One was HF/pyridine diazotization reaction at the 4-position of fluorene ring, and the other was Grignard reaction on the 9-position with Grignard reagent of pentafluorochlorobenzene.

使用HF/吡啶法在芴環(huán)的4位引入了氟原子在线欧美精品第一页，使用五氟氯苯格氏試劑在芴環(huán)的9位引入了全氟苯，合成了五個氟取代三聯(lián)(9十八岁免费看黄色视频，9-二苯基)芴化合物在线视频一区二区三区。

It is well known that the acetonitrile (CH_3CN) can form stable complex compound with boron halide (BF_3). The sample was complexed in a platinum crucible by acetonenitrile and dissolved by HF: HNO_3 (3:1) solution in a pressure sample dissolver at proper temperature.

基于硼的鹵化物(BF_3)能與乙腈(CH_3CN)形成穩(wěn)定的絡(luò)合物，將試樣置于鉑金坩堝內(nèi)加入乙晴作為絡(luò)合劑我想看黄色一级高清无码视频，用HF+HNO_3(3：1)在壓力溶樣器內(nèi)加溫溶解国产高清色色。

Different escharotic decide the different speed of reaction, thus to cause the great effect on stone carving speed, carving effect, for example, marble whose mainly component is carbonate, so it is better to choose escharotic made from HCI, while for granite , whose mainly component is silicate, it is better to choose escharotic made from HF

腐蝕劑類型的不同又決定了反應(yīng)速度的差異，進而對雕刻速度99riav1com、雕刻效果都會生產(chǎn)比較大的影響，例如九九久精品，以碳酸鹽為主要成分的大理石類石材中文字母强奸乱论，選擇由HCl配制的腐蝕劑比較適宜；而以硅酸鹽為主要成分的花崗石類石材cao96，選擇由HF配制的腐蝕劑比較適宜曰批全过程免费视频下载。

HF communication generally depends on the reflection of signals from the higher F layer and such signals must travel through the D layer at least twice.

HF 通信一般取決于信號的反射從更高的F 層數(shù)并且這樣信號必須游遍D 層數(shù)至少兩次。

Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

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To further explore the origin of the blue shift for C-H bond not directly participating in H-bond formation, we present a theoretical investigation on the complexes formed by formamide and small molecules such as HF et al.

為了進一步研究不直接參與氫鍵形成的C-H鍵藍移的起因欧美性爱A片免费看，我們對甲酰胺和HF等小分子形成的氫鍵復合物進行了理論計算研究。

Fluoride treatment included both excised leaves cultured in nutrient solutions and leaves from plants fumigated with HF.

氟化物處理既包括培養(yǎng)在營養(yǎng)溶液中的切離葉片和HF熏氣的植株上來的葉片黄片一级99。

The structures of furan-〓 and the vibrational frequency of O-H were investigated by use of HF and DFT methods.

用HF和B3LYP方法對呋喃-水團簇的結(jié)構(gòu)和團簇中水分子的O-H振動光譜進行了研究日韩精品第124页在线观看视频。

Applying atomic many-body theory to analyse the Goldston diagrams of effective Hamiltonian and wave operator about electron-electron correlation for open shell atoms, we use a simple method to evaluate the effective Hamiltonian and calculate the correlation effectes of Corbon with HFS model as a zeroth order approximation. Making contrasts with the experiment and the calculation based on HF model we get pleased results.

應(yīng)用原子多體理論對開殼層原子中電子關(guān)聯(lián)效應(yīng)的有效哈密頓量及波算符的Goldston圖進行了分析，在此基礎(chǔ)上得到了計算有效哈密頓量的簡單方法欧美不卡一区；以HFS模型為零級近似對中性碳原子基態(tài)的關(guān)聯(lián)效應(yīng)進行了計算并通過與實驗結(jié)果及其他文獻基于HF模型進行的計算相比較国产免费看黄色网站，得到了令人滿意的結(jié)論。

Chapter 5 covered the quantum chemistry study of the model molecule (410 atoms) of HupA- Acetylcolinesterase complex at HF/4-31G level with point charge model (1929 point charges) to simulate the environment effect on complex active site.

第五章：用HF/4-31G量子化學方法對單分子狀態(tài)石杉堿甲在线观看a片免费网站、活化狀態(tài)的石杉堿甲以及石杉堿甲-乙酰膽堿酯酶復合物的模型體系（410原子中国美女网站，1929個點電荷）進行了從頭計算研究，指認了對于形成穩(wěn)定復合物貢獻最大的石杉堿甲分子的基團和酶的氨基酸殘基黄色网址在线进，揭示了活性位點中水分子的重要作用www.樣。