covalent crystal

Covalences of Be in [MeBe(C≡CMe) NMe_3]_2, [Be(C≡C R)_2]_n, [MeBeH·NMe_3]_2 and (BeH_2)_n;

炔烃桥和氢桥铍化合物中铍原子的共价

Covalence of Be in Dimethylberyllium;

二甲基铍中铍原子的共价

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。

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。

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。

Non-covalent bond based self-assembly organic functional materials;

非共价键自组装有机功能材料

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。