Li4Ca3Si2N6 and Li4Sr3Si2N6 - Quaternary Lithium Nitridosilicates with Isolated [Si2N6]10- Ions

被引：28

作者：

Pagano, Sandro ^{[1
]}

Lupart, Saskia ^{[1
]}

Schmiechen, Sebastian ^{[1
]}

Schnick, Wolfgang ^{[1
]}

机构：

[1] Univ Munich, Dept Chem, Lehrstuhl Anorgan Feskorperchem, D-81377 Munich, Germany

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2010年 / 636卷 / 11期

关键词：

Lithium; Fluxing agent; Strontium; Nitridosilicates; X-ray diffraction; CRYSTAL-STRUCTURE; SILICON-NITRIDE;

D O I：

10.1002/zaac.201000163

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The isotypic nitridosilicates Li4Ca3Si2N6 and Li4Sr3Si2N6 were synthesized by reaction of strontium or calcium with Si(NH)(2) and additional excess of Li3N in weld shut tantalum ampoules. The crystal structure, which has been solved by single-crystal X-ray diffraction (Li4Sr3Si2N6: C2/m, Z = 2, a = 6.1268(12), b = 9.6866(19), c = 6.2200(12) angstrom, beta = 90.24(3)degrees, wR(2) = 0.0903) is made up from isolated [Si2N6](10-) ions and is isotypic to Li4Sr3Ge2N6. The bonding angels and distances within the edge-sharing [Si2N6](10-) double-tetrahedra are strongly dependent on the lewis acidity of the counterions. This finding is discussed in relation to the compounds Ca5Si2N6 and Ba5Si2N6, which also exhibit isolated [Si2N6](10-) ions.

引用

页码：1907 / 1909

页数：3

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