TY  - JOUR
AU  - Tuel, Alain
AU  - Caldarelli, Stefano
AU  - Meden, Anton
AU  - McCusker, Lynne B.
AU  - Baerlocher, Christian Baerlocher
AU  - Ristic, Alenka
AU  - Rajić, Nevenka
AU  - Mali, Gregor
AU  - Kaučič, Venčeslav
PY  - 2000
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6400
AB  - The triclinic form of AlPO4-34, a microporous aluminophosphate with the chabazite (CHA) topology, adopts a rhombohedral symmetry upon calcination. The framework structure of this phase remains intact under ambient conditions, but it distorts dramatically, though reversibly, in the presence of water. Following these structural changes in situ by X-ray diffraction revealed that there are actually two stable rehydrated phases, which differ from each other by one water molecule in the channel. Both of these phases have triclinic unit cells that are closely related to that of the calcined rhombohedral phase. The structure of the low-temperature (10 °C), fully rehydrated phase (phase B) was elucidated by combining high-resolution synchrotron powder diffraction with solid-state NMR techniques. Coordination of three of the six Al atoms to water molecules causes the deformation of the framework and the reduction of the symmetry. Rietveld refinement of the structure of phase B in the triclinic space group P1 (a = 9.026, b = 9.338, c = 9.508 Å, α = 95.1°, β = 104.1°, and γ = 96.6°) converged with RF = 0.079 and RWP = 0.176 (Rexp = 0.087). Framework connectivities derived from the structure were used to assign 31P NMR lines as well as part of the 27Al NMR signal.
PB  - American Chemical Society
T2  - The Journal of Physical Chemistry B
T1  - NMR Characterization and Rietveld Refinement of the Structure of Rehydrated AlPO4-34
EP  - 5705
SP  - 5697
VL  - 104
DO  - 10.1021/jp000455a
ER  - 

@article{
author = "Tuel, Alain and Caldarelli, Stefano and Meden, Anton and McCusker, Lynne B. and Baerlocher, Christian Baerlocher and Ristic, Alenka and Rajić, Nevenka and Mali, Gregor and Kaučič, Venčeslav",
year = "2000",
abstract = "The triclinic form of AlPO4-34, a microporous aluminophosphate with the chabazite (CHA) topology, adopts a rhombohedral symmetry upon calcination. The framework structure of this phase remains intact under ambient conditions, but it distorts dramatically, though reversibly, in the presence of water. Following these structural changes in situ by X-ray diffraction revealed that there are actually two stable rehydrated phases, which differ from each other by one water molecule in the channel. Both of these phases have triclinic unit cells that are closely related to that of the calcined rhombohedral phase. The structure of the low-temperature (10 °C), fully rehydrated phase (phase B) was elucidated by combining high-resolution synchrotron powder diffraction with solid-state NMR techniques. Coordination of three of the six Al atoms to water molecules causes the deformation of the framework and the reduction of the symmetry. Rietveld refinement of the structure of phase B in the triclinic space group P1 (a = 9.026, b = 9.338, c = 9.508 Å, α = 95.1°, β = 104.1°, and γ = 96.6°) converged with RF = 0.079 and RWP = 0.176 (Rexp = 0.087). Framework connectivities derived from the structure were used to assign 31P NMR lines as well as part of the 27Al NMR signal.",
publisher = "American Chemical Society",
journal = "The Journal of Physical Chemistry B",
title = "NMR Characterization and Rietveld Refinement of the Structure of Rehydrated AlPO4-34",
pages = "5705-5697",
volume = "104",
doi = "10.1021/jp000455a"
}

Tuel, A., Caldarelli, S., Meden, A., McCusker, L. B., Baerlocher, C. B., Ristic, A., Rajić, N., Mali, G.,& Kaučič, V.. (2000). NMR Characterization and Rietveld Refinement of the Structure of Rehydrated AlPO4-34. in The Journal of Physical Chemistry B
American Chemical Society., 104, 5697-5705.
https://doi.org/10.1021/jp000455a

Tuel A, Caldarelli S, Meden A, McCusker LB, Baerlocher CB, Ristic A, Rajić N, Mali G, Kaučič V. NMR Characterization and Rietveld Refinement of the Structure of Rehydrated AlPO4-34. in The Journal of Physical Chemistry B. 2000;104:5697-5705.
doi:10.1021/jp000455a .

