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1)  bond angle of covalent bond
共价键键角
2)  length of covalent bond
共价键键长
3)  bond energy of covalent bond
共价键键能
4)  covalent bond
共价键
1.
This pa per mainly sums up the formation conditions of different type covalent bonds, it s effects on the quality of compounds and its change rule in element periodic ta ble.
无机化学中常见共价键有双电子σ键(包括σ配键)、双电子π键、单电子键、三电子键、离域π键、多中心键、反馈π键(包括d-pπ键、d-dπ键和π←dπ键)等。
2.
The result showed that Si--Si covalent bond eAsts in the melt of eutectic and hyper--eutectic alloy and Sr has capability to weaken the coto bond.
结果表明,在共晶及过共晶的合金的液态结构中,存在着Si—Si共价键,Sr有削弱这些共价键的倾向。
3.
Through analysis of four methods for estimation of the percentage of partial ionic property of the two elements in covalent bond,we found the way for estimation of partial ionic property as a new supplemenl to the method for estimation of the percentage of the partial ionic properties by the strength of electronega tivity.
通过对四种估算二元异原子共价键的离子性百分数的方法讨论,初步找到估算共价键的部分离子性的思路和方法。
5)  non-covalent bond
非共价键
1.
Non-covalent bond based self-assembly organic functional materials;
非共价键自组装有机功能材料
2.
The development of photoluminescent materials was reviewed in thisdissertation, and we designed a novel non-covalent bond self-assembled “molecularduplex” with photoluminescent group.
本文综述了有机光致发光材料的研究现状,设计了一种新的非共价键自组装“分子双股”,通过酯基引入 1,8-萘酰亚胺发光片段对“分子双股”进行功能化。
6)  strong covalent bond
强共价键
1.
Through comparing the valence electron structure in austenitic crystal cell among all kinds of alloys,the strong covalent bond of austenitic crystal cell valence electron structure is thought as a main factor to influence the stability of austenite.
对各种合金奥氏体晶胞价电子结构进行比较后,认为影响合金奥氏体稳定性的主要因素是奥氏体晶胞价电子结构的强共价键。
补充资料:共价键键角
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性质:共价键的重要特点之一是具有方向性,即一个原子与周围原子形成的共价键之间有一定角度,称之为键角。例如,弯曲形的水分子,键角为104.5°;氨分子是呈三角锥形,键角为107.3°;甲烷分子呈四面体形,键角为109.5°。键角是分子的基本构型参数之一,它同键长等参数共同决定分子的几何构型,进而影响分子的性质。一般地,含重键(双键或三键)的键角较大,单键间的键较小。对同一原子,若其配位原子的电负性大,则形成的键角较小,如NF3(102.1°)、NH3(107.3°)。若配位原子相同,则键角随中心原子电负性的减小而变小,如NH3(107.3°)、PH3(93.3°)、AsH3(91.8°)等。

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