Joseph, Stefanie and Suchentrunk, Christof and Korber, Nikolaus (2010) Dissolving Silicides: Syntheses and Crystal Structures of New Ammoniates Containing Si-5(2-) and Si-9(4-) Polyanions and the Role of Ammonia of Crystallisation. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 65 (9). pp. 1059-1065. ISSN 0932-0776,
Full text not available from this repository.Abstract
The dissolution of the ternary material K6Rb6Si17 in liquid ammonia yields the solvate corn pound Rb4Si9 5NH(3), which contains fourfold negatively charged nine atom silicon clusters Si-9(4-) Using additionally the [2 2 2] cryptand during the dissolution results in the solvate [K(2 2 2-crypt)](2)Si-5 4NH(3) in which the Si-5(2-) anion is present in the crystal structure The Si-5(2-) anion has the shape of a nearly ideal trigonal bipyramid The starting material K6Rb6Si17 contains both Si-4(4-) and Si-9(4-) Zintl anions In ammoniate crystal structures Si-9(4-) anions are accessible independently of Si-4(4-) anions and ammonia of crystallisation plays a major role in the observed crystal symmetry For the cryptate structures of Si-5(2-) and Ge-5(2-) anions ammonia of crystallisation is obligatory despite the loss of crystal symmetry compared to the crystal structures of the heavier homologues Pb-5(2-) and Sn-5(2-)
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ALKALIMETALLE ZU HALBMETALLEN; DELTAHEDRAL ZINTL IONS; GERMANIUM CLUSTERS; SILICON CLUSTERS; RAMAN-SPECTRUM; DAS VERHALTEN; ANIONS; CHEMISTRY; ATOMS; DIMER; Silicides; Zintl Anions; Liquid Ammonia; Crystal Structure Determination |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Arbeitskreis Prof. Dr. Nikolaus Korber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2020 09:11 |
| Last Modified: | 15 Jul 2020 09:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24305 |
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