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Chiral-Unit-Driven Short-Wave Ultraviolet Nonlinear Optical Acetates with Balanced Overall Optical Properties
Zi-Xuan Zhao1, Wei Chen1, Hui-Yan Zhao2
1College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, P. R. China.
The Journal of Physical Chemistry Letters
|December 26, 2025
Summary
Researchers developed new chiral acetates for short-wave ultraviolet nonlinear optical (NLO) applications. These materials offer a balance of large second-harmonic generation (SHG) and moderate birefringence, crucial for advanced optical devices.
Area of Science:
- Materials Science
- Crystallography
- Optics
Background:
- Developing short-wave ultraviolet (UV) nonlinear optical (NLO) crystals requires balancing large second-harmonic generation (SHG) coefficients, moderate birefringence, and wide band gaps.
- Existing NLO materials often struggle to achieve this optimal combination of properties.
Purpose of the Study:
- To synthesize and characterize novel polar acetates with potential as short-wave UV NLO crystals.
- To investigate the structure-property relationships governing their NLO performance.
Main Methods:
- Synthesis of chiral acetates R-/S-(C5H14N2)(CH3COO)2.
- Measurement of second-harmonic generation (SHG) coefficients and birefringence.
- UV cutoff edge determination.
- Hirshfeld surface analysis.
- Theoretical calculations.
Main Results:
- The synthesized acetates exhibit balanced NLO properties: SHG responses of 1.5/1.4 × KH2PO4 (KDP), moderate birefringence (0.0871/0.0838@546 nm), and UV cutoff below 200 nm.
- These acetates show significantly enhanced SHG (3.0/2.3 times) and birefringence (7.9/7.0 times) compared to related phosphates.
- Hirshfeld analysis highlighted the role of hydrogen bonding in directing homochiral structures.
Conclusions:
- The novel chiral acetates are promising candidates for short-wave UV NLO applications.
- Combining chiral groups with NLO-active oxyanions is an effective strategy for designing new UV NLO crystals.
- Understanding hydrogen bonding interactions is key to controlling crystal structure and NLO properties.
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