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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.
| Column 1 | Column 2 |
|---|---|
| Glowing powder mixture of promethium(III) chloride and zinc sulfide | |
| Crystal structure | |
| Other names | |
| Promethium chloride; Promethium trichloride | |
| CAS Number | .mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}13779-10-7 |
| 3D model (JSmol) | Interactive image |
| ChemSpider | 14296263 |
| ECHA InfoCard | 100.034.004 |
| EC Number | 237-420-0 |
| PubChem CID | 14475784 |
| InChI | |
| InChI=1S/3ClH.Pm/h3*1H;/q;;;+3/p-3Key: KAKNBYVEBALXNX-UHFFFAOYSA-K | |
| SMILES | |
| [Cl-].[Cl-].[Cl-].[Pm+3] | |
| Chemical formula | Cl3Pm |
| Molar mass | 251 g·mol−1 |
| Appearance | purple solidyellow solid |
| Density | 4.19 g/cm3 (calc., XRD) |
| Melting point | 655 °C (1,211 °F; 928 K) |
| Crystal structure | Trigonal, hP8 |
| Space group | P63/m, No. 176 |
| Other anions | Promethium(III) oxide |
| Other cations | Neodymium(III) chloride, Samarium(III) chloride |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Infobox references | |
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.
Promethium(III) chloride is obtained from promethium(III) oxide by heating it in a stream of dry HCl at 580 °C.
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. When PmCl3 is heated in the presence of H2O, the pale pink colored promethium(III) oxychloride (PmOCl) is obtained.
Promethium(III) chloride (with 147Pm) has been used to generate long-lasting glow in signal lights and buttons. This application relied on the unstable nature of promethium, which emitted beta radiation (electrons) with a half-life of several years. The electrons were absorbed by a phosphor, generating visible glow. Unlike many other radioactive nuclides, promethium-147 does not emit alpha particles that would degrade the phosphor.
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