Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Chiral open-framework uranyl molybdates. 1. Topological diversity : Synthesis and crystal structure of [(C2H5) 2NH2]2[(UO2)4(MoO 4)5(H2O)](H2O). / Krivovichev, Sergey V.; Cahill, Christopher L.; Nazarchuk, Evgeniy V.; Burns, Peter C.; Armbruster, Th; Depmeier, Wulf.
в: Microporous and Mesoporous Materials, Том 78, № 2-3, 01.03.2005, стр. 209-215.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Chiral open-framework uranyl molybdates. 1. Topological diversity
T2 - Synthesis and crystal structure of [(C2H5) 2NH2]2[(UO2)4(MoO 4)5(H2O)](H2O)
AU - Krivovichev, Sergey V.
AU - Cahill, Christopher L.
AU - Nazarchuk, Evgeniy V.
AU - Burns, Peter C.
AU - Armbruster, Th
AU - Depmeier, Wulf
PY - 2005/3/1
Y1 - 2005/3/1
N2 - Crystals of a new framework uranyl molybdate, [(C2H 5)2NH2]2[(UO2) 4(MoO4)5(H2O)](H2O), were synthesized from a solution of UO2(CH3COO)2 · 2H2O, MoO3, diethylamine and HCl in H 2O at 220°C. The structure was studied at -127°C. The compound is hexagonal, space group P6522, a = 11.3612(13), c = 52.698(8)Å, V= 5890.7(13)Å3, Z =3. The structure has been refined to R1 = 0.050 (wR2 = 0.100; S = 0.985) on the basis of 3103 unique observed reflections. The structure consists of a three-dimensional framework of composition [(UO2) 4(MoO4)5(H2O)]2- that consists of UO7 pentagonal bipyramids that share equatorial corners with MoO4 tetrahedra. The framework contains a three-dimensional system of channels. The first system of channels is parallel to [001] and has the dimensions 7.0 × 7.0 Å, which result in a crystallographic free diameter (effective pore width) of 4.3 × 4.3 Å (based on an oxygen radius of 1.35 Å). Other channels run parallel to [100], [110] and [010] and have dimensions 5.2 × 7.1 Å (giving an effective pore width of 2.5 × 4.4Å). One symmetrically unique [(C2H 5)2NH2]+ cation and H2O molecule reside in the framework cavities. The channels parallel to [001] are chiral and are centered about a 65 screw axis. The uranyl framework with U:Mo = 4:5 in the structure of [(C2H5) 2NH2]2[(UO2)4(MoO 4)5(H2O)](H2O) represents the third known type of chiral uranyl molybdate framework. Its relationships to the frameworks with U:Mo = 5:7 and 6:7 can be understood in terms of fundamental chains that have related but yet different topological structure.
AB - Crystals of a new framework uranyl molybdate, [(C2H 5)2NH2]2[(UO2) 4(MoO4)5(H2O)](H2O), were synthesized from a solution of UO2(CH3COO)2 · 2H2O, MoO3, diethylamine and HCl in H 2O at 220°C. The structure was studied at -127°C. The compound is hexagonal, space group P6522, a = 11.3612(13), c = 52.698(8)Å, V= 5890.7(13)Å3, Z =3. The structure has been refined to R1 = 0.050 (wR2 = 0.100; S = 0.985) on the basis of 3103 unique observed reflections. The structure consists of a three-dimensional framework of composition [(UO2) 4(MoO4)5(H2O)]2- that consists of UO7 pentagonal bipyramids that share equatorial corners with MoO4 tetrahedra. The framework contains a three-dimensional system of channels. The first system of channels is parallel to [001] and has the dimensions 7.0 × 7.0 Å, which result in a crystallographic free diameter (effective pore width) of 4.3 × 4.3 Å (based on an oxygen radius of 1.35 Å). Other channels run parallel to [100], [110] and [010] and have dimensions 5.2 × 7.1 Å (giving an effective pore width of 2.5 × 4.4Å). One symmetrically unique [(C2H 5)2NH2]+ cation and H2O molecule reside in the framework cavities. The channels parallel to [001] are chiral and are centered about a 65 screw axis. The uranyl framework with U:Mo = 4:5 in the structure of [(C2H5) 2NH2]2[(UO2)4(MoO 4)5(H2O)](H2O) represents the third known type of chiral uranyl molybdate framework. Its relationships to the frameworks with U:Mo = 5:7 and 6:7 can be understood in terms of fundamental chains that have related but yet different topological structure.
KW - Chiral
KW - Crystal structure
KW - Nodal representation
KW - Open framework
KW - Uranyl molybdates
UR - http://www.scopus.com/inward/record.url?scp=13444270327&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2004.10.018
DO - 10.1016/j.micromeso.2004.10.018
M3 - Article
AN - SCOPUS:13444270327
VL - 78
SP - 209
EP - 215
JO - Zeolites
JF - Zeolites
SN - 1387-1811
IS - 2-3
ER -
ID: 36549855