Synthesis, Crystal Structure, Fluorescent Property and DFT Calculations of a New Zn(Ⅱ) Complex Based on 3-(2-Pyridyl)-5-(4-pyridyl)-1H-1,2,4-triazole

A new coordination compound Zn（2,4＇-bpt）2（H2O）（1） based on the versatile ligand 2,4＇-Hbpt（2,4？-Hbpt = 3-（2-pyridyl）-5-（4-pyridyl）-1H-1,2,4-triazole） was prepared by hydrothermal reactions. The structure of complex 1 has been characterized by X-ray single-crystal diffraction, elemental analysis, X-ray powder diffraction, IR spectrum analysis and thermogravimetric analysis. Single-crystal X-ray diffraction analysis indicates that the complex belongs to monoclinic system, space group C2/c with a = 23.877（3）, b = 0.7483（9）, c = 1.2492（2） A, b = 92.681（2）°, V = 2230.6（4） A^3, Z = 4, Dc = 1.572 g/cm^3, m = 1.143 mm^-1, Mr = 527.85 and F（000） = 1080. The final R = 0.0581 and wR = 0.0898 with I 〉 2s（I）. 1 is a 0D motif which is connected by hydrogen bonds to form a corrugated 1D pattern. In addition, 1 shows strong photoluminescent emissions in the solid state at room temperature which can be used as potential optical materials. Theoretical calculations based on density functional theory（DFT） were employed in order to explicate the stability and chemical reactivity of 2,4＇-Hbpt with different conformations. The results indicated that conformation I is more stable and prior to coordination in the reactions.

Catalytic Kinetic on the Thermal Decomposition of Ammonium Perchlorate with a New Energetic Complex Based on 3,5-Bis(3-pyridyl)-1H-1,2,4-triazole

A new energetic complex,[Co（3,3？-Hbpt）（Htm）]·H_2O（1,3,3？-Hbpt = 3,5-bis（3-pyridyl）-1H-1,2,4-triazole and H_3tm = trimesic acid）,has been synthesized by hydrothermal reactions and characterized by single-crystal X-ray diffraction,elementary analysis,IR spectroscopy,thermogravimetric analysis and X-ray powder diffraction. Single-crystal X-ray diffraction indicates that the complex belongs to triclinic system,space group P 1 with a = 10.0911（1）,b = 10.2573（1）,c = 10.6393（1） ？,α = 103.793（2）,β = 101.041（2）,γ = 107.918（3）o,V = 974.9（2） ？~3,Z = 2,D_c = 1.732 g·cm-3,μ = 0.941 mm^（-1）,M_r = 508.31,F（000） = 518,the final R = 0.0523 and wR = 0.0935 with I 〉 2σ（I）. In the title complex,Co（Ⅱ） ions are connected by Htm2-anions generating 1D ladder-like chains which are linked by 3,3？-Hbpt to form 1D cages. In addition,the thermal decomposition of ammonium perchlorate（AP） with complex 1 was explored by differential scanning calorimetry（DSC）. AP is completely decomposed in a shorter time in the presence of complex 1,and the decomposition heat of the mixture is 2.531 kJ·g^（-1）,significantly higher than that of pure AP. By Kissinger＇s method,the ratio of Ea/ln（A） is 11.05 for the mixture,which indicates that complex 1 shows good catalytic activity toward the AP decomposition.

Aromatic Multicarboxylate Ligands Tuned One-and Three-dimensional Zn(Ⅱ) Coordination Polymers Based on 3-(1H-pyrazol-4-yl)-5-(pyridin-3-yl)-1,2,4-triazole

Two aromatic multicarboxylate ligands tuned Zn(Ⅱ) coordination polymers, namely, {[Zn0.5(H2L)(tp)0.5(H2O)]H2O}n(1) and {[Zn2(HL)(btc)(H2O)]H2O}n(2)(H2L = 3-(1 Hpyrazol-4-yl)-5-(pyridin-3-yl)-1,2,4-triazole, H2tp = terephthalic acid;H3 btc = 1,3,5-benzenetricarboxylic) have been synthesized. Their structures were characterized by single-crystal X-ray diffraction analysis, elemental analyses and infrared spectra. Compound 1 possesses a one-dimensional chain structure and is finally extended into a three-dimensional supramolecular architecture though hydrogen bonding interactions. Compound 2 shows a three-dimensional framework. Meanwhile, compounds 1 and 2 exhibit luminescent emission in the solid, and can be investigated as potential luminescent materials.

