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相关概念视频

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

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Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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基拉单元驱动的短波紫外线非线性光学酸盐具有平衡的整体光学特性.

Zi-Xuan Zhao1, Wei Chen1, Hui-Yan Zhao2

  • 1College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, P. R. China.

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PubMed
概括

研究人员开发了用于短波紫外线非线性光学 (NLO) 应用的新型性酸盐. 这些材料提供了大二和弦生成 (SHG) 和中度双断的平衡,这对于先进的光学设备至关重要.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 光学是什么?光学是什么?光学是什么?

背景情况:

  • 开发短波紫外线 (UV) 非线性光学 (NLO) 晶体需要平衡较大的第二和弦生成 (SHG) 系数,中等的双折射率和宽带间隙.
  • 现有的NLO材料往往很难实现这种最佳的特性组合.

研究的目的:

  • 合成和描述具有作为短波UVNLO晶体潜力的新型极性酸盐.
  • 调查管理其NLO业绩的结构-财产关系.

主要方法:

  • 合性酸盐的合成 R-/S-(C5H14N2)(CH3COO) 2.
  • 测量第二生成 (SHG) 系数和双断率.
  • 紫外线切断边缘的确定.
  • 希尔什菲尔德表面分析.
  • 理论上的计算. 理论上的计算.

主要成果:

  • 合成的酸盐表现出平衡的NLO特性:SHG反应为1.5/1.4 × KH2PO4 (KDP),中等双断率 (0.0871/0.0838@546 nm) 和200 nm以下的紫外线切断值.
  • 与相关的酸盐相比,这些酸盐显著增强了SHG (3.0/2.3倍) 和双断率 (7.9/7.0倍).
  • 希尔什菲尔德的分析强调了键在指导同体基质结构中的作用.

结论:

  • 这种新型的性酸盐是短波UVNLO应用的有希望的候选者.
  • 将奇拉群与NLO活性氧化离子结合起来,是设计新的UV NLO晶体的有效策略.
  • 了解结相互作用是控制晶体结构和NLO特性的关键.