共查询到20条相似文献,搜索用时 46 毫秒
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合成了3种可聚合的1,8-萘酰亚胺衍生物, 并研究了其在二甲基亚砜(DMSO)溶液中的光物理性质. 这些化合物表现出的光物理性质与其电子环境有关. 通过溶胶-凝胶法制备了可聚合1,8-萘酰亚胺衍生物与硅氧烷的共聚物. 尽管3种萘酰亚胺衍生物C-4位的取代基不同, 但在3-氨丙基三乙氧基硅烷(APTES)固凝胶中摩尔分数为0.06%时荧光强度均最大. 利用 29Si MAS NMR对合成材料进行了表征, 结果表明, 硅氧烷的缩聚程度影响材料的荧光强度, 说明材料中荧光单元的分子运动对材料的荧光性能有重要影响. 相似文献
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1,8—萘酐和1,8—萘酰亚胺中硝基和卤素基团的亲核取代反应 总被引:2,自引:0,他引:2
研究了1,8-萘酐和1,8-萘酰亚胺萘环上硝基和卤素原子的亲核取代反应,讨论了影响亲核取代反应的因素,根据2,4-二硝基苯酚与脂胺肪的亲核取代机理,提出了4-硝基-1,8-萘酐及4-硝基-1,8-萘酰亚胺与脂肪胺发生亲核取代反应可能的反应机理。 相似文献
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经5步反应制备了萘/苝酰亚胺取代的端炔和碘炔单体, 通过Sonagashira偶联反应合成了2个新型对称丁二炔单体浅黄色粉末2-[4-(4-{4-[7-(庚-3-基)-1,3,6,8-四氧亚基-1,2,3,6,7,8-六氢异喹啉并[6,5,4-def]异喹啉-2-基]苯基}丁-1,3-二炔基)苯基]-7-(辛-4-基)-1,2,3,6,7,8-六氢异喹啉并[6,5,4-def]异喹啉-1,3,6,8-四酮(diNDI)和暗红色粉末2-[4-(4-{4-[1,3,8,10-四氧亚基-9-(二十三烷-12-基)-1,2,3,8,9,10-六氢异喹啉并[6',5',4':9,1,2]蒽并[6,5,10-def]异喹啉-2-基]苯基}丁-1,3-二炔基)苯基]-9-(二十三烷-12-基)-1,2,3,8,9,10-六氢异喹啉并[6',5',4':9,1,2]蒽并 [6,5,10-def]异喹啉-1,3,8,10-四酮(diPDI), 产率分别达60%和70%. 由于NDI和PDI基元的强吸电子作用, diNDI和diPDI表现较低的最低未占分子轨道(LUMO)能级, 分别为?3.80和?3.70 eV. 单晶数据表明, 萘酰亚胺基元的分子间氢键及π-π作用对diNDI分子堆积结构起主导作用, diNDI呈层状堆积模式. 由差示扫描量热(DSC)实验结果可知, diNDI丁二炔经加热可发生固态聚合. 加热条件下diNDI的紫外-可见吸收光谱及原位拉曼光谱特征峰以及在波长532 nm激光强度为10%的辐照条件下原位拉曼光谱特征峰的变化均表明diNDI微纳晶发生了非常规的1,4-加成聚合, 并且新生成的共轭主链是无序的, 同时发现激光辐照条件下更易促进聚合反应. 相似文献
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以1,8-萘酰亚胺为原料,合成了两种含萘酰亚胺官能团的乙烯基单体(NAPa和NAPb)。通过核磁、元素分析、紫外吸收光谱等对化合物结构进行了表征。并以这两种化合物为单体,通过原子转移自由基聚合(ATRP)的方法合成了它们均聚物,用1H-NMR ,GPC等对均聚物的结构进行了表征。研究了单体及其聚合物在不同浓度、不同溶剂以及在聚合物薄膜中的激发和发射荧光光谱,考察了聚合物浓度、溶剂极性等对荧光的影响。结果表明,单体和均聚物都具有较强的绿色荧光, 均聚物的荧光量子效率(φPNAPa=0.34, φPNAPb=0.35)高于单体的荧光量子效率(φNAPa=0.25, φNAPb=0.27)。 相似文献
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烯酮类化合物发光行为的研究 总被引:1,自引:0,他引:1
本工作合成了几种带桥键结构的烯酮类化合物, 研究了它们的光谱和光物理行为.结果表明那些分子内的双键因桥键化而成环的化合物具有很强的荧光量子产率,相反那些未桥键化或桥键化而双键未处于环内者则仅有较弱的荧光强度, 工作中还观察到该类化合物的"负溶致动力学效应"以及其荧光强度强烈地依赖于所用溶剂极性等现象,对所得结果进行了初步的讨论. 相似文献
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Hiroyoshi Kamogawa Kunimichi Kitahora Hidehito Hanawa Masato Nanasawa 《Journal of polymer science. Part A, Polymer chemistry》1976,14(5):1235-1240
Several polymerizable hydroquinone derivatives were prepared by the Williamson synthesis. Thus, hydroquinone mono(p-vinylbenzyl) ether (III-1), hydroquinone methyl p-vinylbenzyl ether (III-4), and hydroquinone benzyl p-vinylbenzyl ether (III-5), tert-butylhydroquinone mono(p-vinylbenzyl) ether (III-2), and 2,5-di-tert-butylhydroquinone mono(p-vinylbenzyl) ether (III-3) were synthesized by the reactions of p-chloromethylstyrene with the corresponding hydroquinone derivatives in alcoholic potassium hydroxide or with their potassium salts in dipolar aprotic solvents. All monomers were found to polymerize by free-radical initiation except III-3, which required a cationic initiator. 相似文献
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Using water-soluble 1,8-naphthalimide derivatives, the mechanisms of photosensitized DNA damage have been elucidated. Specifically, a comparison of rate constants for the photoinduced relaxation of supercoiled to circular DNA, as a function of dissolved halide, oxygen and naphthalimide concentration, has been carried out. The singlet excited states of the naphthalimide derivatives were quenched by chloride, bromide and iodide. In all cases the quenching products were