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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 10
BKCSDE 26(10)
October 20, 2005 

Synthesis and Structure of Sr6Ge5N2 and Ba6Ge5N2
Dong Gon Park*, Zoltan A. Gal, Francis J. DiSalvo
Strontium germanium nitride, Barium germanium nitride, Zintl anion
Two isostructural new alkaline earth germanium nitrides, Sr6Ge5N2 and Ba6Ge5N2, were obtained as single crystals from constituent elements in molten Na. They both crystallize in space group Pmmn (No. 59) with a = 4.0007(8), b = 17.954(3), c = 9.089(2) A, Z = 2, and a = 4.1620(2), b = 18.841(1), c = 9.6116(5) A, Z = 2, for Sr6Ge5N2 and Ba6Ge5N2, respectively. Their crystal structure contains features for both Zintl and nitride phases: zigzag anionic chain of Ge2-, and dumbbell-shaped bent anion of GeN24-. Counter cations of Sr or Ba wrap these anionic units in a channel-like arrangement. Unlike in other germanium nitrides, bond lengths of both Ge-N arms of the GeN24-, are same in Sr6Ge5N2 and Ba6Ge5N2.
1543 - 1548
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