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Hydrothermal Synthesis and Crystal Structure of AgVMO 5 (M = Se, Te)
Author(s) -
Pitzschke Dragan,
Jansen Martin
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700101
Subject(s) - crystallography , hydrothermal circulation , tetrahedron , bipyramid , stoichiometry , pentagonal bipyramidal molecular geometry , crystal structure , square pyramidal molecular geometry , trigonal bipyramidal molecular geometry , hydrothermal synthesis , basal plane , chemistry , oxygen atom , octahedron , materials science , molecule , organic chemistry , seismology , geology
Single crystals of AgVSeO 5 and AgVTeO 5 were obtained under hydrothermal conditions at 190 °C by reacting stoichiometric amounts of AgNO 3 , NaVO 3 , TeO 2 and SeO 2 , respectively. AgVSeO 5 crystallizes in Pbcm with a = 418.14(3) pm, b = 2007.70(6) pm, c = 521.17(2) pm, V = 437.52(2) × 10 6 pm 3 and Z = 4, as red needles. The structure consists of VO 5 square pyramids, trigonal SeO 3 pyramids and AgO 8 polyhedra, as primary building units. The VO 5 square pyramids are linked to chains running along the c‐axis, by sharing oxygen atoms in the basal plane in cis‐position. The remaining basal O atoms of the VO 5 moieties are shared with two oxygen atoms of the SeO 3 units. The resulting polyanionic strands of composition [VSeO 5 ] − are interconnected by silver atoms to form a three dimensional network. AgVTeO 5 crystallizes as yellow needles in P2 1 /c with a = 586.59(1) pm, b = 1137.98(2) pm, c = 680.78(1) pm, β = 102.733(1)°, V = 443.26(1) × 10 6 pm 3 and Z = 4. The structure consists of VO 4 tetrahedra, Ψ‐trigonal‐bipyramidal TeO 4 units and AgO 8 polyhedra as primary building units. The TeO 4 groups form dimers by edge sharing, which are linked through vertices to the VO 4 tetrahedra. The resulting one dimensional polyanion is extending along [101]. The structural motifs and charge distribution according to Se 4+ /V 5+ , and Te 4+ /V 5+ respectively, seem to allow for a reshuffling of the charge distribution, thus inducing interesting physical phenomena, at elevated temperatures or pressures.