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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Related Experiment Video

Updated: Jun 12, 2025

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Realizing Excellent Infrared Nonlinear Optical Performance in Eu-Based Chalcogenides via Rational Cross Substitution

Ping Feng1,2,3,4, Sheng-Hua Zhou1,5, Bing-Xuan Li1,2

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.

ACS Applied Materials & Interfaces
|September 23, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed new noncentrosymmetric (NCS) europium (Eu)-based chalcogenides, EuZnSiS₄ and EuCdSiS₄, overcoming limitations of narrow band gaps in infrared nonlinear optical (IR-NLO) materials. These novel compounds exhibit enhanced laser-induced damage thresholds (LIDTs) and strong second-harmonic generation (SHG) properties.

Keywords:
Eu-based chalcogenidescross substitutionexcellent comprehensive performancenonlinear optical materialsstructural transformation

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • Rare-earth-based chalcogenides are promising for infrared nonlinear optical (IR-NLO) applications.
  • Challenges include adverse two-photon absorption and low laser-induced damage thresholds (LIDTs) due to narrow optical band gaps (Eg).
  • Existing materials often struggle to balance broad band gaps with significant nonlinear optical (NLO) properties.

Purpose of the Study:

  • To synthesize new noncentrosymmetric (NCS) europium (Eu)-based chalcogenides from a centrosymmetric (CS) parent compound.
  • To investigate their structural, linear optical, and IR-NLO properties.
  • To address limitations of narrow band gaps and low LIDTs in IR-NLO materials.

Main Methods:

  • Synthesis of EuZnSiS₄ and EuCdSiS₄ via a cross-substitution strategy from EuGa₂S₄.
  • Single-crystal X-ray diffraction for structural analysis.
  • Characterization of optical band gaps, transparency windows, second-harmonic generation (SHG) intensities, and laser-induced damage thresholds (LIDTs).

Main Results:

  • Two new NCS compounds, EuZnSiS₄ and EuCdSiS₄, were successfully synthesized, crystallizing in distinct orthorhombic space groups.
  • Both compounds exhibit robust phase-matching SHG intensities (1.5-2.8 × AgGaS₂) and high LIDTs (14-17 × AgGaS₂).
  • EuCdSiS₄ demonstrates a wide Eg (>2.56 eV) and significant SHG effect, a pioneering achievement for Eu-based IR-NLO materials.

Conclusions:

  • The developed Eu-based chalcogenides offer a promising chemical route for advanced IR-NLO functional materials.
  • The combination of asymmetric functional units is key to achieving NCS structures and enhanced NLO properties.
  • These materials present exciting opportunities for future IR-NLO applications.