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- W2089312888 abstract "The powder synchrotron X-ray diffraction pattern of a mixed sodium–silver–Y zeolite, Ag56−xNaxSi136Al56O384 x≈19, saturated with pyridine, has been analysed by the Rietveld method to reveal positions for the adsorbed molecules. Cations are distributed over three sites, SII, constrained to 100% occupancy, with 17.2(1) and 14.8(1) Ag(1) and Na(1) ions per unit cell, respectively, SI′ with 18.3(1) Ag(2) ions per cell, and SI with 1.8(1) Ag(3) ions per cell. The refinement suggests that approximately 7.5 pyridine molecules are adsorbed per supercage, located in two sites within the cavities of the zeolite. Pyridine(1) is in the 12-ring window connecting supercages. Three molecules project through each window and approach the SII cations in a supercage, with an average Ag(1)–N distance of 3.17(2) Å. An SII cation can be linked to three pyridine(1) molecules from three separate windows. These sites are full with 5.98(2) molecules per supercage. Pyridine(2) is found in the supercage, oriented with its π electron density towards the SII cations, with its centre at 2.87(2) Å from Ag(1). The average occupancy was fixed at 1.5 molecules per supercage, corresponding to 20% of the pyridine content. A local ordering scheme can be postulated, whereby alternate supercages are filled by pyridine(1) and pyridine(2) molecules, efficiently filling the channels of the zeolite." @default.
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- W2089312888 date "1999-09-01" @default.
- W2089312888 modified "2023-10-11" @default.
- W2089312888 title "The location of pyridine in sodium–silver–Y zeolite by powder synchrotron X-ray diffraction" @default.
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- W2089312888 doi "https://doi.org/10.1016/s1387-1811(99)00036-0" @default.
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