共查询到19条相似文献,搜索用时 109 毫秒
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以水杨醛和取代苯胺为原料,在无溶剂条件下合成了一系列Schiff碱,该方法不仅收率高(82%~95%),而且反应时间短,对环境污染少。用1H NMR、13C NMR和IR等对产物结构进行了确证。同时还研究了这类Schiff碱的紫外和荧光性质,化合物均具有较强的荧光发射光谱,发射峰值波长(λem)在470~524 nm。当苯环邻、对位引入供电子基时,发射波长明显红移,而当间位引人供电子基时,发射波长蓝移。苯环上引入吸电子取代基时,发射波长蓝移。 相似文献
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以三聚氯氰、二乙胺、对硝基酚、1,2-二溴乙烷、水杨醛、对羟基苯甲醛、香草醛和异香草醛为原料,采用高度稀释法合成了一类新型的含三嗪环的席夫碱大环化合物,并通过IR、1H NMR和ESI/MS对其结构进行了表征。紫外光谱研究表明,席夫碱大环5对Fe3+离子有专一性识别作用。 相似文献
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以异硫氰酸苯酯、氨基硫脲、乙二胺、氨基脲和二乙撑三胺为原料,合成了异硫氰酸苯酯-氨基甲酰肼(PITCAM)、异硫氰酸苯酯-硫代氨基脲(PITCTSC),双异硫氰酸苯酯-1,2-二氨基乙烷(PITCE)和双异硫氰酸苯酯-二乙撑三胺(PITCD)4种多基硫脲类Schiff碱,其结构经1HNMR、IR、ESI-MS和元素分析进行表征.对4种合成的化合物进行抑制大肠杆菌、金黄色葡萄球菌以及欧文氏草生杆菌的生物活性测定,结果表明4种合成的多基硫脲类Schiff碱化合物均具有一定的生物抑菌活性,其中合成的化合物PITCAM的生物抑菌活性最好;测试其对不同金属离子的荧光响应光谱,实验结果表明PITCAM对Cu2响应明显. 相似文献
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Vanillin (4‐hydroxy‐3‐methoxy benzaldehyde) and 5‐formylamino salicylic acid microbicides were reacted with polyoxyalkylene‐montmorillonite (D230–2000‐MMT) nanocomposites. The microstructure of these Schiff base nanocomposites was characterized by TEM and XRD. D230–2000‐MMT nanocomposites were prepared by an ion exchange process of sodium montmorillonite (Na‐MMT) and NH3 + groups in polyoxyalkylene amine hydrochloride with three different molecular masses of D230, D400, and D2000. Wide‐angle X‐ray diffraction confirms the intercalation of the polymer between the silicate layers. Electrostatic interaction between the positively charged NH3 + groups and the negatively charged surface of MMT was observed. The nanocomposites were tested for antimicrobial activity against the Gram‐negative bacteria (Escherichia coli NCIM 2065), Gram‐positive bacteria (Bacillus subtillus ATCC), and fungi (Candida albicans SC5314 and Cryptococcus neoformans). The D2000‐MMT/vanillin Schiff base nanocomposite strongly inhibited the growth of all microorganisms that can be used in different applications. The amount of loaded polymer and the structure of the nanocomposite play an important role in inhibiting the bacterial and fungal strains. It is found that the Schiff base nanocomposite affect the morphology, oxygen consumption, and the release of cytoplasmic constituents such as potassium (K+), sodium (Na+), and calcium (Ca2+) ions leading to death of the cells. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers 相似文献
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以4-硝基邻苯二甲腈为主要原料,合成两种席夫碱锌酞菁:2(3),9(10),16(17),23(24)-四(4-苯亚胺苯氧基)锌酞菁(C84H52N12O4Zn)(APc)和2(3)-[(2-甲基-8-羟基喹啉基]-9(10),16(17),23(24)-三(4-苯亚胺苯氧基)锌酞菁(C81H50N12O4Zn)(BPc)。通过核磁、红外、紫外、元素分析等手段对其结构进行表征。结果表明:浓度在1.499×10-5~2.407×10-5 mol/L时,APc有J聚集存在,而BPc在所测浓度范围内不发生聚集;APc和BPc的Q带的最大吸收峰分别在672nm和676nm,与无取代的酞菁锌669nm相比,明显红移。采用循环伏安法对其电化学性质和能级结构进行研究,这两种锌酞菁的LUMO(-5.411 eV,-5.384 eV)和HOMO(-4.214 eV,-4.210 eV)与纳米TiO2 导带能级匹配。 相似文献
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A. V. Raghu G. S. Gadaginamath Han Mo Jeong N. T. Mathew S. B. Halligudi T. M. Aminabhavi 《应用聚合物科学杂志》2009,113(5):2747-2754
Eight different types of novel polyurethanes (PUs) were synthesized through the polyaddition reaction of 4,4′‐(ethane‐1,2‐diylidenedinitrilo)diphenol and 4,4′‐(pentane‐1,5‐diylidenedinitrilo)diphenol with four different diisocyanates: 4,4′‐diphenylmethane diisocyanate, toluene 2,4‐diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate. The resulting PUs were soluble in polar, aprotic solvents. Structures of the diols and PUs were established with ultraviolet–visible, fluorescence, Fourier transform infrared (FTIR), 1H‐NMR, and 13C‐NMR spectroscopy data. FTIR and NMR spectral data indicated the disappearance of both hydroxyl and isocyanate groups in the PUs. The thermal properties were investigated with thermogravimetry and differential scanning calorimetry. The weight losses, glass transitions, onset temperatures, and crystalline melting temperatures were measured. All the PUs exhibited semicrystalline and amorphous morphologies, as indicated by X‐ray diffraction. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009. 相似文献
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以D-氨基葡萄糖盐酸盐与对甲氧基苯甲醛、对甲基苯甲醛反应合成了两种新的D-氨基葡萄糖席夫碱(对甲氧基苯甲醛缩D-氨基葡萄糖席夫碱、对甲基苯甲醛缩D-氨基葡萄糖席夫碱),收率分别为67.9%、74.6%。使用UV1、HNMR和IR对产物进行了结构表征。测试了两种席夫碱甲醇饱和溶液对香蕉炭疽病菌、芒果炭疽病菌、芒果蒂腐病菌、芒果焦腐病菌、番木瓜炭疽病菌等植物病原真菌的抑菌性能。结果表明,对甲氧基苯甲醛缩D-氨基葡萄糖席夫碱对香蕉炭疽病菌、芒果蒂腐病菌、芒果焦腐病菌具有很强的抑菌活性,对甲基苯甲醛缩D-氨基葡萄糖席夫碱对香蕉炭疽病菌、芒果炭疽病菌具有很强的抑菌活性。 相似文献