通过协调诱导的非结合电子的局部化最大化第二和生成反应
Jia-Xiang Zhang1,2,3, A-Lan Xu1,2, Yang Chi4
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Fuzhou 350002 China linhua@fjirsm.ac.cn qlzhu@fjirsm.ac.cn.
Chemical science
|November 26, 2025
概括
研究人员开发了一种新方法,通过定位非结合电子来提高非线性光学 (NLO) 晶体的效率. 这导致KBiP2S6,硫化物具有创纪录的第二和生成 (SHG) 性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 晶体学 晶体学是指结晶学.
背景情况:
- 在激光频率转换方面,开发具有强大的第二和生成 (SHG) 的非线性光学 (NLO) 晶体至关重要.
- 尽管在原子层设计方面做出了努力,但化物NLO材料显示出有限的SHG反应,通常低于3 × AgGaS2.
- 调节非结合电子可以改善NLO特性,但通过定位这些电子来最大限度地提高SHG的策略尚不发达.
研究的目的:
- 探索NLO晶体中协调数,非结合电子定位和SHG性能之间的关系.
- 设计和合成具有增强SHG反应的新型石化物质材料.
- 阐明这些材料中SHG的电子起源,并挑战现有的模型.
主要方法:
- 理论原理:减少协调数增强了非结合电子定位和SHG.
- 合成KBiP2S6 (P21,没有. 4) 水晶. 在水晶.
- 原子空间模块化分析和对称性分析以确定SHG贡献和有利的晶体对称性.
主要成果:
- 迄今为止,KBiP2S6在硫化物中表现出最高的SHG反应,达到15 × AgGaS2.2.
- 原子空间模块化分析表明,硫 (S) 贡献了大约75%的SHG,主要来自局部S-3p非结合电子.
- 这一发现挑战了传统模型,这些模型强调立体化学活性单一对 (SCALP),忽视了硫的作用.
- 极性螺丝轴对称性被确定为高SHG SCALP基石化素的有利条件.
结论:
- 减少协调数是一种有效的策略,用于局部化非结合电子和增强NLO晶体中的SHG.
- 该研究强调了硫的非结合电子在驱动SHG中的主导作用,需要对当前的理论框架进行修订.
- 这项工作将NLO材料设计转向电子级工程,为先进的高性能NLO材料铺平了道路.
相关概念视频
02:42Valence Bond Theory
11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
02:45Valence Bond Theory
49.3K
Overview of Valence Bond Theory
49.3K
03:35Hybridization of Atomic Orbitals II
47.6K
sp3d and sp3d 2 Hybridization
47.6K
02:16Resonance and Hybrid Structures
24.8K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
24.8K
03:51Molecular Orbital Theory II
26.8K
Molecular Orbital Energy Diagrams
26.8K
03:02Colors and Magnetism
13.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.9K