniformly distributed on both the internal and external surfaces of the clay. Complete gallery collapse is observed at 300/sup 0/C.
- Research Organization:
- Michigan State Univ., East Lansing
- OSTI ID:
- 6954830
- Journal Information:
- J. Solid State Chem.; (United States), Vol. 64:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Incorporation of chelated cobalt complexes and polyoxocations of aluminum in montmorillonite
Determination of the N–H Bond Dissociation Free Energy in a Pyridine(diimine)molybdenum Complex Prepared by Proton-Coupled Electron Transfer
Related Subjects
HYDRATES
CRYSTAL STRUCTURE
HYDROLYSIS
OXIDATION
MOLYBDENUM CHLORIDES
MOLYBDENUM OXIDES
CHEMICAL REACTION YIELD
ABSORPTION SPECTROSCOPY
EXPERIMENTAL DATA
HEATING
HIGH TEMPERATURE
INFRARED SPECTRA
PH VALUE
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
X-RAY DIFFRACTION
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
DATA
DECOMPOSITION
DIFFRACTION
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LYSIS
MOLYBDENUM COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SOLVOLYSIS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
YIELDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies