相关实验视频
Updated: Jun 16, 2026
10:17
20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
一种强大的二生成材料Cd4BiO(BO3) 3来自3染色体不对称结构的3染色体
Wei-Long Zhang1, Wen-Dan Cheng, Hao Zhang
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Mater, the Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
Journal of the American Chemical Society
|January 22, 2010
概括
一个新的非线性光学晶体,Cd(4) BiO(BO(3)) ((3),由于其独特的不对称结构,表现出大量的第二波生成 (SHG) 效应. 由于其相匹配性和热稳定性,这种材料对工业应用具有前景.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 非线性光学 (NLO) 材料对于光通信和激光系统等技术至关重要.
- 酸盐系统是NLO材料的重要类别,但优化其性能仍然是一个活跃的研究领域.
- 了解晶体结构和NLO反应之间的关系是设计先进材料的关键.
研究的目的:
- 为了合成和描述一种新的非线性光学晶体,Cd(4) BiO(BO(3)) ((3).
- 为了调查其大型NLO响应的起源.
- 评估其实际应用的潜力.
主要方法:
- 晶体制备的流量方法.
- 单晶X射线衍射用于结构确定 (空间组Cm).
- 理论计算 (状态密度,电子密度差异图).
- 对NLO属性的实验测量 (SHG效应,相匹配性,热稳定性).
主要成果:
- 成功合成了具有新型结构的CdO (n),BiO (n) 和BO (n) 组的CdO (n),BiO (n) 和BO (n) 组的CdO (n),BiO (n) 和BO (n) 组.
- 在已知的酸盐系统中观察到最大的NLO系数,用于此材料.
- 强烈的NLO反应归因于不对称染色体的合作效应,其中包括Cd(2+) 位移,Bi(3+) 单一对和BO(3) pi移位.
- 证明了大量的第二波生成 (SHG) 效应,相位匹配性和高热稳定性.
结论:
- Cd(4) BiO(BO(3)) ((3) 是一个有前途的新型非线性光学材料.
- 它卓越的NLO性能源于其独特的不对称结构中的协同相互作用.
- 该材料的有利性质表明了工业生产和应用的巨大潜力.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
01:13¹H NMR: Complex Splitting
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
02:05Prochirality
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...