Tuel, Alain, Caldarelli, Stefano, Meden, Anton, McCusker, Lynne B., Baerlocher, Christian Baerlocher, Ristic, Alenka, Rajić, Nevenka, Mali, Gregor, Kaučič, Venčeslav, "NMR Characterization and Rietveld Refinement of the Structure of Rehydrated AlPO4-34" in The Journal of Physical Chemistry B, 104 (2000):5697-5705,
https://doi.org/10.1021/jp000455a . .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Meden, Anton
AU  - Sarv, Priit
AU  - Kaučič, Venčeslav
PY  - 1998
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5063
AB  - The tris(1,2-diaminoethane)nickel(II) complex was found to be a novel structure-directing agent for the preparation of the chabazite-like AlPO4-34 molecular sieve. During crystallization the complex undergoes a ligand exchange, thus helping stabilization of the AlPO4's chabazite structure by hydroxyls that have exchanged one 1,2-diaminoethane (en) molecule from the Ni(II) coordination sphere. The exchanged complex, [Ni(en)2(OH)2], remains in the chabazite host causing a triclinic deformation of the rhombohedral chabazite framework. Upon calcination the triclinic phase completely transforms into the rhombohedral chabazite-like AlPO4-34 as evidenced from the in situ XRD pattern.
PB  - Elsevier
T2  - Microporous and Mesoporous Materials
T1  - A novel triclinically deformed chabazite-like aluminophosphate prepared in the presence of tris(1,2-diaminoethane)nickel(II) chloride
EP  - 87
IS  - 1-3
SP  - 83
VL  - 24
DO  - 10.1016/S1387-1811(98)00146-2
ER  - 

@article{
author = "Rajić, Nevenka and Meden, Anton and Sarv, Priit and Kaučič, Venčeslav",
year = "1998",
abstract = "The tris(1,2-diaminoethane)nickel(II) complex was found to be a novel structure-directing agent for the preparation of the chabazite-like AlPO4-34 molecular sieve. During crystallization the complex undergoes a ligand exchange, thus helping stabilization of the AlPO4's chabazite structure by hydroxyls that have exchanged one 1,2-diaminoethane (en) molecule from the Ni(II) coordination sphere. The exchanged complex, [Ni(en)2(OH)2], remains in the chabazite host causing a triclinic deformation of the rhombohedral chabazite framework. Upon calcination the triclinic phase completely transforms into the rhombohedral chabazite-like AlPO4-34 as evidenced from the in situ XRD pattern.",
publisher = "Elsevier",
journal = "Microporous and Mesoporous Materials",
title = "A novel triclinically deformed chabazite-like aluminophosphate prepared in the presence of tris(1,2-diaminoethane)nickel(II) chloride",
pages = "87-83",
number = "1-3",
volume = "24",
doi = "10.1016/S1387-1811(98)00146-2"
}

Rajić, N., Meden, A., Sarv, P.,& Kaučič, V.. (1998). A novel triclinically deformed chabazite-like aluminophosphate prepared in the presence of tris(1,2-diaminoethane)nickel(II) chloride. in Microporous and Mesoporous Materials
Elsevier., 24(1-3), 83-87.
https://doi.org/10.1016/S1387-1811(98)00146-2

Rajić N, Meden A, Sarv P, Kaučič V. A novel triclinically deformed chabazite-like aluminophosphate prepared in the presence of tris(1,2-diaminoethane)nickel(II) chloride. in Microporous and Mesoporous Materials. 1998;24(1-3):83-87.
doi:10.1016/S1387-1811(98)00146-2 .

Rajić, Nevenka, Meden, Anton, Sarv, Priit, Kaučič, Venčeslav, "A novel triclinically deformed chabazite-like aluminophosphate prepared in the presence of tris(1,2-diaminoethane)nickel(II) chloride" in Microporous and Mesoporous Materials, 24, no. 1-3 (1998):83-87,
https://doi.org/10.1016/S1387-1811(98)00146-2 . .