Trimerization of dicyanamide ions C2N3- in the solid -: Syntheses, crystal structures, and properties of NaCs2(C2N3)3 and Na3C6N9•3H2O

被引：0

作者：

Jurgens, B ^{[1
]}

Milius, W ^{[1
]}

Morys, P ^{[1
]}

Schnick, W ^{[1
]}

机构：

[1] Univ Bayreuth, Anorgan Chem Lab, D-95440 Bayreuth, Germany

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 1998年 / 624卷 / 01期

关键词：

carbon(IV) nitrides; dicyanamide; tricyanomelaminate; trimerization; crystal structure; IR spectroscopy;

D O I：

暂无

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The Tricyanomelaminate Na3C6N9 . 3H(2)O is obtained by heating NaC2N3 to 500 degrees C and subsequent crystallization from water. According to the single-crystal structure determination (Na3C6N9 . 3H(2)O: P62c; a = 1023.53(8), c = 650.85(15) pm, Z = 2, R1 = 0.0276, wR2 = 0.0710) in the solid cyclic C6N93- ions occur. Partial ion exchange and crystallization from water yields anhydrous NaCs2(C2N3)(3). The X-ray structure determination (NaCs2(C2N3)3: P6(3)/m, a = 700.01(4), c = 1449.29(7) pm, Z = 2, R1 = 0.0173, wR2 = 0.0432) reveals C2N3-ions in the solid. Calorimetric investigations and detailed IR spectroscopy of NaC2N3, Na3C6N9, Na3C6N9 . 3 H2O, as well as NaCs2(C2N3)(3) reveal in combination with the structure analyses that NaC2N3 transforms to Na3C6N9 above 380 degrees C by trimerization of the C2N3- ions in the solid. Above 180 degrees C the hydrate Na3C6N9 . 3H(2)O reversibly dehydrates.

引用

页码：91 / 97

页数：7

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