Theoretical Study on the Mechanism of a New Synthesis Reaction of 1,3,5-Substituted-1,2,4-triazoles by Carboxylic Acids,Amidines,and Hydrazines

The synthesis of 1,3,5-substituted-1,2,4-triazoles from α-imino-3-pyridine formic acid,acetamidine and anisole hydrazine as a model reaction in this paper and the synthesis mechanism of 1,3,5-substituted-1,2,4-triazole compounds from carboxylic acids,amidines and hydrazines have been first investigated with the B3 LYP/6-311＋＋G＊＊ method.According to the potential energy profile,it can be predicted that the course of the reaction consists of five reactions containing six elementary reactions.The α-imino-3-pyridine formic acid and acetamidine form first an intermediate product through a dehydration reaction; the intermediate product further combines with hydrogen ion to form a positive ion; the positive ion reacts with anisole hydrazine by a dehydration reaction to form another positive ion; then,followed by two isomerization reactions,the final reaction with the acetate ion（Ac-） produces the final product.The research results reveal the laws of synthesis reaction of 1,3,5-substituted-1,2,4-triazoles by the carboxylic acids,amidines,hydrazines and their derivatives on theoretical level.It provides the systemic theoretical basis for the synthesis,development and application of 1,3,5-substituted-1,2,4-triazole compounds.

5-取代-4-氨基-3-巯基-1,2,4-三唑衍生物的应用进展

5-取代-4-氨基-3-巯基-1,2,4-三唑是一类重要的五元杂环化合物,由于分子中含有巯基和伯胺基两个活性基团,既可以单个基团参与反应生成N-或S-取代产物,又可以同时发生反应生成稠杂环化合物。由其衍生而来的化合物具有广泛的生物活性,在抗菌、抗肿瘤、抗结核、抗炎镇痛、酶抑制剂、荧光探针等方面都表现出优异的性能。综述了近年来5-取代-4-氨基-3-巯基-1,2,4-三唑衍生物在医学、农业及材料领域的应用,为今后进一步研究、开发此类化合物提供参考。

微波促进下3-(2-苯并呋喃基)-4-氨基-5-巯基-1,2,4-三唑及其衍生物的合成

微波辐射条件下,首先由2-苯并呋喃甲酰肼依次与二硫化碳和水合肼反应合成3-(2-苯并呋喃基)-4-氨基-5-巯基-1,2,4-三唑,进一步在微波辐射条件下由4-氨基-5-巯基-1,2,4-三唑分别与芳甲酸/芳氧基乙酸、α-溴代苯乙酮及芳醛反应以较高产率制得了相应的1,2,4-三唑并[3,4-b]-1,3,4-噻二唑、1,2,4-三唑并[3,4-b]-1,3,4-噻二嗪及4-芳亚甲基亚胺基-5-巯基-1,2,4-三唑.产物结构经IR,1HNMR,MS及元素分析进行了表征.

3-硝基-1,2,4-三唑-5-酮二甲胺盐(CH_3)_2NH_2^+C_2N_4O_3H^-的合成、晶体结构和量子化学研究

利用 3 硝基 1,2 ,4 三唑 5 酮 (NTO)的乙醇溶液与二甲胺的水溶液合成了NTO的二甲胺盐 (CH3 ) 2 NH+ 2 C2 N4O3 H-,在二甲基甲酰胺 (DMF)和甲醇的混合溶剂 (体积比为 1∶5 )中培养出单晶 .通过X射线单晶结构分析法测定分子结构和晶体结构 ,晶体属单斜晶系 ,空间群为P2 ( 1) /c ,晶胞参数为 :a =0 7116( 1)nm ,b =0 873 5 ( 2 )nm ,c =1 3 160 ( 3 )nm ,β =10 1 12( 2 )° ,V =0 80 2 6( 3 )nm3 ,Dc=1 45 0g/cm3 ,Z =4,F( 0 0 0 ) =3 68.采取HF/ 6 3 1+G(d)和MP2 / 6 3 1+G(d)以及B3LYP/6 3 1+G(d)方法对标题化合物进行了几何全优化 ,并对其成键情况。

2-芳氧基-3-苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3H)-酮衍生物的合成及其抑菌活性研究

