Exploring short-wavelength birefringent crystals via triggering cooperative arrangement between different π-conjugated groups

Abstract

We herein reported our strategy to assemble planar π-conjugated [B(OH)₃] and [C₂O₄]²⁻/[HC₂O₄]⁻/[C₄O₄]²⁻ functional groups to explore short-wavelength birefringent crystals. Three compounds, K₂C₂O₄·B(OH)₃, Cs₄(HC₂O₄)₂(C₂O₄)·[B(OH)₃]₂ and K(C₄O₄)_0.5·B(OH)₃, which all exhibit a layered structure favorable for generating large optical anisotropy, were synthesized and characterized. The strategy of assembling π-conjugated [B(OH)₃] and C–O functional modules shows the potential to explore promising UV birefringent materials.