Une lettre inconnue de F.-H. Jacobi à J.-A. Comparet

Mortier, Roland

doi:10.3406/dhs.1971.950

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1974

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“…Distance calculations show that the hexagonal prism (centered at the origin) is in fact sufficiently large to accommodate a Tl4 (origin •> • 0(3),. 2,86(7); origin • • • 0(2), 3.62 (6) A). Moreover, the calculated angles (0(3)-origin-0(30, 86(3)®; 0(3)-origin-0(3"), 94(3)®] indicate that the coordination geometry would be very close to octahedral.…”

Section: Discussionmentioning

confidence: 99%

The crystal structure of hydrated thallium-exchanged zeolite X

Boer¹,

Maxwell²

1974

J. Phys. Chem.

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The crystal structure of hydrated TP-exchanged zeolite X has been determined by single-crystal X-ray diffraction techniques. The compound crystallizes in space group FdSm (o = 25.089 (5) A). Reflection data were collected with Cu ( 1.54182 A) radiation using a synthetic crystal with a maximum dimension of approximately 0.1 mm. A total of 281 observed reflections was obtained by counter methods and the structure was refined by least-squares techniques to a final conventional R factor of 0.13. TP ions are located inside the sodalite cages in front of the hexagonal prisms (site ) and in front of the six-membered ring face of the sodalite cage on the supercage side (site II). No water molecules and only 52% of the cations could be located. Unlocated cations and water molecules were included as uniformly distributed spheres.The shortest TP-0 distancés are 2.64 (5) and 2.79 (5) A.

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Section: Discussionmentioning

confidence: 99%