The crystal structures of two non-metal tricyanomelaminates:: Diammonium tricyanomelaminate dihydrate [NH4]2[C6N9H] • 2 H2O and dimelaminium tricyanomelaminate melamine dihydrate [C3N6H7]2[C6N9H] • C3N6H6 • 2 H2O

被引：12
|
作者：
Lotsch, Bettina V. [1 ]
Schnick, Wolfgang [1 ]
机构：
[1] Univ Munich, Dept Chem & Biochem, Munich, Germany
来源：
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2007年 / 633卷 / 09期
关键词：
tricyanomelaminates; crystal structure; disorder;
D O I：
10.1002/zaac.200700147
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Diammonium tricyanomelaminate dihydrate [NH4](2)[C6N9H] center dot 2 H2O (1) and dimelaminium tricyanomelaminate melamine dihydrate [C3N6H7](2)[C6N9H] center dot C3N6H6 center dot 2 H2O (2) were obtained by metathesis reactions from Na-3[C6N9] in aqueous solution and characterized by single-crystal X-ray diffraction and N-15 solid-state NMR spectroscopy (1). Both salts contain mono-protonated tricyanomelaminate (TCM) anions and crystallize as dihydrates. Considering charge balance requirements, the crystal structure of I (C2/c, a = 3181.8(6) pm, b = 360.01(7) pm, c = 2190.4(4) pm, beta = 112.39(3)degrees, V = 2319.9(8) 10(6). pm(3)) can best be described by assuming a random distribution of an ammonium ion - crystal water pair over two energetically similar sites. Apart from two melaminium cations, 2 (P2(1)/c, a = 674.7(5) pm, b = 1123.6(5) pm, e = 3400.2(5) pm, beta = 95.398(5), V = 2566(2) 10(6) pm(3)) contains one neutral melamine per formula unit acting as an additional "solvent" molecule and yielding a donor-acceptor type of pi-stacking interaction.
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页码：1435 / 1441
页数：7
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