Show/Hide Menu
Hide/Show Apps
anonymousUser
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Açık Bilim Politikası
Açık Bilim Politikası
Frequently Asked Questions
Frequently Asked Questions
Browse
Browse
By Issue Date
By Issue Date
Authors
Authors
Titles
Titles
Subjects
Subjects
Communities & Collections
Communities & Collections
Na12Ge17: A compound with the zintl anions [Ge-4](4-) and [Ge-9](4-) - Synthesis, crystal structure, and Raman spectrum
Date
2003-04-01
Author
CARRILLO-CABRERA, W
GIL, RC
SOMER, M
Persil Çetinkol, Özgül
VON SCHNERING, HG
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
4
views
0
downloads
Na12Ge17 is prepared from the elements at 1025 K in sealed niobium ampoules. The crystal structure reinvestigation reveals a doubling of the unit cell (space group:P2(1)/c; a = 22.117(3) Angstrom, b = 12.803(3) Angstrom, c = 41.557(6) Angstrom, beta = 91.31(2)degrees, Z = 16; Pearson code: mP464), furthermore, weak superstructure reflections indicate an even larger C-centred monoclinic cell. The characteristic structural units are the isolated cluster anions [Ge-9](4-) and [Ge-4](4-) in ratio 1:2, respectively The crystal structure represents a hierarchical cluster replacement structure of the hexagonal Laves phase MgZn2 in which the Mg and Zn atoms are replaced by the Ge-9 and Ge-4 units, respectively The Raman spectrum of Na12Ge17 exhibits the characteristic breathing modes of the constituent cluster anions at v = 274 cm(-1) ([Ge-9](4-)) and v = 222 cm(-1) ([Ge-4](4-)) which may be used for identification of these clusters in solid phases and in solutions. Raman spectra further prove that Na12Ge17 is partial soluble both in ethylenediamine and liquid ammonia. The solution and the solid extract contain solely [Ge-9](4-). The remaining insoluble residue is Na4Ge4. By heating the solvate Na4Ge9(NH3)(n) releases NH3 and decomposes irreversibly at 742 K, yielding Na12Ge17 and Ge.
Subject Keywords
Inorganic Chemistry
URI
https://hdl.handle.net/11511/48243
Journal
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
DOI
https://doi.org/10.1002/zaac.200390102
Collections
Department of Chemistry, Article