New calcium germanium nitrides:: Ca2GeN2, Ca4GeN4, and Ca5Ge2N6

被引：34

作者：

Clarke, SJ ^{[1
]}

DiSalvo, FJ ^{[1
]}

机构：

[1] Cornell Univ, Dept Chem, Baker Lab, Ithaca, NY 14853 USA

来源：

INORGANIC CHEMISTRY | 2000年 / 39卷 / 12期

关键词：

D O I：

10.1021/ic991427d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We report three new calcium germanium nitrides synthesized as crystals from the elements in sealed niobium tubes at 760 degrees C using liquid sodium as a growth medium. Black Ca2GeN2 is isostructural with the previously reported strontium analogue. It is tetragonal P4(2)/mbc (no. 135) with a = 11.2004(8) Angstrom, c = 5.0482(6) Angstrom, and Z = 8. It contains GeN24- units which have 18 valence electrons, and consequently are bent, like the isoelectronic molecule SO2. In contrast, clear, orange Ca4GeN4 with fully oxidized germanium contains isolated GeN48- tetrahedra and is monoclinic P2(1)/c (no. 14) with a = 9.2823(8) Angstrom, b = 6.0429(5) Angstrom, c = 11.1612(9) Angstrom, beta = 116.498(6)degrees, and Z = 4. Clear, colorless Ca5Ge2N6, also with fully oxidized germanium, contains infinite chains, (1)(infinity)[GeN2N2/25-], of corner-sharing tetrahedra similar to those found in pyroxenes. However, the precise structure of this latter phase has not yet been determined because of twinning problems.

引用

页码：2631 / 2634

页数：4

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