| | 1 | Author
| Reinhard Nesper, Jan Curda | Requires cookie* | | | Title
| das erste Chalcogenid mit zweiwertigem Aluminium Al 7 Te 10 — the First Chalcogenide of Divalent Aluminum  | | | | Abstract
| Al 7 Te 10 is prepared from a melt of the elements in stoichiometric amounts in a corundum crucible contained in a sealed quartz ampoule. The ruby red cube shaped crystals are stable below 840 K. The structure of Al 7 Te, 0 (R32-D^; a = 1439.5 pm, c = 1793.2 pm, Z = 6, R = 0.03) is a distorted defect variant of a tetrahedral arrangement of the 4H-polytype. The central unit, a double barrelane [Te 4 Al 4 —Al 4 Te 4 ], contains an Al —Al bond of 260 pm, which is somewhat longer (n = 0.83) than an expected single bond (250 pm, n = 1). This homopolar bond disturbs the electrostatically favorable (Al—Te—)" sequence in the structure which is compensated by the occurrence of four-membered Al 2 Te 2 rings. Al 7 Te 10 is a Zintl phase according to l/2{[Al 2+ -Al 2+ ][Al 3+ ] !2 [Te 2 ~] 20 } and exhibits semiconducting and diamagnetic behaviour. | | | |
Reference
| Z. Naturforsch. 42b, 557 (1987); eingegangen am 9. Dezember 1986 | | | |
Published
| 1987 | | | |
Keywords
| Synthesis, Crystal Structure, Divalent Aluminum, Aluminum-Aluminum Bonds | | | |
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| default:Reihe_B/42/ZNB-1987-42b-0557.pdf | | | | Identifier
| ZNB-1987-42b-0557 | | | | Volume
| 42 | |
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