共查询到20条相似文献,搜索用时 93 毫秒
1.
0 IntroductionMetallosupramolecular oligomers and polymerscan result from the interaction of metal ions with ap-propriate multidentate ligands designed for multinucle-ar binding[1,2], and there are considerable interests in thedesign of species containing known numbers of metalions in defined spatial arrangements. The electronic andphotophysical properties of oligopyridine complexes oftransition-metal ions make their incorporation particu-larlyattractive and the possibilityofinter-metallic ele… 相似文献
2.
3.
4.
利用还原偶联方法合成出新化合物四 (4,4′ ,4″ ,4 N ,N 二乙氨基 )四苯乙烯 (TDETE) .通过测定该化合物在溶液、掺杂聚合物中及晶体粉末的稳态 -瞬态荧光光谱、荧光量子产率和辐射衰变速率常数等 ,讨论了分子的构象效应等因素对TDETE光致发光行为的影响 .在一定浓度下TDETE溶液存在着三个发光带 ,分别为全扭曲构象分子 (位于 3 4 5nm附近的发光I带 )、半扭曲构象分子 (位于 43 0nm附近的发光II带 )和激基缔合物 (53 0nm发光III带 )的辐射衰变所致 .在聚合物(PMMA)中 ,一方面由于分子单键的自由旋转扭曲受到遏制 ,表现为II带的辐射衰变速率常数 (kf 值 )增大、同时非辐射衰变速率常数 (knf值 )减小 ;另一方面 ,TDETE分子之间相互作用得到加强而有利于缔合物形成 ,结果 ,使发光II带和III带合二为一出现了强而宽的发射峰 ,荧光量子产率从溶液中的 0 0 55提高到 0 855.此外 ,在PMMA介质中观测到TDETE分子聚集体在 62 6nm处的发光带 (IV) ,粉末态中聚集体IV带的强度骤增 ,峰值波长红移至 650nm 相似文献
5.
6.
7.
以4-磺酸钾邻苯二腈为原料合成了水溶性四磺酸酞菁(H2PcTS)及其金属配合物(ZnPcTS, FePcTS, CoPcTS), 通过透析法提纯得到了纯度较高的产物. 采用傅里叶变换红外光谱(FTIR)、紫外-可见吸收光谱(UV-Vis)、核磁共振氢谱(1H NMR)及循环伏安(CV)等测试手段表征了四磺酸酞菁及其配合物的结构和性质. 结果表明, 磺酸酞菁在水溶液中存在不同程度的聚集现象, 金属离子的配位会对磺酸酞菁的光谱和电化学性质产生影响. 研究了磺酸酞菁作为光敏剂催化氧化1,5-萘二酚的反应, 发现FePcTS/H2O2催化体系对1,5-萘二酚具有良好的催化氧化性能, 氧化产物主要为5-羟基-1,4-萘醌. 比较了不同溶液pH值对FePcTS和H2PcTS催化能力的影响, 初步探讨了该反应的催化机理. 相似文献
8.
9.
利用还原偶联方法合成出新化合物四(4,4′,4",4′″-N,N-二乙氨基)四苯乙烯(TDEFE).通过测定该化合物在溶液、掺杂聚合物中及晶体粉末的稳态-瞬态荧光光谱、荧光量子产率和辐射衰变速率常数等,讨论了分子的构象效应等因素对TDETE光致发光行为的影响.在一定浓度下TDETE溶液存在着三个发光带,分别为全扭曲构象分子(位于345 nm附近的发光Ⅰ带)、半扭曲构象分子(位于430 nm附近的发光Ⅱ带)和激基缔合物(530 nm发光Ⅲ带)的辐射衰变所致.在聚合物(PMMA)中,一方面由于分子单键的自由旋转扭曲受到遏制,表现为Ⅱ带的辐射衰变速率常数(kf值)增大、同时非辐射衰变速率常数(knf值)减小;另一方面,TDETE分子之间相互作用得到加强而有利于缔合物形成,结果,使发光Ⅱ带和Ⅲ带合二为一出现了强而宽的发射峰,荧光量子产率从溶液中的0.055提高到0.855.此外,在PMMA介质中观测到TDETE分子聚集体在626 nm处的发光带(Ⅳ),粉末态中聚集体Ⅳ带的强度骤增,峰值波长红移至650 nm. 相似文献
10.
