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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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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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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Deep-Ultraviolet Nonlinear Optics in a Borate Framework with 21-Ring Channels.

Qi Wei1, Jia-Jia Wang1, Chao He2

  • 1MOE Key Laboratory of Cluster Science, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China), Fax: (+86)10-6891-8572.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 2, 2016
PubMed
Summary

A novel borate material, LiBa3(OH)[B9O16][B(OH)4], exhibits uniform porosity and strong nonlinear optical (NLO) properties. This deep-UV NLO material shows a high second harmonic generation (SHG) intensity, making it promising for advanced optical applications.

Keywords:
UV nonlinear opticsborateshydrothermal synthesisoxoboron clustersstructure-property relationships

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid State Chemistry

Background:

  • Borate materials are known for their excellent nonlinear optical (NLO) properties.
  • Open-framework materials offer unique structural characteristics, including porosity.
  • Combining these properties in a single material is highly desirable for advanced applications.

Purpose of the Study:

  • To synthesize a novel borate material incorporating both porosity and NLO characteristics.
  • To investigate the structural, optical, and NLO properties of the new compound.
  • To evaluate its potential as a deep-ultraviolet (deep-UV) NLO material.

Main Methods:

  • Hydrothermal synthesis using mixed lithium and barium ions as templates.
  • X-ray diffraction for structural analysis.
  • Second harmonic generation (SHG) measurements.
  • UV/Vis-NIR diffuse reflectance spectroscopy.

Main Results:

  • A new borate, LiBa3(OH)[B9O16][B(OH)4], was successfully synthesized.
  • The framework exhibits an acs-type net with large 21-ring channels, indicating uniform porosity.
  • The material demonstrated type I phase-matchable NLO properties with an SHG intensity 3.1 times that of KDP.
  • It possesses a wide transparency range with a short-wavelength absorption edge below 200 nm.

Conclusions:

  • The synthesized borate material successfully combines porosity and strong NLO properties.
  • Its deep-UV transparency and high SHG efficiency make it a promising candidate for deep-UV NLO applications.
  • This discovery opens new avenues for designing functional borate-based materials.