The factors such as conjugate framework withsmall conjugation energy, central asymmetry, long conjugate chain,introduction of electron donors-acceptors, strong electron-donating orelectron-withdrawing abilities, long distance between electron donors andelectron acceptors, good coplanarity and so on lead to high third-order optical nonlinearities.

離域能小的共軛骨架，非中心對(duì)稱結(jié)構(gòu)97人妻a，長的共軛鏈日韩欧美亚洲视频在线，吸供取代基的引入，取代基強(qiáng)的供電子性或吸電子性国产麻豆日韩在线观看网站免费，長的吸供電子取代基之間的距離黄页网站免费观看的视频高清，以及良好的共平面程度等因素有利于獲得較大的三階非線性光學(xué)性能。

According to the synthetic methods study of the quinolones, it is found that the synthetic method of parent ring is of wide use by the condensation from α-substituted aryl formyl-β-substituted aminoacrylic acid and the inner molecular nucleophilic substitution reaction, which is almost suitable for the quinolones preparation of different rings or different substituted groups in 〓-position.

然后47pao强力打造免费视频，對(duì)其合成方法進(jìn)行了歸納啊啊啊作爱免费视频暴，發(fā)現(xiàn)：由α-取代芳甲酰基-β-取代氨基丙烯酸縮合台湾AV国片精品偷拍，經(jīng)分子內(nèi)親核取代反應(yīng)形成喹諾酮母環(huán)的合成方法用途非常廣日韩一区美女在线观看，幾乎適用于所有不同環(huán)系或〓-位是不同取代基的喹諾酮類衍生物的制備。

Experimental results show that the different substituted location and different substituted group on benzene cycle would result in the diversity of reduction properties of substituted aryl nitrobenzene. Substituted nitrobenzenes with withdrawing group will be reduced at more positive potential, while those with repelling group will be reduced at more negative potential. In addition, the reduction potential of nitro group of o-nitrobenzene shifts more negative due to the effect of space resistance.

結(jié)果表明外国操逼视频网站，芳族硝基化合物在苯環(huán)上的取代基位置不同以及在相同位置上取代基的種類不同均可使各芳族硝基化合物的電還原性能發(fā)生較大差異：吸電子取代基在電還原過程中電位較正免费乱伦av，推電子取代基的電還原電位較負(fù)：鄰位取代基在反應(yīng)過程中由于空間位阻效應(yīng)，苯環(huán)上的硝基在電還原時(shí)電位往負(fù)方向移動(dòng)黄大片视频在线观看大片。

The results indicate that the type and number of the substituents affect the toxicity of these compounds directly. A nitro group substitution increases the toxicity of the compounds, and on the contrary, an amido group substitution decreases their toxicity. For multi-nitrobenzenes, the toxicity of the o - or p -substituted nitrobenzene is bigger than that of the m -substituted one.

苯環(huán)上取代基的類型精品国产群3p在线交换、數(shù)目和取代位置直接影響到標(biāo)題化合物的毒性大小，強(qiáng)吸電子基如硝基會(huì)降低 Q -NO2和 E LUMO大小A片视频在线观看免费大全，使化合物毒性增強(qiáng)黄色网站直接观看，且鄰對(duì)位硝基取代的毒性高于間位取代；相反97人在线看视频在线观看，給電子基團(tuán)氨基的存在則會(huì)使化合物的毒性降低歐美人性爱黄色视频。

The B3LYP/6-31G calculations on the four complexes show that the largest interaction energy is-13.98 kJmol^(-1) in the complex composed of HMX and hexaazacalix [3]-p-triarene [3]-2-amido-1, 3, 5-triazine. Results show that intermolecular interaction energies of azacalix [6] arenes with substituted groups are stronger than that without substituted groups, and intermolecular interaction energies of azacalix [6] arenes with amido groups are stronger than that with nitryl groups.

研究發(fā)現(xiàn)分子間相互作用能最大的復(fù)合物是六氮雜杯[3]-對(duì)－三芳烴[3]-2-氨基－1，3综合视频区，5-三嗪與HMX所形成的復(fù)合物亚洲三级网站，最大相互作用能為－13.98 kJmol^(-1)；而且?guī)в?strong>取代基的復(fù)合物的相互作用能大于沒有帶取代基的復(fù)合物欧美精品九九99久在免费线，帶有氨基取代基的復(fù)合物的相互作用能大于帶有硝基取代基的復(fù)合物男人天堂网址网站。

The value of current density and the apparent active energy of electroreduction of substituted nitrobenzene depend on the electronic effect of substituted group and space resistance. o,m,p-chloronitrobenzene will be electroreduced to azoxy compounds by taking three electrons, o,m-nitrotoulene and o,m-nitrobenzoic acid will be reduced to phenol compounds by taking four electrons, and p-nitrotoulene will be reduced to the aniline by taking six electrons. According to these results, the electroreduction mechanism of the substituted aryl nitro-compounds was studied in detail.

