Strategically designed metal-free deep-ultraviolet birefringent crystals with superior optical properties.

Finding new birefringent materials with deep-ultraviolet (DUV, < 200 nm) transparency is urgent, as current commercial materials cannot meet the rapidly growing demands in related application fields. Herein, three guanidinium-based compounds, C(NH)CHSO, β-C(NH)Cl, and γ-C(NH)Cl, all featuring [C(NH)·X] (X = CHSO and Cl) pseudo layers, were designed through structural motif tailoring. Theoretical calculations indicate that these metal-free compounds all possess broad bandgaps (6.

Crystal clear: unveiling giant birefringence in organic-inorganic cocrystals.

Coplanar groups with large anisotropic polarizability are suitable as birefringence-active groups for investigating compounds with significant birefringence. In this study, the organic coplanar raw reagent, -CHNO (4HP), was selected as an individual complement. Utilizing the cocrystal engineering strategy, we successfully designed two cocrystals: [LiNO·HO·4HP]·4HP (Li-4HP2) and [Mg(NO)·6HO]·(4HP) (Mg-4HP), and one by-product: LiNO·HO·4HP (Li-4HP), which were grown using a mild aqua-solution method.

Correction: Hydrogen bonding bolstered head-to-tail ligation of functional chromophores in a 0D SbF·glycine adduct for a short-wave ultraviolet nonlinear optical material.

[This corrects the article DOI: 10.1039/D4SC01353K.].

Hydrogen bonding bolstered head-to-tail ligation of functional chromophores in a 0D SbF·glycine adduct for a short-wave ultraviolet nonlinear optical material.

The key properties of nonlinear optical (NLO) materials highly rely on the quality of functional chromophores (FCs) and their optimized interarrangement in the lattice. Despite the screening of various FCs, significant challenges persist in optimizing their arrangement within specific structures. Generally, FC alignment is achieved by designing negatively charged 2D layers or 3D frameworks, further regulated by templating cations.

Novel ultraviolet (UV) nonlinear optical (NLO) materials discovered by chemical substitution-oriented design.

Exploring novel functional materials chemical substitution-oriented design is an emerging strategy. The method can be expanded to the discovery of high performance ultraviolet (UV) nonlinear optical (NLO) solid state materials by a careful tuning of the substituted atoms. This minireview presents a brief introduction to chemical substitution-oriented design including single-site substitution, dual-site substitution, and multisite substitution.