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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Two Light-Metal Dihydrogenisocyanurate Hydrates Linked by Diagonal Relationship: Syntheses, Crystal Structures, and Vibrational Spectra of Li[H_2N_3C_3O_3]·1.75 H_2O and Mg[H_2N_3C_3O_3]_2·8 H_2O
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Two Light-Metal Dihydrogenisocyanurate Hydrates Linked by Diagonal Relationship: Syntheses, Crystal Structures, and Vibrational Spectra of Li[H_2N_3C_3O_3]·1.75 H_2O and Mg[H_2N_3C_3O_3]_2·8 H_2O

机译:通过对角线关系连接的两个轻金属二氢氰脲酸酯水合物:Li [H_2N_3C_3O_3]的合成,晶体结构和振动光谱·1.75 H_2O和MG [H_2N_3C_3O_3] _2·8 H_2O

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摘要

Single-crystalline materials of Li[H_2N_3C_3O_3]·1.75 H_2O and Mg[H_2N_3C_3O_3]_2·8 H_2O were obtained by dissolving stoichiometric amounts of the respective carbonates with cyanuric acid in boiling water followed by gentle evaporation of excess water after cooling to room temperature. Even though both of these compounds crystallize in the triclinic space group P1-bar according to X-ray structure analyses of their colorless and transparent single crystals, they adopt two new different structure types. Li[H_2N_3C_3O_3]·1.75 H_2O exhibits the unit-cell parameters a = 884.71(6) pm, b = 905.12(7) pm, c = 964.38(7) pm, α = 67.847(2)°, β = 6_2.904(2)° and γ = 68.565(2)° (Z = 4), whereas the lattice parameters for Mg[H_2N_3C_3O_3]_2·8 H_2O are a = 691.95(5) pm, b = 1055.06(8) pm, c = 1183.87(9) pm, α = 85.652(2)°, β = 83.439(2)° and γ = 79.814(2)° (Z = 2). In both cases, the singly deprotonated isocyanuric acid forms monovalent anions consisting of cyclic [H_2N_3C_3O_3]~- units, which are arranged in ribbons typical for most hitherto known monobasic isocyanurate hydrates. The structures are governed by the oxophilic strength of the respective cation which means that they fulfil their oxophilic coordination requirements either solely with water molecules ([Mg(OH_2)_6]~(2+) for Mg~(2+)) or with crystal water and one or two direct coordinative contacts to carbonyl oxygen atoms (O_((cy))) of [H_2N_3C_3O_3]~- anions ([(Li(OH_2)_(2-3)(O_((cy)1-2)]~+ for Li~+). In both structures occur dominant hydrogen bonds N-H···O within the anionic [H_2N_3C_3O_3]~- ribbons as well as hydrogen bonds O-H···O between these ribbons and the hydrated Li~+ and Mg~(2+) cations.
机译:Li[H_2N_3C_3O_3]·1.75 H_2O和Mg[H_2N_3C_3O_3]·2.8 H_2O单晶材料是通过在沸水中用三聚氰酸溶解化学计量的相应碳酸盐,然后在冷却至室温后将多余的水温和蒸发而获得的。尽管根据无色透明单晶的X射线结构分析,这两种化合物都在三斜空间群P1 bar中结晶,但它们采用了两种新的不同结构类型。1.75 H_2O展示了单位细胞参数a=884.71(6)pm,b=905.12(7)pm,c=964.38(7)pm,c=964.38(7)pm,7(7)pm,c=964.38(7)pm,7(7)pm,c=964.38(7)pm,α=67.847(2),α=67.847(2),α=7(2)7(2)7(2),2(2(2)10),β=6(2.847(2(2)2)10)和2(2)和2(2)2(2)和γ(2)和γ=68.565(2)5(2)和γ=68.565(2)2)(2)(2)(4)(2)(2)(2)(Z=4)(4)(4)(4)(4)(4)4)4)4)(4)(4)8.565)(4)4)4)8 2)°和γ=79.814(2)°(Z=2)。在这两种情况下,单独去质子化的异氰尿酸形成由环状[H_2N_3C_3O_3]~-单元组成的一价阴离子,这些单元以带状排列,这是迄今为止已知的大多数一元异氰尿酸水合物的典型特征。这些结构由相应阳离子的亲氧强度决定,这意味着它们可以单独与水分子([Mg(OH_2)_6]~(2+)对于Mg~(2+))或晶体水以及与[H_2N_3C_3O_3]~-阴离子([Li(OH_2)_(2-3)(O_(cy)1-2])的羰基氧原子(O_((cy))的一个或两个直接配位接触来满足其亲氧配位要求。在这两种结构中,负离子[H_2N_3C_3O_3]~-带内存在主要的氢键N-H··O,以及这些带与水合Li~+和Mg~(2+)阳离子之间的氢键O-H··O。

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