Synthesis and Crystal Structure of Pb₃O₂(SeO₃)

Abstract

Single crystals of Pb 3 O 2 (SeO 3 ) have been prepared hydrothermally at 230°C. The structure (orthorhombic, Cmc2 1 , a ϭ 10.529(2), b ϭ 10.722(2), c ϭ 5.7527(12) Å , V ϭ 649.5(2) Å 3 ) has been solved by direct methods and refined to R 1 ϭ 0.059 on the basis of 615 unique observed reflections (ΗF o Η ϭ 4σ F ). The structure is based upon double [O 2 Pb 3 ] 2ϩ chains of edge-sharing [OPb 4 ] 6ϩ tetrahedra. These [O 2 Pb 3 ] 2ϩ chains run parallel to [001], and their Synthese und Kristallstruktur von Pb 3 O 2 (SeO 3 ) Inhaltsübersicht. Einkristalle von Pb 3 O 2 (SeO 3 ) wurden hydrothermal bei 230°C dargestellt. Die Struktur (orthorhombisch, Cmc2 1 ; a ϭ 10.529(2), b ϭ 10.722(2), c ϭ 5.7527(12) Å , V ϭ 649.5(2) Å 3 ) konnte durch Direkte Methoden gelöst und auf der Grundlage von 615 symmetrieunabhängigen, beobachteten Reflexen (mit ΗF o Η Ն 4σ F ) zu R 1 ϭ 0.059 verfeinert werden. Die Kristallstruktur enthält Doppelketten der Zusammensetzung [O 2 Pb 3 ] 2ϩ , die aus kantenverknüpften Ketten von [OPb 4 ] 6ϩ -Tetraedern bestehen. Diese [O 2 Pb 3 ] 2ϩ -Ketten verlaufen parallel zu [001] und sind nach Art ei-* Dr.planes are parallel to (010). The pyramidal (SeO 3 ) 2Ϫ anions are located between the chains; their triangular oxygen atom bases lie parallel to (001) and all (SeO 3 ) 2Ϫ groups are pointing in the same direction. A short compilation of [O 2 M 3 ] chains of oxocentred M 4 tetrahedra in minerals and inorganic compounds is provided. ner hexagonal-dichtesten Stabpackung parallel zur (010)-Ebene orientiert. Die pyramidalen (SeO 3 ) 2Ϫ -Anionen sind zwischen den Ketten angeordnet und halten diese zusammen. Ihre dreieckigen Sauerstoff-Grundflächen kommen parallel (001) zu liegen und sämtliche (SeO 3 ) 2Ϫ -Gruppen zeigen in die gleiche Richtung. Zum Abschluß wird eine kurze Zusammenstellung von [O 2 M 3 ]-Ketten aus sauerstoffzentrierten M 4 -Tetraedern in Mineralen und anorganische Verbindungen gegeben.

Crystal chemistry of the mendipite-type system Pb3O2Cl2—Pb3O2Br2

“…1b). Such chains have previously been observed in the crystal structures of many natural and synthetic lead oxocentered compounds (Krivovichev et al, 2004;Siidra et al, 2007e). In crystal structures of the studied compounds, the chains occur in two mutually perpendicular orientations with the angle varying from 82.48(12) (M11) to 89.36 (15) (M6).…”

Design of New Structural Types from Oxocentered Tetrahedra : Continuous Polycationic Series from 1D Chains to 2D Planes in New Bismuth Compounds

“…Then, the simple observation [Bi 2 O 2 ] 2+ layers of Aurivillius or Sillen's compounds [19,20] and of the high temperature δ-Bi 2 O 3 (fluorite type) reveals the existence of edge-sharing oxygen-centred OBi 4 tetrahedra arranged into various dimensionalities, e.g. The notion of antistructure based on OM x frameworks is known for a long time from the observation of rare earth oxides and oxysalts, lanthanide salts [22][23][24][25], to several systems containing distorted MOx polyhedra by O'Keeffe et al [6], and closer to our preoccupation to OPb 4 tetrahedra by Krivovichev et al [26][27][28][29][30]. In the same manner, this description shows anlogy between bismuth oxide polymorphs (including the new ε form) through the rotation of 1D chains of edge-sharing OBi 4 tetrahedra [21].…”

High‐Pressure Synthesis and Single‐Crystal Structure Elucidation of the Indium Oxide‐Borate In4O2B2O7

“…Through these cationic OIn 4 coordination polyhedra, the structure pertains to the family of also naturally occurring oxo‐compounds represented by e.g. rare‐earth oxide‐silicates, lead oxide‐selenides, and oxide‐bromides, or numerous oxide‐phosphates . The first oxide‐borates were reported in the 1980s, followed by a first structure description of the substance class with K 2 Ga 2 O(BO 3 ) 2 in 1997 .…”