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oh-bond
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  “oh-bond”译为未确定词的双语例句
     IAS DETERMINATION OF THE ORIENTATION OF OH-BOND AXIS IN LAYER SILICATES
     用红外吸收光谱确定层状硅酸盐中羟基键的方向
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  相似匹配句对
     OH.
     OH。
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     OH.
     OH的影响.
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     The activity of OH-.
     OH.
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     OH and O2-.
     OH和O2-.
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     Bond and Life
     债券人生
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  oh-bond
The Fe3+-OH- bond is more ionic, and has a smaller spinpolarization, then the Fe3+-O2- bond.
      
This theory is based on the assumption that each OH-bond dipole of a water molecule, centred in a quasistatic tetrahedron of water molecules, librates in the potential well produced by the ?internal? electric field of the water molecule dipoles.
      


By means of CNDO/2 and ab initio(STO - 2G) methods, we have calcula-ted the energies of systems R-N ≡ C…H-O-R'. The results of calculation confirm the formation of rather strong hydrogen bonds between isonitriles and hydroxyl compounds, as indicated by experimental evidences. The calculated hydrogen bond energies vary with the same tend as the red shift of IR spectra of the OH bonds. The relative stability of the H bond formed by isonitrile and nitrile is also discussed.

用自洽场分子轨道法(CNDO/2,ab initio)研完了异腈与羟基化合物的氢键体系(R—N≡C…H—O—R')。计算结果指出,异腈与羟基化合物之间可以形成相当强的氢键,该体系氢键键能的减弱与OH键的伸缩振动红外光谱的红移有明显的平行关系。根据计算结果,讨论了异腈和腈形成氢键的相对稳定性。

Samples of layer silicates have been selected for infrared dichroic study. When the electric vector of radiation makes an angle with the direction of transition moment of vibration, the absorption is proportional to the angle. Thus, the maximum absorption occurs when the transition moment of certain vibration and the electric vector are parallel. Zero absorption will occur when the two vectors are perpendicular to each other. In micas and related crystals, it is observed that the intensity of OH vibration of...

Samples of layer silicates have been selected for infrared dichroic study. When the electric vector of radiation makes an angle with the direction of transition moment of vibration, the absorption is proportional to the angle. Thus, the maximum absorption occurs when the transition moment of certain vibration and the electric vector are parallel. Zero absorption will occur when the two vectors are perpendicular to each other. In micas and related crystals, it is observed that the intensity of OH vibration of the inclined OH groups in the dioctahedral compositions remains unchanged with the variation of the electric vector. In contrast with those perpendicular to the cleavage plane-oriented octahedral OH groups in the trioctahedral compositions, a large increase is shown in intensity when the direction of the lamellae-oriented particles changes. From this can be obtained the orientation of OH-bond axis in layer silicates, from which some valuable information can be developed on crystal structure analyses.

层状硅酸盐样品用于红外二色性研究,当射线的电场矢量与振动的偶极矩方向成一角度时,这吸收与角度成比例,当某振动的偶极矩与电场矢量平行时,产生最大吸收,而这两矢量彼此垂直时将不产生吸收。在云母和有关晶体中可看到,在二八面体组成中,在改变电场矢量时倾斜OH团的OH振动强度保持不变,而与在三八面体组成中垂直于解理面方向的八面体OH团相比,当层状定向颗粒方向改变时显示强度大大增加,由此能获得层状硅酸盐OH键的方向,在晶体结构分析中能提供有价值的信息。

The adsorption and reaction of CO and H_2O on Ni catalyst were studied using infrared spectroscopy. Some valuable results were obtained. 1. Adsorption of H_2O and CO Two types of adsorbed CO on Ni catalyst were identified by IR spectroscopy, the linear state (2060 cm~(-1)) and bridged state (1960 cm~(-1)).Above 200℃, disproportionation reaction of CO could occur, forming CO_2 and surface carbon. A wide absorption band at 3600—3100 cm~(-1) was observed when H_2O was adsorbed on the catalyst. The band belongs...

The adsorption and reaction of CO and H_2O on Ni catalyst were studied using infrared spectroscopy. Some valuable results were obtained. 1. Adsorption of H_2O and CO Two types of adsorbed CO on Ni catalyst were identified by IR spectroscopy, the linear state (2060 cm~(-1)) and bridged state (1960 cm~(-1)).Above 200℃, disproportionation reaction of CO could occur, forming CO_2 and surface carbon. A wide absorption band at 3600—3100 cm~(-1) was observed when H_2O was adsorbed on the catalyst. The band belongs to the stretch-vibration of OH bond. The bent-vibration band of H_2O disappeared when it was adsorbed on the catalyst. This result showed that H_2O was dissociated into OH and H on the catalyst. The wave number of adsorbed H_2O was lower than that of gas phase H_2O, but was equal to that of liquid H_2O. This implys that the hydrogen-bond formed between adsorbed OH. When H_2O was preadsorbed, the absorption band of bridged state CO gave a red shift about 30cm~(-1), and the band of linear state CO almost disappeared. This means that the C-O bond of adsorbed CO was weakened by H_2O. 2. Reaction of CO with Preadsorbed H_2O Above 200℃, CO could react with preadsorbed H_2O, forming CH_4 and CO_2. It was found that only bridged state CO existed, no linear state CO formed when the reaction proceeded. 3. Reaction of H_2O with surface carbon The surface carbon formed by disproportionation of CO at 400℃ could react with H_2O at 100℃. CH_4 and CO_2 were produced. This reaction was different from that between CO and H_2O which could proceeded only above 200℃ .It shows the surface carbon with H_2O more easily, indicating that the surface carbon is an intermediate species of shift-methanation reaction. The bridged state CO was formed when surface carbon reacts with H_2O. When a large amount of surface carbon was accumulated on the catalyst surface, neither bridged nor linear CO was detected, this implied that the Ni atoms on the surface were all covered by carbon. The catalyst still had good catalytic activity.This result indicates a posibility that the surface carbon itself is an active center.

本文运用红外光谱研究了CO和H_2O在Ni基催化剂上的吸附和反应规律。证实了H_2O在催化剂上是解离吸附,以OH的形式吸附在催化剂上,在OH之间可能有氢键形成。CO有两种吸附态:线式和桥式。预吸附H_2O使CO线式吸附态几乎消失,桥式吸附峰红移了约30cm~(-1)。在不同温度时,对比了CO或表面碳与H_2O的反应,发现表面碳更容易同水反应生成甲烷。

 
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