Synthesis, Structure and Theoretical Calculation of Imidazolium 3,5-Dinitrobenzoate

The title adduct imidazolium 3,5-dinitrobenzoate has been synthesized in aqueous solution and characterized by elemental analyses, IR spectrum and X-ray crystallography. The title compound belongs to monoclinic, space group P21/n with a = 7.5540（9）, b = 21.333（2）, c = 7.7823（9）A, β = 102.741（2）^o, C10H8N4O6, Mr = 280.20, V= 1223.3（2）A^3, Z = 4, Dc = 1.521 g/cm^3, F（000） = 576, p = 0.129 mm^-1, the final R = 0.0433 and wR = 0.1092 for 2001 observed reflections with I 〉 2a（I）. The structural analysis indicates the component ions are linked by N-H...O hydrogen bonds into an infinite one-dimensional C2^2 （8） chain parallel to the [1 0 -1] direction. Moreover, the theoretical investigations of the title compound with HF/6-31G（d） method were performed, and its stability, frontier molecular orbital composition and Mulliken charge distribution were also discussed.

Crystal Structure of Dimethylamine 3,5-Dinitrobenzoic Acid Organic Adduct

The title adduct （C9H11N3O6, Mr= 257.21） was synthesized and it crystallizes in orthorhombic, space group P212121 with a = 5.8835（19）, b =9.517（3）, c = 20.399（6） A, V= 1142.2（6） ,A^3 Z = 4, Dc= 1.496 g/cm^3, F（000） = 536,μ（MoKα） = 0.128 mm^-1, the final R = 0.0396 and wR = 0.0800 for 1047 observed reflections with I 〉 2σ（I）. The compound is a 1：1 adduct of dimethylamine and 3,5-dinitrobenzoic acid which are linked by hydrogen bonds to form a two-dimensional network. The dimethylamine is protonated at the nitrogen atom with the proton from the carboxyl of 3,5- dinitrobenzoic acid.

Synthesis and Crystal Structure of a Novel Organic Adduct Nonlinear Optical Material: 3,5-Dinitrobenzonic Acid·ethanolamine (3,5-DNBEA)

The title compound （C2H7NO·C7H4N2O6） has been obtained by the reaction of ethanolamine with 3,5-dinitrobenzoic acid in deionized water at room temperature. The crystal crystallizes in orthorhombic, space group P212121 with a = 6.048（2）, b = 9.146（3）, c = 21.955（7） A^°, C9H11N3O7, Mr = 273.21, Z = 4, V= 1214.3（7） , A^°3, Dc = 1.494 g/cm^3, F（000） = 568,μ（MoKα） = 0.131 mm^-1, R1 = 0.0338 and wR2 = 0.0497. The new organic adduct is composed of one ethanolamine and one 3,5-dinitrobenzoic acid, which are linked up by O-H…O and N-H…O types of hydrogen bonds to form a nine-membered ring and an eleven-membered ring, extending into a one-dimensional network structure.

Crystal Structure of Nicotinic Acid·3,5-dinitrobenzoic Acid Organic Adduct

The title compound nicotinic acid3,5-dinitrobenzoic acid (NDNT) has been obtained by the reaction of nicotinic acid with 3,5-dinitrobenzoic acid in deionic water at room temperature. The crystal is of monoclinic, space group P21/n with a = 14.053(6), b = 5.046(2), c = 20.105(8) ? ?= 103.573(8)? C13H9N3O8, Mr = 335.23, Z = 4, V = 1385.8(10) 3, Dc = 1.607 g/cm3, (MoK? = 0.137 mm-1, F(000) = 688, R = 0.0435 and wR = 0.0993 for 1239 observed reflections (I > 2(I)). In the crystals, the asymmetric unit contains one nicotinic acid (C6H5NO2) and one 3,5- dinitrobenzoic acid (C7H4N2O6) molecules which are linked by some hydrogen bonds to form a twenty-membered hydrogen-bonded ring and an extended linear structure.

3,5-二硝基苯甲酸淀粉酯对肌酐的吸附机理

通过口服吸附剂在患者胃肠道内吸附肌酐以降低其浓度,对于延缓慢性肾衰进程有重要意义.以HN MR、13CNMR和UV Vis技术考察了肌酐与3,5 二硝基苯甲酸(DNBA)之间的络合反应机理,在此基础上,结合3,5 二硝基苯甲酸淀粉酯(DSt)对肌酐的吸附产物分析,推测了DSt对肌酐的吸附机理.结果表明,在碱性水溶液中,肌酐分子中的亚甲基易失去一个质子,并进攻DNBA的苯环,与其形成σ络合物;在微碱性的透析液中,DSt对肌酐的吸附主要是通过硝基苯环与肌酐之间形成σ络合物,络合机理与DNBA和肌酐之间的络合反应相似.

