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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
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在部分化中红外氧化物RbTeMo2O8F中巨大的第二子生成响应和大频段差距

Yilei Hu1, Chao Wu1, Xingxing Jiang2

  • 1China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China.

Journal of the American Chemical Society
|August 9, 2021
PubMed
概括

这项研究引入了RbTeMo2O8F,一种新的化材料. 它实现了巨大的第二和生成 (SHG) 和宽带间隙,对于先进的非线性光学应用至关重要.

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科学领域:

  • 材料科学
  • 固态化学
  • 非线性光学

背景情况:

  • 优化非线性光学 (NLO) 材料需要平衡强的二次波生成 (SHG) 和宽带间隙,这往往是相互冲突的特性.
  • 开发实用的NLO材料需要探索新的化学成分和结构.

研究的目的:

  • 报告一种新的d0过渡金属矿的合成和特征,RbTeMo2O8F.
  • 调查其非线性光学特性,特别是其第二声波生成 (SHG) 响应和带隙.
  • 阐明其增强的NLO性能的结构来源.

主要方法:

  • 合成的五RbTeMo2O8F.
  • 使用1064和2100nm激光辐射测量第二波生成 (SHG) 响应.
  • 确定带间隙,光学透明度和双断.
  • 理论计算和晶体结构分析.

主要成果:

  • RbTeMo2O8F表现出巨大的SHG反应 (27xKDP,2.2xKTP),是金属矿中最大的.
  • 该材料具有很大的带间隙 (3.63 eV) 和宽的光学透明度窗口 (0.345.40 μm).
  • 观察到显著的双折射 (Δn = 0. 263 在 546 nm).
  • 理论分析将SHG增强归因于极化[MoO5F]/[MoO6]八面体和[TeO4]多面体的均对齐,由替代引起.

结论:

  • RbTeMo2O8F是第一个具有部分化八面体的d0过渡金属,显示出优异的SHG性能.
  • 在[MoO6]八面体中部分替代是实现增强SHG和有利光学性能的关键.
  • 这一发现为设计高性能NLO材料开辟了新的途径.