以自制2-氨基-4-甲基-5-（1H-1,2,4-三唑-1-基）-噻吩-3-甲酸乙酯为起始原料制得膦亚胺,膦亚胺与苯基异氰酸酯作用得到碳二亚胺,在碳酸钾的催化下,碳二亚胺与酚反应得到4个新型的2-芳氧基-3-苯基-5-甲基-6-（1H-1,2,4-三唑-1-基）噻吩并[2,3-d]嘧啶-4（3H）-酮衍生物（3a-3d）,收率为70%~86%,通过1 H NMR、MS和元素分析等方法对合成化合物进行了结构表征,并初步测定了合成化合物的生物活性。结果表明,目标化合物对常见农作物部分菌体均表现出一定的抑菌活性,其中以2-萘氧基-3-苯基-5-甲基-6-（1H-1,2,4-三唑-1-基）噻吩并[2,3-d]嘧啶-4（3H）-酮活性最好,在浓度为5×10-5g/L时,对苹果轮纹菌的抑制率达到80%。

2-烷氧基-3-对氟苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3H)-酮的合成及其抑菌活性研究

通过Gewald反应合成噻吩衍生物,再由噻吩衍生物、对氟苯基异氰酸酯分别与甲醇、乙醇、正丙醇经串联aza-Wittig反应合成了3个新型的2-烷氧基-3-对氟苯基-5-甲基-6-(1 H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3 H)-酮,经1 HNMR、MS和元素分析表征了其结构,并初步测定了合成化合物的抑菌活性。结果表明,在用药浓度为5×10-5g·L-1时,3种化合物对常见农作物菌种均表现出一定的抑菌活性,其中以2-甲氧基-3-对氟苯基-5-甲基-6-(1 H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3 H)-酮的活性最高,对水稻纹枯菌的抑制率达90%。

2′,4′-二硝基苯基-1,2,4三唑铜-5的合成

通过甲酸和氨基脲反应制得的 1,2 ,4-三唑酮 - 5与 2 ,4-二硝基氟苯反应制备了 2′ ,4′ -二硝基苯基 - 1,2 ,4-三唑酮 - 5。

2-羟基-3-苯偶氮吡唑[5,1-c]苯并-1,2,4-三嗪衍生物的合成

合成了8种1苯基3羟基5氨基4苯偶氮吡唑及其关环产物2羟基3苯偶氮吡唑[5,1c]苯并1,2,4三嗪衍生物,经元素分析、IR和质谱分析确定了其结构。

3-苯氧甲基-6-(2,4-二氟苯基)-7H-1,2,4-三唑并[3,4-b][1,3,4]噻二嗪的合成与晶体结构研究

由苯氧乙酸出发 ,经多步反应 ,制得 3 苯氧甲基 4 氨基 5 巯基 1,2 ,4 三唑 ,它与 2 氯 2′ ,4′ 二氟苯乙酮进行环化反应 ,生成 3 苯氧甲基 6 (2 ,4 二氟苯基 ) 7H 1,2 ,4 三唑并 [3 ,4 b] [1,3 ,4]噻二嗪 ,通过元素分析、红外光谱、核磁共振氢谱与碳谱、质谱进行表征 ,并利用单晶X射线衍射法测定其结构 .晶体属单斜晶系 ,P2 1/c空间群 ,a =1 3 3 9(3 )nm ,b =1 4683 (4 )nm ,c =0 860 6(2 )nm ,β =10 8 49(2 )° ,Z =4,F(0 0 0 ) =73 6,R1=0 0 5 0 9.还对均三唑并噻二嗪。

新型的2-烷氨基-3-苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)-噻吩并[2,3-d]嘧啶-4(3H)-酮衍生物的合成及其抑菌活性

用烯基膦亚胺与苯基异氰酸酯、伯胺的串联aza-W ittig反应合成了8个新型的2-烷氨基-3-苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)-噻吩并[2,3-d]嘧啶-4(3H)-酮衍生物(6a^6h),其结构经1H NMR,MS和元素分析表征。生物活性测试结果表明,部分化合物表现出一定的抑菌活性,其中6 c活性最好,在c(6 c)=5×10-5g.L-1时,对棉花枯萎菌的抑制率达90%。

3-烷基/芳基-6-(2′,4′-二氯苯基)-7H-1,2,4-三唑[3,4-b]-1,3,4-噻二嗪的合成及波谱性质

以间二氯苯与氯乙酰氯反应 ,生成ω 氯代 2 ,4 二氯苯乙酮 (1) ,再使之分别与 3 烷基 /芳基 4 氨基 5 巯基 1,2 ,4 三唑 (2a～ 2l)反应 ,合成了 12种新的 3 烷基 /芳基 6 (2′ ,4′ 二氯苯基 ) 7H 1,2 ,4 三唑并 [3,4 b]1,3,4 噻二嗪 (4a～ 4l)。利用EA ,IR ,1HNMR确定了其结构 ,并提出该反应的可能机制。

