Structure cristalline du sulfate acide d'indium(III) hydraté

Abstract

AbstraetThe compound is orthorhombic. The unit cell, with a = 9.997 (3), b = 5.477 (2), c = 18.443 (10) A, contains four formula units, arm = 2.48; d x = 2.50 Mg m-3; /~(Mo Ka) = 2.78 mm -1. The crystal structure has been solved in space group Pnam from single-crystal data collected on an automated diffractometer by Patterson and Fourier syntheses and refined by least-squares methods. With anisotropic temperature factors, the final R value is 0.033 for 783 independent observed reflexions corrected for absorption effects. The crystal structure can be described in terms of layers perpen-0567-7408/79/071580-04501.00 dicular to the c axis consisting of indium atoms joined to four others by SO 4 groups. The coordination polyhedron around the indium atoms is completed by the water molecules forming an InO4(OH2) 2 distorted octahedron. These layers are linked together by oxonium ions. One H502 + joins two sheets by the intermediary of short hydrogen bonds. In view of these results, the compound must be formulated as (HsO2)+[In(H20)2 -(SO4)2]-and named: diaquadisulfatoindic(III) acid dihydrate.This conclusion can be extended to acids HM(SO4) 2. 4HzO with M = AI, Ga, TI, V, Fe and Ti.

Formation Principles for Vanadium Selenites: The Role of pH on Product Composition

“…The [VO(SeO 3 ) 2 ] n 2 n – layers in 2 are similar to those observed in (H 3 NCH 2 CH 2 NH 3 )[VO(SeO 3 ) 2 ], a related phase containing ethylenediammonium cations . Additional analogues are found in both organically templated compounds and inorganic phases. − Compound 2 exists as an inversion twin, in which the [( R )-2-mpipH 2 ] 2+ and [( S )-2-mpipH 2 ] 2+ cations are segregated into domains within each crystal. The Hirshfeld-I scheme ,, was used to determine partial atomic charges for all atoms; a complete table of partial atomic charges for 2 is available in the Supporting Information.…”

Solvothermal synthesis of K2V3O8 nanorods

“…is a member of the A 2 V 3 O 8 (A=K, Rb, Tl and NH 4 ) family [1][2][3][4][5] which are low-dimensional quantum antiferromagnets. These fresnoitetype layered vanadates have attracted much attention due to their novel low-temperature magnetic properties [1,[6][7][8].…”

“…Because there are two valence states (V 5+ and V 4+ ) of vanadium coexisting in this compound, it is difficult to synthesize K 2 V 3 O 8 by conventional solid-state reaction method. Conventionally single crystals of K 2 V 3 O 8 were formed in a platinum crucible sealed inside a silica container by cooling appropriate amounts of VO 4 in a molten KVO 3 to synthesize polycrystalline K 2 V 3 O 8 via reacting KVO 3 , V 2 O 3 and V 2 O 5 in a sealed tube at 550 C. The above methods are complicated and cost a lot, and are usually faced with difficulty to control the homogeneity and particle size of the final products. Solvothermal method is one of the most promising solution chemical routes for materials preparation.…”