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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Crystal structure and dimorphism of silicon tetraisocyanate Si(NCO) _4
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Crystal structure and dimorphism of silicon tetraisocyanate Si(NCO) _4

机译:四异氰酸硅Si(NCO)_4的晶体结构和二态性

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Silicon tetraisocyanate Si(NCO) _4 was obtained by reacting SiCl _4 and AgNCO in boiling toluene. The colourless liquid was analyzed by Raman and NMR spectroscopy. Structural studies on solid Si(NCO) _4 (melting point: +26°C) have revealed it to exist in two polymorphic modifications. According to the results of single-crystal X-ray diffraction, at T = -173°C, α-Si(NCO) _4 exhibits triclinic symmetry (P$ar{1}$; a = 10.05(5), b = 10.50(2), c = 14.32(1) ?, α = 91.62(1)°, β = 92, 32(1)°, γ = 99.68(1)°; V = 1488.56(3) ? 3; Z = 8). Above T = -33°C, a monoclinic phase evolves, β-Si(NCO) _4 (P2 _1/c; a = 10.78(3), b = 7.11(1), c = 10.27(5) ?, β = 99, 06(9)°; V = 777.39(1) ? ~3; Z = 4). The charge distribution was studied for both polymorphs. In the solid state, Si(NCO) _4 is a tetrahedral molecule with the Si-N=C=O linkages bent at the nitrogen atoms.
机译:通过使SiCl 4和AgNCO在沸腾的甲苯中反应获得四异氰酸硅Si(NCO)4。通过拉曼和NMR光谱分析无色液体。对固态Si(NCO)_4(熔点:+ 26°C)的结构研究表明,它以两种多晶型形式存在。根据单晶X射线衍射的结果,在T = -173°C时,α-Si(NCO)_4表现出三斜对称性(P $ bar {1} $; a = 10.05(5),b = 10.50(2),c = 14.32(1)α,α= 91.62(1)°,β= 92,32(1)°,γ= 99.68(1)°; V = 1488.56(3)α3; Z = 8)。在T = -33°C以上时,出现单斜晶相,β-Si(NCO)_4(P2 _1 / c; a = 10.78(3),b = 7.11(1),c = 10.27(5)α,β= 99,06(9)°; V = 777.39(1)≤〜3; Z = 4)。研究了两种多晶型物的电荷分布。在固态下,Si(NCO)_4是四面体分子,其Si-N = C = O键在氮原子处弯曲。

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