Lorenz, Corinna and Hastreiter, Florian and Hioe, Johnny and Lokesh, N. and Gaertner, Stefanie and Korber, Nikolaus and Gschwind, Ruth M. (2018) The Structure of [HSi9](3-) in the Solid State and Its Unexpected Highly Dynamic Behavior in Solution. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 57 (39). pp. 12956-12960. ISSN 1433-7851, 1521-3773
Full text not available from this repository. (Request a copy)Abstract
We report on the first unambiguous detection of the elusive [HSi9](3-) anion in solutions of liquid ammonia by various Si-29 and H-1 NMR experiments including chemical exchange saturation transfer (CEST). The characteristic multiplicity patterns of both the Si-29 and H-1 resonances together with CEST and a partially reduced H-1,Si-29 coupling constant indicate the presence of a highly dynamic Si-8 entity and a Si-H moiety with slow proton hopping. Theoretical calculations corroborate both reorganization of Si-8 on the picosecond timescale via low vibrational modes and proton hopping. In addition, in a single-crystal X-ray study of (K(DB[18]crown-6))(K([2.2.2]crypt))(2)[HSi9]center dot 8.5 NH3, the Hatom was unequivocally localized at one vertex of the basal square of the monocapped square-antiprismatic cluster. Thus experimental studies and theoretical considerations provide unprecedented insight into both the structure and the dynamic behavior of these cluster anions, which hitherto had been considered to be rigid.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SILICON CLUSTERS; LIQUID-AMMONIA; ZINTL IONS; CHEMICAL-EXCHANGE; CRYSTAL-STRUCTURE; SI NANOCLUSTERS; ANION; SN-4(4-); SI-4(4-); SN; Si-29 NMR spectroscopy; CEST; silicides; X-ray diffraction; Zintl anions |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Arbeitskreis Prof. Dr. Nikolaus Korber Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. Ruth Gschwind |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Dec 2019 13:03 |
| Last Modified: | 12 Dec 2019 13:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13831 |
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