| | 1 | Author
| D. Babel | Requires cookie* | | | Title
| Die Kristallstruktur des Cyano-Elpasoliths [N(CH3)4]2CsFe(CN)6 The Crystal Structure of the Cyano Elpasolite [N(CH3)4]2CsFe(CN)6  | | | | Abstract
| The crystal structure of the cubic compound [N(CH3)4]2CsFe(CN)6 was determined by X-ray methods: a = 2527.4(6) pm, space group Fd3c, Z = 32, Rg = 0.028 (260 independent single crystal reflections). The resulting distances within the practically undistorted Fe (CN) 6 3 ~ -octahedron are Fe-C = 193.4(6) and C-N = 115.7(7) pm. Compared to the ideal elpasolite structure of space group Fm3m, Z = 4, the octahedra are rotated by 7.4° through their 3 axis. This is discussed as caused by steric requirements of the tetramethyl-ammonium groups (N-C = 148.4(10) and 149.1(38) pm, resp.). Three quarters of them, of which also the hydrogen positions could bo located, are well oriented. The remaining quarter shows orientational disorder to approach similar contact distances as the other N(CH3)4+ ion exhibits between the methyl groups and the nitrogen ends of the anions. | | | |
Reference
| Z. Naturforsch. 37b, 1534—1539 (1982); eingegangen am 11. August 1982 | | | |
Published
| 1982 | | | |
Keywords
| Crystal Structure, Elpasolite, Hexacyanoferrate(III) | | | |
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| default:Reihe_B/37/ZNB-1982-37b-1534.pdf | | | | Identifier
| ZNB-1982-37b-1534 | | | | Volume
| 37 | |
| 2 | Author
| M. Witzei, D. Babel | Requires cookie* | | | Title
| Die Kristallstruktur des elpasolith-verwandten Cyanokomplexes [N(CH3)4]2NaFe(CN)6 * H20 The Crystal Structure of the Elpasolite-Related Cyano Complex [N(CH3)4]2NaFe(CN)6 * H20 | | | | Abstract
| The compound [N(CH3)4]2NaFe(CN)6 • H20 crystallizes in the orthorhombic space group Pnma, Z = 4, a — 1863.9(2), b = 861.7(1), c — 1317.2(2) pm. The X-ray single crystal structure determination (2515 reflections, R — 0.04) revealed an elpasolite-related framework of slightly deformed Fe(CN)63_ octahedra, the mean distances in which are Fe —C = 194.0 and C—N = 113.9 pm. The strongly distorted octahedral N6 cavities formed by six Fe(CN)63_ units are occupied by monohydrated sodium ions, exhibiting a very short distance N a—O = 221.8(3) pm. By approach to one of the octahedral faces within their N6 environment the sodium ions obtain a distorted tetrahedral NaON3 coordination, N a—N = 2 x 238.0(3) and 241.3(3) pm. One of the compound's two tetramethylammonium ions, which are centered at mirror planes, is orientation-ally disordered. The reason for this is discussed. | | | |
Reference
| Z. Naturforsch. 39b, 201 (1984); eingegangen am 21. Juli/19. Oktober 1983 | | | |
Published
| 1984 | | | |
Keywords
| Crystal Structure, Elpasolite, Hexacyanoferrate(III), Monohydrated Sodium Ion | | | |
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| 39 | |
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