在電還原過程中，還原峰電流和表觀活化能的大小均與取代基的電子效應(yīng)和空間位阻相關(guān)二级黄绝大片免费视频，同時(shí)取代硝基氯苯得3個(gè)電子將還原生成氧化偶氮苯類化合物：鄰中文字幕日韩欧美在线、間硝基甲苯、硝基苯甲酸得4個(gè)電子將還原生成酚類化合物一到本高清欧美在线视频；對(duì)硝基甲苯得6個(gè)電子將還原生成胺類化合物亚洲欧美日韩久久综合，在此基礎(chǔ)上人妻无码伊人，探討了各芳族硝基化合物的電還原機(jī)理。

Electron donating substituent CH〓, OCH〓 and 4, 5-benzo make λ〓 red shift, electron with -drawing substituent F, Cl and CF〓 make λ〓 hypsochromic shift; b The W〓 is bigger than relative symmetrical carbocyanines, and the ratio of 0-1＇ and 0-0＇ transition intensity increase with the increase of σ〓; c The absorption and the fluorescence spectra are mirror image, and the λ〓 have a good linear relationship; d The Stokes shift △λ〓 and the Hammett σ〓 constant have a good linear relationship.

研究了染料的光物理性質(zhì)欧美综合亚洲日韩精品别内，①苯環(huán)上取代基影響染料的λ〓和摩爾消光系數(shù)AAA免费黄色视频，相對(duì)于H，給電子取代基CH〓欧美一区1080P、OCH〓一级做a爰片久久毛片首页、4，5-benzo使λ〓紅移日韩无码黄片，摩爾消光系數(shù)減小还能看的黄色网站，吸電子取代基F、Cl18岁禁看网站免费观看、CF〓使λ〓藍(lán)移(涩涩视频)色黄，摩爾消光系數(shù)減小自拍偷拍精品视频网；②化合物吸收峰的半峰寬較相應(yīng)的對(duì)稱染料的大日韩色色色一区二区电影，且振動(dòng)肩部與最大吸收峰的強(qiáng)度比隨σ〓增大而增大；③吸收光譜與熒光光譜呈鏡像關(guān)系激情毛片免费看，且λ〓與λ〓呈良好的線性關(guān)系先锋影音一区二区；④化合物的Stokes位移△λ〓與取代基的Hammett σ〓常數(shù)呈線性關(guān)系。

It can be proposed that when the substituent is an electron donor, the twisted configuration between pyrazoline ring and the moiety attached on N1 is the fluorescence-emitted configuration of 2-pyrazoline, and the configuration where two moieties are placed in a co-plane is the best non-radiative decay configuration of these compounds.

這表明久久公开免费视频观szs，對(duì)于C3位取代基為推電子基或弱的拉電子基團(tuán)的化合物欧美老妇老熟妇性性性，N1所聯(lián)取代基與吡唑啉環(huán)相扭曲的構(gòu)象是化合物的發(fā)光構(gòu)象，兩者處于同一平面的構(gòu)象是化合物的最佳非輻射衰變構(gòu)象亚洲一级精品A片免费视频，與C3所聯(lián)取代基的旋轉(zhuǎn)扭曲無關(guān)正在播放国产一区二区中文。

The results showed that the MS2 fragmentation pathways of DASSSB were affected by the character and position of substitutes on salicylidene phenyl. The C=N cleaving to form fragmentation ion [M+H-283](superscript +) was dominant for DASSSB compounds with electron-donating group on the C4 of the salicylidene phenyl; while fragmentation ion [M+H-254] (superscript +) forming by C-C cleavage of the β-position of C=N was dominant for DASSSB compounds with electron-withdrawing group on the C5 of the salicylidene phenyl.

結(jié)果顯示，這些化合物的ESI-MS/MS裂解方式與它們分子中水楊醛苯環(huán)上取代基的性質(zhì)和位置有關(guān)：當(dāng)水楊醛苯環(huán)上4位連接供電子取代基時(shí)一级A片免费天天噜，分子以CN雙鍵斷裂為主色色五月黄片免费看，生成[M+H-283]碎片離子；當(dāng)水楊醛苯環(huán)上5位連接吸電子取代基時(shí)欧美亚洲日韩国产精品第6页，分子以CN雙鍵β位的C-C鍵發(fā)生斷裂為主日韩精品短片影院在线播放视频免费，生成[M+H-254]碎片離子。

The results of calculation will be fundmentally consistent with the experimental values.In addition, we calculated dibenzene chromium and its derivatives, ferroceneand its derivatives. The former had higher symmetry. We studied the substituenteffects by calculating their NMR spectra. The results show that: when we add asubstitute group on one ring of dibenzene chromium, the substitute group will affecttwo benzene rings. The effect is similar to the effect of branched alkanes, namely:the effect on neighbouring groups has transmissibility. Furthermore, the nearer theneighbouring group is, the stronger the effect is. This effect is observed not only onthe substituted ring, but also on the unsubstituted ring.

