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(NH4)3[B(OH)3]2(COOH)3: a graphite-like UV nonlinear optical material with a large birefringence via structural
Yalan Deng1, Lei Wang1, Yuwei Ge1
1College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, P. R. China. huangl026@sina.com.
Chemical Communications (Cambridge, England)
|July 29, 2020
Summary
A new metal-free material, (NH4)3[B(OH)3]2(COOH)3, with a unique graphite-like structure shows exceptionally high birefringence. This discovery offers a new strategy for developing advanced UV birefringent materials.
Area of Science:
- Materials Science
- Crystallography
- Optics
Background:
- Noncentrosymmetric (NCS) materials are crucial for optical applications.
- Discovering novel materials with high birefringence, especially for UV applications, remains a challenge.
Purpose of the Study:
- To discover and characterize a novel metal-free noncentrosymmetric material.
- To investigate the relationship between structural design and optical properties, specifically birefringence.
Main Methods:
- Synthesis of a novel formic-borate compound: (NH4)3[B(OH)3]2(COOH)3.
- Structural analysis revealing a graphite-like layered arrangement.
- Optical characterization to determine birefringence values.
Main Results:
- The new material exhibits an infrequent graphite-like structure.
- An exceptionally large birefringence of 0.156@546 nm was measured.
- This value surpasses that of the commercial UV birefringent material α-BBO (0.122@546 nm).
Conclusions:
- The combination of π-conjugated planar anions (BO33- and COOH-) optimizes the layered structure for enhanced anisotropic polarizability.
- Structural optimization is a viable strategy for discovering materials with large birefringence, particularly for UV applications.
- This work provides a new avenue for the development of advanced UV birefringent materials.