naphthalimide triplet states, produced by induced intersystem crossing within the collision complex. Similarly, the halides were found to quench the triplet excited state of the 1,8-naphthalimide derivatives by an electron transfer mechanism. Bimolecular rate constants were < 10(5) M-1 s-1 for quenching by bromide and chloride. As expected from thermodynamic considerations quenching by iodide was 6.7 x 10(9) and 8.8 x 10(9) M-1 s-1 for the two 1,8-naphthalimide derivatives employed. At sufficiently high ground-state concentration self-quenching of the naphthalimide triplet excited state also occurs. The photosensitized conversion of supercoiled to circular DNA is fastest when self-quenching reactions are favored. The results suggest that, in the case of 1,8-naphthalimide derivatives, radicals derived from quenching of the triplet state by ground-state chromophores are more effective in cleaving DNA than reactive oxygen species or radicals derived from halogen atoms. 相似文献
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Hiroyoshi Kamogawa Hideyuki Mizuno Yasuto Todo Masato Nanasawa 《Journal of polymer science. Part A, Polymer chemistry》1979,17(10):3149-3157
Viologens that bore a terminal vinyl group were synthesized by four sequences of reactions: (1) N-vinylbenzyl-N′-n-propyl-4,4′-bipyridinium bromide chloride (V) was synthesized by the reaction of 4-(4′-pyrodyl)-N-n-propyl pyridinium bromide (III) with vinylbenzyl chloride; (2) N-β-acrylamidoethyl-N′-n-propyl-4,4′-bipyridinium dibromide (IX) was synthesized by the Menschutkin reaction of III with 2-aminoethyl bromide hydrobromide and subsequent reaction with acryloyl chloride; (3) N-β-methacryloyloxyethyl-N′-n-propyl-4,4′-bipyridinium dibromide and its analogs (XI) were synthesized by the reactions of III with the corresponding acyloxyalkyl bromides; and (4) N-vinyloxycarbonylmethyl-N′-n-propyl-4,4′-bipyridinium bromide chloride (XIII) was synthesized by the reaction of III with vinyl chloroacetate. With the exception of monomer XIII in which hydrolysis in large extent was observed during attempted polymerization, the synthesized monomers polymerized smoothly in aqueous solutions by a conventional radical procedure. Comparisons of the absorption peaks of the radical cations produced by reductions in aqueous solutions with those produced in films by ultraviolet (UV) irradiation indicate that the radical cations of polymers are associated intramolecularly in aqueous solutions. 相似文献
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Shohre Rouhani Kamaladin Gharanjig Mozhgan Hossein Nezhad 《Green Chemistry Letters and Reviews》2014,7(2):174-178
This study describes the ultrasound-assisted synthesis of 4-nitro-N-substituted-1,8-naphthalimide derivatives from 4-nitro-1,8-naphthalic anhydride and related amines by irradiating at 35 KHz in a sonic bath in aqueous media at room temperature. The results obtained by this method are comparable to those obtained by a common reflux method. The imidation reaction under ultrasound irradiation preceded 8 and 20 times faster than the common method and produced higher yields. 相似文献
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本工作合成了两种旋转受阻取代的苯乙烯基吡嗪衍生物。详细研究了环境温度、极性和粘度对其光物理及发光行为的影响。结果表明两化合物在基态时可能存在着"平面构象与扭曲构象"间的平衡, 环境的温度、极性和粘度对于化合物存在的构象有很大影响。扭曲构象为较好的发光构象。分子受激后, 平面构象可经旋转松弛到扭曲构象。两化合物的荧光量子产率在室温条件下基本不随溶剂极性变化而变, 仅与溶剂粘度有关, 利用该性质可建议其作为一种有效的粘度荧光探针。 相似文献