SnCl₂[SC(NH₂)₂]: lone-pair and hydrogen-bonding triggered chromophore assembling for dual optical optimization.

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Designing wide bandgap birefringent crystals is challenging, particularly in chalcogenide systems.
• Thiourea's structural anisotropy and halogenated tin(II)-based anionic groups offer potential for optical applications.

Purpose of the Study:

• To screen and characterize a novel molecular crystal for enhanced optical properties.
• To investigate a new design strategy for chalcogenides with wide bandgaps and high birefringence.

Main Methods:

• Crystal database screening to identify potential candidates.
• Characterization of the molecular structure and optical properties of SnCl2[SC(NH2)2].
• Analysis of synergistic interactions and hydrogen bonding effects.

Main Results:

• A novel molecular crystal, SnCl2[SC(NH2)2], was identified.
• The crystal exhibits a wide bandgap of 3.362 eV, surpassing the 3 eV limit.
• A large birefringence of 0.20@546 nm was achieved.

Conclusions:

• SnCl2[SC(NH2)2] demonstrates a facile design strategy for developing chalcogenides with dual optical enhancement.
• The material's unique structure and synergistic interactions contribute to its superior optical properties.
• This work paves the way for new materials in optoelectronics and photonics.