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- W2052044963 abstract "The structure of a cyclopropane sorption complex of dehydrated fully Mn2+-exchanged zeolite X, Mn46Si100Al92O384 · 30C3H6 (a=24.690(4) Å), has been determined by single-crystal X-ray diffraction techniques in the cubic space group Fd3 at 21(1)°C. The crystal was prepared by ion exchange in a flowing stream of 0.05 M aqueous Mn(NO3)2 for three days, followed by dehydration at 460°C and 2×10−6 Torr for two days, and exposure to 100 Torr of cyclopropane gas at 21(1)°C. The structure was determined in this atmosphere and was refined to the final error indices R1=0.065 and R2=0.071 with 509 reflections for which I>3σ (I). In this structure, Mn2+ ions are located at two crystallographic sites. Sixteen Mn2+ ions fill the octahedral site I at the centers of the hexagonal prisms (Mn–O=2.290(9) Å). The remaining 30 Mn2+ ions are at site II; each extends 0.41 Å into the supercage (an increase of 0.27 Å upon C3H6 sorption as compared to fully dehydrated Mn46Si100Al92O384) where it coordinates to three trigonally arranged framework oxygens at 2.148(8) Å and complexes weakly and facially to a cyclopropane molecule by a primarily quadrupolar interaction. The carbon atoms of each cyclopropane molecule are equivalent and equidistant from its Mn2+ ion (Mn–C=2.95(9) Å). Because of high thermal motion, the C–C bond length is inaccurately determined; the value found, 1.21(8) Å, is too small." @default.
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- W2052044963 date "2000-11-01" @default.
- W2052044963 modified "2023-10-14" @default.
- W2052044963 title "Structure of a cyclopropane sorption complex of dehydrated fully Mn2+-exchanged zeolite X" @default.
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- W2052044963 doi "https://doi.org/10.1016/s1387-1811(00)00253-5" @default.
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