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Silver Hydro Sodalite [Ag 3 (H 2 O) 4 ] 2 [Al 3 Si 3 O 12 ] 2 : Synthesis and Structure Determination by Combination of X‐ray Rietveld Refinement, Thermogravimetry, FT‐IR, and 1 H‐MAS NMR Spectroscopy
Author(s) -
EidenAßmann Stefanie,
Schneider Andreas M.,
Behrens Peter,
Engelhardt Guenter,
Mändar Hugo,
Felsche Juergen
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200106)2001:6<1527::aid-ejic1527>3.0.co;2-f
Subject(s) - sodalite , chemistry , thermogravimetry , rietveld refinement , crystallography , nuclear magnetic resonance spectroscopy , x ray crystallography , spectroscopy , crystal structure , zeolite , stereochemistry , diffraction , inorganic chemistry , organic chemistry , catalysis , physics , quantum mechanics , optics
Sodium hydro sodalite [Na 3 (H 2 O) 4 ] 2 [Al 3 Si 3 O 12 ] 2 was subjected to ion exchange with aqueous AgNO 3 solutions to yield silver hydro sodalite [Ag 3 (H 2 O) 4 ] 2 [Al 3 Si 3 O 12 ] 2 . A Rietveld structure refinement of the silver hydro sodalite structure based on powder X‐ray diffraction data recorded at room temperature (cubic, a = 8.950 Å, space group P ‐43n) led to a model where three silver cations form a triangle nearly parallel to a four‐membered ring of the sodalite cage. In combination with the four water molecules, a disorder model [Ag 3 (μ‐H 2 O) 2 (H 2 O) 2 ] 3+ is suggested. This structural arrangement is clearly different from that found in sodium hydro sodalite. Whereas the sodium hydro sodalite structure is dominated by cation−water interactions, the silver hydro sodalite structure reflects strong interactions between the cations and the oxygen atoms of the framework, strong interactions between the water molecules, but only weak ones between the cations and water molecules. In addition, weak Ag + ··· Ag + interactions may play a role. 1 H MAS NMR spectra show that the hydrogen atoms (which were not found in the Rietveld analysis) of the water molecules are involved in hydrogen bonding of different strengths and dynamics.