AI Article Synopsis
- * A metal-free birefringent crystal, NH(HCNO)·2HO, was synthesized using a simple solution method, showcasing an impressive birefringence of 0.54 at 550 nm, surpassing many metal-containing crystals.
- * The stability of birefringence across a temperature range of 243 K to 313 K highlights the crystal's robustness, offering new insights into using non-covalent interactions for developing efficient optical materials.
Article Abstract
Birefringent crystals can manipulate the phase and polarization of light, so they are widely used as essential components in various optical devices. Common strategies to construct birefringent crystals are introducing metal cations that are either able to realize favorable coordination with functional anionic units or are susceptible to polarizability anisotropy. Herein, we report a metal-free crystal, NH(HCNO)·2HO, synthesized using the facile solution method. In the crystal structure of NH(HCNO)·2HO, (HCNO) functional units are assembled in an optimal manner by cooperative non-covalent interactions, , hydrogen bonding and π-π interactions. As a result, this metal-free crystal possesses exceptional birefringence up to 0.54@550 nm, which is larger than those of most metal-containing birefringent crystals. In addition, the interference color of this crystal does not change obviously from 243 K to 313 K, indicating that the birefringence is robust at different temperatures. This work will inspire useful insights into the role of non-covalent interactions in designing outstanding birefringent crystals for efficient polarized optical devices.
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