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相关概念视频

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Introduction to Functional Groups02:08

Introduction to Functional Groups

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Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.  
Types of common functional groups
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Overview of Advanced Functional Groups02:22

Overview of Advanced Functional Groups

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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.
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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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新的功能组设计朝着高性能紫外线非线性光学材料.

Huixin Fan1, Ning Ye2, Min Luo1

  • 1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.

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|October 27, 2023
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概括

开发新的紫外线 (UV) 和深紫外线 (DUV) 非线性光学 (NLO) 晶体对于先进技术至关重要. 本研究提出了设计高性能NLO活性组的三种新策略,平衡了改善UV/DUVNLO材料的关键性质.

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科学领域:

  • 材料科学和光学 材料科学和光学
  • 固态化学 固态化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 第二阶非线性光学 (NLO) 晶体对于激光器和光学技术中的频率转换至关重要.
  • 现有的紫外线 (UV) 和深紫外线 (DUV) NLO晶体在满足先进的技术需求方面存在局限性.
  • 紫外线/DUV NLO 晶体的关键性质 较大的 NLO 系数,双折射和宽带间隙 经常发生冲突,阻碍了材料设计.

研究的目的:

  • 为满足对具有平衡性能特性的新型UV/DUV NLO晶体的迫切需求.
  • 介绍和评估设计高性能NLO-active功能组的三个不同的策略.
  • 引导探索新的有机-无机复合NLO材料,用于UV/DUV应用.

主要方法:

  • 使用"四面体部分替代"策略设计新的NLO活性组,修改传统的四面体单位.
  • 通过"结构-模拟"策略开发具有增强极化的有机功能群的异构性和超极化性.
  • 将平面三角形和四面体配置集成到"二合一"战略中,以创建多功能NLO-active组.

主要成果:

  • 成功设计和探索各种有机-无机复合NLO晶体材料,包括Ba(SO3CH3) 2,M(SO3NH2) 2 (M = Sr,Ba),C(NH2) 3SO3F,KLi(HC3N3O3) ·2H2O,以及KLi(C3H2O4) ·H2O.
  • 证明拟议的策略可以有效地平衡关键的NLO属性,如NLO系数,双断率和频段间隙.
  • 确定有前途的候选材料,用于UV和DUV区域的实际应用.

结论:

  • 这三种策略为设计高性能UV/DUV NLO活性组和材料提供了有效的途径.
  • 这些设计原则对于克服NLO基本属性之间固有的权衡至关重要.
  • 这些发现为未来研究和开发先进的UV/DUV NLO材料提供了基础.