新型肌酐吸附剂的研究

以玉米淀粉和 3 ,5 二硝基苯甲酰氯为原料合成了一种新型肌酐吸附剂并采用红外光谱、元素分析、核磁共振等手段对产物化学结构进行了表征 ,考察了 3 ,5 二硝基苯甲酸淀粉酯对肌酐的静态吸附性能 ,建立了 3 ,5 二硝基苯甲酸与肌酐络合产物的结构模型 ,初步探索了 3 ,5 二硝基苯甲酸淀粉酯对肌酐吸附机理 .结果表明 ,3 ,5 二硝基苯甲酸淀粉酯对肌酐有较好的吸附性能 ,吸附在 4h内完成 ,吸附容量随 3 ,5 二硝基苯甲酸淀粉酯的取代度的增大而提高 ;在肌酐溶液浓度为 0～ 3 0 0mg·L- 1 ,吸附容量亦随肌酐浓度增大而提高 ;吸附温度从 1 9℃升高到 3 7℃时 ,吸附容量呈现降低的趋势 ;吸附容量随溶液pH值的增长呈现先增加后降低的趋势 ,在pH =8左右达到最大 ;在肌酐溶液浓度为 1 0 0mg·L- 1 、吸附温度为 3 7℃、介质pH =7的条件下 ,3 ,5 二硝基苯甲酸淀粉酯对肌酐的最大吸附量达 2 5mg·g- 1 .

新型淀粉衍生物的合成及其对肌酐的吸附研究

目的 制备新型肌酐吸附剂。方法 在非均相状态下以淀粉和 3,5 二硝基苯甲酰氯为原料合成了一种新的淀粉酯 3,5 二硝基苯甲酸淀粉酯 (starch 3,5 dinitrobenzoate)。用FTIR ,1 3CNMR和元素分析对产物结构进行了表征 ,考察了其对肌酐的吸附性能。结果 3,5 二硝基苯甲酸淀粉酯对肌酐的吸附在 4h内完成 ,吸附容量随 3,5 二硝基苯甲酸淀粉酯的取代度的增大而提高 ,在肌酐溶液质量浓度为 0～ 30 0mg·L- 1 ,吸附容量随肌酐质量浓度增大而提高 ;吸附温度从 19℃升高到 4 9℃时 ,吸附容量呈现先降低后增加的趋势 ,在 37℃时达到最低 ;吸附容量随溶液pH值的增长呈现先增加后降低的趋势 ,在pH 8时达到最大。在肌酐溶液质量浓度为 10 0mg·L- 1 、吸附温度为 37℃、介质pH 7的条件下 ,3,5 二硝基苯甲酸淀粉酯对肌酐的最大吸附量达 2 5mg·g- 1 。结论 3,5 二硝基苯甲酸淀粉酯对肌酐有较好的吸附性能 。

定西地区主栽马铃薯中还原糖和淀粉含量的比较研究

以定西地区9个主栽马铃薯品种为研究对象,对淀粉和还原糖含量分别采用旋光法和3,5-二硝基水杨酸比色法进行了分析测定。结果表明,不同品种的淀粉和还原糖含量差异很大,由于马铃薯所含成分的不同而有不同的用途,可将新大坪分为菜用型和淀粉加工型品种,陇薯3号、陇薯5号和陇薯6号分为淀粉加工型品种,定薯1号和陇薯4号分为淀粉加工型和薯条薯片加工型品种,黑美人为菜用型品种,大西洋和夏波蒂为薯条薯片加工型品种。

饲料中淀粉检测方法的研究

试验旨在建立一种操作简便、精确度高、重复性好的快速测定饲料中淀粉含量的方法。研究将糊化过的待检样品加入高峰氏淀粉酶及糖化酶酶解,最终水解为葡萄糖。在强碱溶液及沸水浴环境中使3,5-二硝基水杨酸与葡萄糖反应生成棕红色的氨基化合物,在540 nm处测定反应液吸光度。结果显示,葡萄糖的量与反应液的吸光度呈线性关系,相关系数为0.9995,相对标准偏差小于0.5%,检测结果与旋光法及酶水解法测定的结果差别不大。研究表明,试验所用方法测定饲料中的淀粉含量具有简便易行、快速、精确度高及重复性好等优点,可作为饲料中淀粉含量检测的常规方法。