以3(4)-硝基邻苯二腈为起始原料经过两步反应合成了α(β)-四苯氧基酞菁.通过谱学方法和元素分析表征了其结构,研究了中心离子和取代基位置对酞菁吸收波长、发射波长和荧光强度的影响.结果表明,取代位置对最大吸收波长、最大发射波长和荧光强度的影响较大,而中心离子对荧光强度的影响较大,可降低荧光强度甚至淬灭荧光. 相似文献
11.
Two series of solid complexes of rare earth nitrates and picrates with the “back-to-back” terpyridine, 6′,6″-bis(2-pyridyl)-2,2′:4′,4″:2″,2′′′-quaterpyridine (L) have been synthesized. These complexes have been characterized by elemental analysis, conductivity measurements, thermal analysis and IR spectroscopy. At the same time, the luminescent properties of the Eu(Ⅲ) and Tb(Ⅲ) complexes were also studied. 相似文献
12.
13.
分别采用微波辐射法和加热回流的常规方法,将1-氨基-2-(2-甲基/三氟甲基-苯并咪唑-1-亚甲基)-5-巯基-1,3,4-三唑与α-溴代芳基乙酮3a~3e反应,合成了一系列未见文献报道的1,2,4-三唑[3,4-b]-1',3',4'-噻二嗪类化合物4a~4e和5a~5e.微波辐射法具有反应时间短、产率高、副反应少等优点.标题化合物经元素分析,IR,1HNMR,MS确证结构. 相似文献
14.
以3,4-双(3'-氨基呋咱-4'-基)呋咱(BATF)为原料,经Caro’s acid氧化制备了3,4-双(3'-硝基呋咱-4'-基)呋咱(BNTF),收率为93%;基于BNTF分子中的NO2反应性,与水合肼、氨水等发生亲核取代、环化反应,合成了含能化合物7H-三呋咱并[3,4-b:3',4'-f:3',4'-d]氮杂环庚三烯(HTFAZ)和7-氨基-三呋咱并[3,4-b:3',4'-f:3',4'-d]氮杂环庚三烯(ATFAZ).在硝酸-醋酐体系中氧化HTFAZ得到新化合物7,7'-二(呋咱[3,4-b:3,4'-d:3',4'-f]氮杂环庚三烯)(BTFZ),采用红外光谱、核磁共振、元素分析和质谱等进行了结构表征.培养了HTFAZ单晶,X射线单晶衍射分析表明:HTFAZ晶体结构属单斜晶系,空间群为P2(1)/n,a=0.7252(15)nm,b=0.6458(14)nm,c=1.6814(4)nm,V=0.7781(3)nm3,Z=4,Dc=1.871 g·cm-3,F(000)=440,R1=0.0353,w R2=0.0895.开展了HTFAZ,ATFAZ和BTFZ的物化、爆轰性能和热性能研究,其中HTFAZ密度1.871 g·cm―3、生成焓733.7kJ·mol-1、熔点193.1℃、分解点345.1℃、爆速8416.5 m·s-1、爆压为32.9GPa;ATFAZ密度1.788 g·cm-3、生成焓831.2kJ·mol-1、熔点204~207℃、分解点323.7℃、爆速8300 m·s-1、爆压为30 GPa;BTFZ密度1.862 g·cm-3、生成焓1752.4kJ·mol-1、分解点280.2℃、爆速7924.5 m·s-1、爆压为28.42 GPa. 相似文献
15.