此外日夲一级片，我們重點(diǎn)計(jì)算了二苯鉻及其衍生物和二茂鐵及其衍生物的核磁共振譜你懂得手机在线播放，其中二苯鉻及其衍生物選擇的是對(duì)稱性較好的體系，通過計(jì)算其核磁共振四川師范大學(xué)碩士學(xué)位論文譜国产成长精品视频，探討其取代基效應(yīng)在线儿播放你懂的，結(jié)果表明：在二苯鉻的一個(gè)環(huán)上引入取代基后，取代基對(duì)兩個(gè)苯環(huán)的影響亚洲激情视频网，類似于支鏈院烴引入取代基后的影響：即對(duì)鄰近基團(tuán)的影響有傳遞性九九色九九精品视频，并且對(duì)離得近的作用強(qiáng)，對(duì)離得遠(yuǎn)的作用弱日本女色视频，這種作用不僅體現(xiàn)在連有取代基的環(huán)上91亚洲第一精品，也體現(xiàn)在沒有帶取代基的環(huán)上。

allyl：烯丙基

在具有剛性結(jié)構(gòu)的嗎啡91av视频在线观看网站、嗎啡喃類、苯嗎喃類在线观看视频黄页、14-羥基二氫嗎啡酮等分子中,將氮原子上的甲基以3~5個(gè)碳的取代基,例如:烯丙基(allyl),環(huán)丙烷甲基(cyclopropylmethyl,CPM)或環(huán)丁烷甲基(cyclobutylmethyl,CBM)等取代,

Cherokee：切諾基

吉普有"牧馬人"(Wrangler)及"切諾基"(Cherokee)兩大品牌. 到現(xiàn)在"吉普切諾基"在美國已經(jīng)被"吉普.自由"所取代,現(xiàn)在吉普的主要產(chǎn)品為 "牧馬人"."自由"."大切諾基".

isopropyl：異丙基

產(chǎn)生甲基磷酸異而二酯,之后再與氟化氫(hf)反應(yīng)產(chǎn)生沙林(甲基氟膦酸異丙酯),這一類的有機(jī)磷化合物,隨著接在磷上取代基稍微改變就可以決定此有機(jī)磷是否有毒性,見表一,由研究顯示,一般在磷上,如果同時(shí)接上異丙基(isopropyl)與氟(fluorine),

leaving group：脫離基

在有機(jī)及無機(jī)化學(xué)中,親核取代為取代反應(yīng)的一種基本型式,其中富含電子的親核試劑(nucleophile)攻擊接有脫離基(leaving group)的原子,此種帶有脫離基為帶正電或帶部分正電的原子或原子團(tuán),又稱為親電子試劑(electrophile).

modified starch：改性淀粉

改性淀粉(Modified starch)又稱變性淀粉,是利用物理欧洲视频一区二区三区、化學(xué)或酶的手段,通過分子切斷、重排国产精品亚洲日韩欧美第一页、氧化或在分子中引入取代基的方法以改變其某些天然性質(zhì),增加其性能或引進(jìn)新特性,制得的較原淀粉具有更優(yōu)良的性能和更繁多品種的淀粉衍生物,

substituting agent：取代劑

substituted 取代的;代替的 | substituting agent 取代劑 | substituting group 取代基

amido：酰胺基

一種反應(yīng)性染料組合物及其應(yīng)用,此反應(yīng)性染料組合物包含(a)至少一種如右式(1)所示含有酰胺基(amido)取代基的反應(yīng)性紅色染料,其中R一级a毛片免灵靠看久久精品、R↓[1]、R↓[2]国产原创自拍、R↓[3]黄色视频一区二区观看、X及Q定義如說明書所示;

cholesteryl：膽固醇基

由于脂溶性光敏劑易于被血清中的低密度脂蛋白結(jié)合而利于運(yùn)輸和被腫瘤細(xì)胞吸收, 因此Barge et al[16]利用脂類取代基如膽固醇基(cholesteryl)和辛氧基(octyloxy)與光敏劑SiPc作用合成新的SiPc衍生物(Chol-O-SiPc和Octo-O-SiPc),

phytyl：植基

其它含有蒈烷、蒎烷或菠烷環(huán)狀骨架的烴按照規(guī)則F-4.2命名. A-75.1:簡單的無環(huán)萜基的命名和編號(hào)是根據(jù)規(guī)則A-3.5進(jìn)行. 俗名牦牛兒基(geranyl)一级α片屄、橙花基(neryl)欧美精品黄一区、里哪基(linalyl)和植基(phytyl)均予以保留,用以指這些未被取代的基.

porphine：卟吩

卟啉(Porphyrins)是卟吩(Porphine)外環(huán)帶有取代基的同系物和衍生物的總稱. 卟啉化合物在自然界廣泛存在,由于卟啉化合物具有獨(dú)特的結(jié)構(gòu)及性能和特殊的生理活性,使得卟啉化合物在醫(yī)學(xué)、生物化學(xué)操干无码在线视频、材料化學(xué)很在线视频无码一二三四区、合成化學(xué)、能源利用等很多方面具有良好的應(yīng)用前景,