(NH<sub>4</sub>)<sub>3</sub>[B(OH)<sub>3</sub>]<sub>2</sub>(COOH)<sub>3</sub>: a graphite-like UV nonlinear optical material with a large birefringence<i>via</i>structural optimization
Yalan Deng, Lei Wang, Yuwei Ge, Ling Huang, Daojiang Gao, Jian Bi, Guohong Zou
Abstract
A novel noncentrosymmetric (NCS) metal-free formic-borate, (NH4)3[B(OH)3]2(COOH)3, has been discovered, which exhibits an infrequent graphite-like structure. The alliance of two types of π-conjugated planar anions BO33- and COOH- produced an optimized layered structure to maximize the anisotropic polarizability, resulting in an extremely large birefringence (0.156@546 nm), larger than that of the classical commercial UV birefringent material α-BBO (0.122@546 nm). This strategy that structural optimization could enhance birefringence will guide the discovery of large birefringence materials, especially in the UV region.
Topics & Concepts
BirefringenceGraphiteNonlinear opticalMaterials scienceNonlinear systemOptoelectronicsCrystallographyPhysicsOpticsChemistryComposite materialQuantum mechanicsCrystal Structures and PropertiesOrganometallic Compounds Synthesis and CharacterizationCrystal structures of chemical compounds