噻吩基

As compared to the l max absorption of regioregular poly(3-alkylthiophene)s (RR-P3ATs), the red-shift about 120 nm for RR-P3ATVs resulted from the more coplanarity and the longer conjugation length due to the additional vinylene linkage introduced to the conjugated chains.

与立体规则性聚(3-烷基噻吩)(RR-P3ATs)比较， RR-P3ATVs 之 UV-vis 最大吸收波长约有120 nm 的红外移，显示共轭主链导入乙烯基后，有较佳的共平面性与较长的共轭长度。

Their chemical structures,optical properties and electroluminescence properties were concluded,the characteristics of different polythiophenes were discussed.

对它们的结构、光学性能、电致发光性能进行了归纳和总结，讨论了不同类聚噻吩的特点，对比了随取代基种类、位置及个数的不同其聚合物性能的优缺点，并对其研究和应用前景进行了展望。

A serial of novel thiophene-based main chain conjugated compound with varieties of aromatic rings and heterocycle, such as acenaphtenequinoxaline phenanthrenequinoxaline ,have been synthesized on the base of looking for lots of references and summarized others research work.

在查阅大量文献和综合前人所作工作的基础上，我们选择卤代芳烃与Sn金属有机试剂在Pd催化下合成了以萘基喹喔啉和菲基喹喔啉为主的一系列噻吩与杂环构成的交叉共轭化合物。

Several transient compounds were synthesized by the homo- and heterogeneous reactions of reactive halogen compounds, In-situ ultraviolet photoelectron spectroscopy and photoionization mass spectroscopy as well as theoretical calculations were used to study their molecular structures, stability and molecular orbital properties, their electronic structures and geometric structures were obtained for the first time; Simultaneously, the electronic structure and thermal dissociation of acetyl peroxynitrate and trifluoroacetyl peroxynitrate which have great importance in the atmospheric chemistry were studied; The substituent effects of series of halopyridines and halothiophenes were studied by the ultraviolet photoelectron spectroscopy method for the first time. The atmospheric chemical reaction between peroxyacetyl radicals with IO radicals as well as the dissociation of the most stable isomer of CH3COIO3 were calculated by density functional theory, it was found that the CH3COOIO2 isomer may be act as a new reservoir of inorganic iodine in the stratosphere.

通过活性卤素的系列均相与非均相化学反应合成了几种瞬态物种，采用原位紫外光电子能谱和光电离质谱结合量子化学理论计算对化合物的分子结构、稳定性以及分子轨道特性进行了研究，首次获得了这些物种的电子结构和几何结构的信息；同时研究了大气中有重要作用的乙酰过氧硝酸酯和三氟乙酰过氧硝酸酯的电子结构性质及热解过程；采用紫外光电子能谱手段首次研究了系列卤代吡啶和噻吩的取代基效应；通过量子化学理论计算研究了乙酰基过氧自由基与IO自由基的大气化学反应及其最稳定异构体CH3COOIO2的解离，发现该物种可能是无机碘化合物在平流层中的储库物种。

C〓 alkylthiophene from aromatic fraction of pyrolysates at 200℃ probably originated from the combination of phytol group of chlorophyll and organic surphur of algal cells.

盘星藻200℃热解产物芳烃组分中的C〓烷基噻吩可能是来源于叶绿素类的植醇基与来源于藻类体内的有机硫结合而形成。

The Staudinger reaction is one of the most important methods in synthesis of, 8-lactams. 3-(Thiophen-2-yl)-β-lactam is one class of important β-lactam derivatives.

Staudinger反应是合成β-内酰胺类化合物最重要的方法之一。3-（噻吩－2-基）井内酰胺是一类重要的β-内酰胺类衍生物。

At present, the industry widely used method hydrodesulfurization with a substituent of dibenzothiophene class of heterocyclic compounds of the desulfurization efficiency is very low.

目前，工业上广泛采用的加氢脱硫法对带有取代基的二苯并噻吩类杂环化合物的脱硫效率很低。

Cinnabarinus at 150 mg/L.The influences on bioactivity of substituted pyrazole and pyrimidine were discussed respectively: pyrazoles substituted with phenyls at 3 position had higher activity than thiophen and compounds with R_1=methyl had higher activity than that with R_1= hydrogen, pyrimidines substituted with methyl at 2 (R_3) and 5 (R_3) position and phenyl at 6 position were most active.

本论文对吡唑及嘧啶取代基对活性的影响分别进行了讨论，可知：吡唑3位为取代苯基的化合物杀菌活性优于取代噻吩的，吡唑4位(R_1)为甲基的杀菌活性高于R_1为氢的活性；嘧啶的2位(R_3)为甲基，5位(R_1)为甲基，6位为无取代基的苯基时活性最好。

Three series of donor-acceptorπ-conjugated molecules 1, 2, and 3 have been designed and synthesized with a N, N-dimethylamino, Julolidine group (2,3,6,7-tetrahydro-1H, 5H-pyrido[3, 2, 1-ij]quinolinyl), or N, N-diphenylamino group as the donor moiety, a phenylvinyl or thienylvinyl unit as the bridge, and a bromide or aldehyde group as the acceptor moiety.

本文设计并合成了1、2、3三个系列的D-π-A型化合物(Donor-Acceptorπ-conjugated compounds)，在化合物分子中引入久洛尼啶基团(2，3，6，7-tetrahydro-1H，5H-pyrido-[3，2，1-ij]quinolinyl)，N，N-二甲基氨基，或N，N-二苯基氨基为供电子基团，以苯乙烯基或噻吩乙烯基为桥链，以溴原子或醛基为吸电子基团。

Diamines are performed. An new and effective atom economy, domino reaction is developed, and 5, 6dihydro-4H-thieno [2, 3-b] thiopyran are synthesized by 4-(4-methyl-1, 3-dithiol-2-ylidene)-1, 7-diaryl-1, 6-diene-3, 5-dione

然后以4-[（4-甲基-1，3-二噻烷-2-亚甲基）-1，7-二芳基]-1，6-二烯-3，5-二酮类化合物为合成子探索稠杂环合成方法，并发现一个高效的，具有原子经济性的多米诺效应合成方法，并成功的利用其合成了一系列噻喃并噻吩衍生物。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。