|
Promethium(III) Iodide
Promethium(III) iodide is an inorganic compound, with the chemical formula of PmI3. It is a red radioactive solid with a melting point of 695 °C. Preparation Promethium(III) iodide is obtained by reacting anhydrous hydrogen iodide and promethium(III) chloride at a high temperature: : PmCl3 + 3 HI → PmI3 + 3 HCl From the reaction of a HI-H2 mixture and promethium oxide (Pm2O3), promethium(III) iodide cannot be produced, and only promethium oxyiodide (PmOI) can be obtained. Promethium oxide reacts with molten aluminum iodide Aluminium iodide is a chemical compound containing aluminium and iodine. Invariably, the name refers to a compound of the composition , formed by the reaction of aluminium and iodine or the action of on metal. The hexahydrate is obtained fr ... at 500 °C to form promethium iodide. more complete reference required References Iodides Promethium compounds Lanthanide halides {{Metal-halide-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Promethium(III) Fluoride
Promethium(III) fluoride or promethium trifluoride is a salt of promethium and fluorine with the formula PmF3. Promethium(III) fluoride is sparingly soluble in water. It reacts with metallic lithium to yield lithium fluoride Lithium fluoride is an inorganic compound with the chemical formula LiF. It is a colorless solid that transitions to white with decreasing crystal size. Its structure is analogous to that of sodium chloride, but it is much less soluble in water. ... and metallic promethium: : References Promethium compounds Fluorides Lanthanide halides {{Metal-halide-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Promethium(III) Chloride
Promethium(III) chloride is a chemical compound of promethium and chlorine with the formula PmCl3. It is an ionic, water soluble, crystalline salt that glows in the dark with a pale blue or green light due to promethium's intense radioactivity. Preparation Promethium(III) chloride is obtained from promethium(III) oxide by heating it in a stream of dry HCl at 580 °C. Properties Promethium(III) chloride is a purple solid with a melting point of 655 °C. It crystallizes in the hexagonal crystal system (NdCl3 type) with the lattice parameters ''a'' = 739 pm and ''c'' = 421 pm with two formula units per unit cell and thus a calculated density of 4.19 g·cm−3.Weigel: ''Die Chemie des Promethiums'', p. 588–589.''Gmelins Handbuch der anorganischen Chemie'', System No. 39, p. 181. When PmCl3 is heated in the presence of H2O, the pale pink colored promethium(III) oxychloride (PmOCl) is obtained.''Gmelins Handbuch der anorganischen Chemie'', System No. 39 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Promethium(III) Bromide
Promethium(III) bromide is an inorganic compound, with the chemical formula of PmBr3. It is radioactive salt. It is a crystal of the hexagonal crystal system, with the space group of P63/mc (No. 176). Preparation Promethium(III) bromide can be obtained by reacting hydrogen bromide and promethium(III) oxide Promethium(III) oxide is a compound with the formula Pm2O3. It is the most common form of promethium. Crystal structure Promethium oxide exists in three major crystalline forms: *a, b and c are lattice parameters, Z is the number of formula ...: : Pm2O3 + 6 HBr —500°C→ 2 PmBr3 + 3 H2O Promethium(III) bromide hydrate cannot be heated to form its anhydrous form. Instead it decomposes in water to form promethium oxybromide: : PmBr3 + H2O(g) → PmOBr + 2 HBr References {{Lanthanide halides category:Bromides category:Promethium compounds Lanthanide halides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neodymium(III) Iodide
Neodymium(III) iodide is an inorganic salt of iodine and neodymium with the formula NdI3.Ezhov, Y.S., Komarov, S.A. & Sevast’yanov, V.G. Refinement of molecular constants of neodymium triiodide by electron diffraction. ''J Struct Chem ''41, 593–596 (2000). https://doi.org/10.1007/BF02683920 Neodymium uses the +3 oxidation state in the compound. The anhydrous compound is a green powdery solid at room temperature. Preparation Heating neodymium and iodine in an inert atmosphere produces this salt: : 2 Nd + 3 I2 → 2 NdI3 It can also be prepared by the reaction of neodymium(III) oxide and hydroiodic acid to make a hydrate: : Nd2O3 + 6 HI → 2 NdI3 + 3 H2O The anhydrate can then be obtained by heating the nonahydrate with ammonium iodide: : NdI3 • 9 H2O + nNH4I → NdI3 + nNH3 + nHI + 9H2O Physical properties Neodymium(III) iodide forms green, water-soluble hygroscopy, hygroscopic crystal, crystals. It has a melting point of 784°C. It forms a nonahydrate crystal NdI3.9H2O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