新型1,2,4-三唑类衍生物的合成及表征

以水杨醛和对羟基苯甲醛为起始原料,与1,2-二溴乙烷缩合得中间体1,2-双(2-甲酰基苯氧)乙烷和1,2-双(4-甲酰基苯氧)乙烷,再与取代的1,2,4-三唑在醋酸回流下缩合,即制得相应的目标化合物三唑席夫碱。利用IR、1HNMR、ESI/MS和13CNMR或元素分析确证了所得目标化合物的结构。

微波作用下1-苯基-5-[5-(芳胺羰基甲硫基)-4-苯基-1,2,4-三唑-3-甲硫基]四唑的合成及生物活性

采用微波和相转移催化法通过1-苯基-5-(4-苯基-1,2,4-三唑-5-巯基-3-甲硫基)四唑(2)与2-氯乙酰芳胺(3)反应高效、快速地合成了10种尚未见文献报道的1-苯基-5-[5-(芳胺羰基甲硫基)-4-苯基-1,2,4-三唑-3-甲硫基]四唑.其结构经IR,1HNMR,13CNMR和元素分析表征.生物活性实验结果表明,该类化合物在较低浓度下部分化合物对小麦芽有很好的促进作用.

4-氨基-1,2,4-三唑-NTO盐的晶体结构及性能

用X射线单晶衍射法测定了4-氨基-1,2,4-三唑(4-AT)与3-硝基-1,2,4-三唑-5-酮(NTO)制得的盐(AT)(NTO)的单晶结构。结果表明:该晶体为单斜晶系,属P21/c空间群,晶体学参数a=7.071(2),b=6.361(3),c=18.792(7);β=96.43(3)°;V=839.9(5)3;Z=4;Dc=1.694 g.cm-3;μ=0.145/mm;F(000)=440。在(AT)(NTO)晶体中,4-AT阳离子上所有的原子和NTO阴离子上所有的原子均在以各自三唑环为基础的一个平面上,两平面夹角为7.6°。由真空安定性(VST)、撞击感度、摩擦感度和静电火花感度试验所得的真空放气量、特性落高、爆炸概率、50%发火电压、50%发火能分别为0.28 mL.g-1(100℃/48 h),124.7 cm,0%,12.841 kV和2.515 J,表明,(AT)(NTO)对热是稳定的,对撞击、摩擦和静电火花是不敏感的。

4-[1,2,4]三氮唑-1-基甲基苯腈的合成

改进4-[1,2,4]三氮唑-1-基甲基苯腈的合成方法,以价廉易得的对氰基氯苄代替对氰基溴苄,研究对氰基氯苄与1H-[1,2,4]三氮唑的N-烃基化反应及合成4-[1,2,4]三氮唑-1-基甲基苯腈的工艺条件.实验所选用的最佳工艺条件:对氰基氯苄为0.03 mol,1H-[1,2,4]三氮唑用量为0.045 mol,乙腈溶剂为20 mL,混合碱(无水碳酸钾和氢氧化钾的量比为1∶1)的总用量为0.03 mol,反应温度为70℃,反应时间为5 h,在此条件下,4-[1,2,4]三氮唑-1-基甲基苯腈的收率可达76%.

2′,4′-二氟-2-(1H-1,2,4-三唑-1-基)苯乙酮的合成

在相转移催化剂存在的条件下,以1,2,4-三氮唑和2-氯-2′,4′-二氟苯乙酮为原料合成2′,4′-二氟-2-(1H-1,2,4-三唑-1-基)苯乙酮,分别讨论了原料配比、反应时间、缚酸剂、溶剂对合成反应的影响,确定了最佳合成工艺条件,产物收率可达82.6%。

2-烷氨基-3-对氟苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)-噻吩并[2,3-d]嘧啶-4(3H)-酮衍生物的合成及其杀菌活性

已见含氟类有机物具有杀菌能力的报道,将氟元素引入到噻吩并嘧啶酮的衍生物之中,考查其杀菌活性。通过Gewald反应生成噻吩,产物同PPh3、C2Cl6、Et3N作用得到膦亚胺,再用对氟苯基异氰酸酯与之作用得到碳二亚胺,之后与伯胺反应得到10种新的标题化合物,其结构经1HNMR、MS和元素分析表征。生物活性测试表明,此类衍生物对常见农作物部分菌体均表现出较大的抑制作用,其中以2-正庚氨基-3-对氟苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)-噻吩并[2,3-d]嘧啶-4(3H)-酮活性最好,它对棉花枯萎菌的抑制率达90%。该系列物质相对不含氟元素的同种取代基的噻吩并嘧啶酮衍生物的杀菌活性有一定程度的提高。