Aqueous coordination and location of exchangeable Cu/sup 2 +/ cations in montmorillonite clay studied by electron spin resonance and electron spin-echo modulation
Journal Article
·
· J. Am. Chem. Soc.; (United States)
Electron spin resonance (ESR) and electron spin-echo modulation (ESEM) spectroscopies have been used to characterize the aqueous coordination and location of exchangeable Cu/sup 2 +/ cations in the interlayer regions of montmorillonite clay. Mg/sup 2 +/ montmorillonite, in which 5% of the exchangeable cations were replaced by Cu/sup 2 +/, was investigated. Under complete hydration, ESR indicates freely rotating Cu/sup 2 +/ ions in the interlayer region, and the corresponding ESEM indicates six directly bound water molecules. Under partial dehydration ESR shows Cu/sup 2 +/ in a second site with restricted rotation, and the corresponding ESEM indicates coordination to four water molecules. Following the collapse of the aqueous interlayer region on further dehydration, the Cu/sup 2 +/ enters a third site in a hexagonal cavity of the lattice structure, also with restricted rotation, in which it remains coordinated to only one water molecule. The natures and interconversions of these three sites are discussed.
- Research Organization:
- Univ. of Houston, TX (USA)
- OSTI ID:
- 7200391
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:9; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACOUSTIC ESR
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CLAYS
COPPER COMPOUNDS
DATA
DEHYDRATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
HYDRATION
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
MAGNETIC RESONANCE
MATERIALS
MONTMORILLONITE
NUMERICAL DATA
RESONANCE
SOLVATION
TRANSITION ELEMENT COMPOUNDS
400201* -- Chemical & Physicochemical Properties
ACOUSTIC ESR
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CLAYS
COPPER COMPOUNDS
DATA
DEHYDRATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
HYDRATION
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
MAGNETIC RESONANCE
MATERIALS
MONTMORILLONITE
NUMERICAL DATA
RESONANCE
SOLVATION
TRANSITION ELEMENT COMPOUNDS