Yue Mei Jia Xiao Mei Liang Xue Qin.Fang Jing Ping Wu Dao Quan Wang Chang Hui Rui Xian Lin Fan Hai Yan Zhao Yun Xia Wang 《中国化学快报》2007,18(8):895-898
Six new 4"-benzyloxyimino-4"-deoxyavermectin B la derivatives were synthesized from avermectin Bla by the selective protection of C-5-hydroxy group, oxidation of C-4"-hydroxy group, and deprotection followed by reaction with O-substituted hydroxylamine hydrochlorides. Their structures were confirmed by IR, 1H NMR, 13C NMR and MS. Insecticidal activities of the derivatives against Phopalosiphum pseudobrassicae, Spodoptera exigua and Pluteua xylosteua were evaluated. 相似文献
16.
17.
《Journal of Coordination Chemistry》2012,65(5):407-415
The complexes [MI2(CO)3(NCMe)2] (M=Mo or W) react in CH2Cl2 at room temperature with two equivalents of 4,4'-diphenylenecarbonitrile (dpc) to afford the new seven-coordinate complexes, [MI2(CO)3(4,4'-dpc-N)2] (1 and 2) in good yield. Equimolar quantities of [MI2(CO)3(NCMe)2] and PPh3 give [MI2(CO)3(NCMe)(PPh3)], which react in situ with 4,4'-dpc to yield the mono-4,4'-diphenylenecarbonitrile complexes, [MI2(CO)3(4,4'-dpc-N)(PPh3)] (3 and 4). Treatment of the bis(alkyne) complexes, [WI2(CO)(NCMe)(η 2-RC2R)2] (R=Me and Ph) with one equivalent of 4,4'-dpc in CH2Cl2 at room temperature affords the acetonitrile displaced products, [WI2(CO)(4,4'-dpc-N)(η 2-RC2R)2] (5 and 6). Reaction of equimolar quantities of [WI2(CO)(NCMe)(η 2-PhC2Ph)2] and 2 in CH2Cl2 at room temperature gives the 4,4'-dpc-bridged complex, [WI2(CO){WI2(CO)3(4,4'-dpc-N)(4,4'-dpc- N,N')}(η 2-PhC2Ph)2] (7) in good yield. Similarly, equimolar amounts of [WI2(CO)(NCMe)(η 2-RC2R)2] (R=Me and Ph) and (4) react in CH2Cl2 to afford the bimetallic complexes, [WI2(CO){WI2(CO)(4,4'-dpc-N,N')(PPh3)}(η 2-RC2R)2] (8 and 9). The new bimetallic 4,4'-dpc-bridged alkyne complexes, [WI2(CO){WI2(CO)(4,4'-dpc-N,N')(η 2-MeC2Me)2}(η 2-MeC2Me)2] [(10), [WI2(CO){WI2(CO)(4,4'-dpc-N,N')(η 2-PhC2Ph)2}(η 2-PhC2Ph)2] (11) and [WI2(CO){WI2(CO)(4,4'-dpc-N,N')(η 2-MeC2Me)2}(η 2-PhC2Ph)2] (12) are also described. 相似文献
18.
SynthesisandStructureof[Et_4Nj]_2[Mo_6O_(19)H_4]andValenceDeterminationofMolybdenumNIUShu-yun;ZHANGHeng-bin;YANGGuang-di;NIEF... 相似文献
19.
Jun Min HUANG* Hui CHEN Ru Yu CHEN Institute of Elemento-Organic Chemistry National Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 《中国化学快报》2002,(2)
Organophosphorus compounds are ubiquitous in nature and they have broad applications in the fields of agriculture and medicine1-4. There has been a considerably growing interest in heterocyclic compounds due to their pharmaceutical importance and extensive application in organic synthesis, and the application of heterocycles is suggested to enhance the biological activity and/or offer other diverse properties5-7. In the previous work8, we have reported that 11-ethoxycarbonylmethyl-6-oxo-3, 4… 相似文献