[C₃N₆H₇]₂[B₃O₃F₄(OH)]: a new hybrid birefringent crystal with strong optical anisotropy induced by mixed functional units

Abstract

A new hybrid fluorooxoborate was discovered following the strategy of combining two birefringence-active units. The large birefringence and short absorption edge make it a potential short-wavelength ultraviolet birefringent crystal.

Performance of optical materials with the derivative of planar π-conjugated groups: Recent advances and future prospects

“…[C 3 N 6 H 7 ] 2 [B 3 O 3 F 4 (OH)] crystallizes in the space group P 1̄ in the triclinic system and it was obtained by the mild molten salt method. 72 As shown in Fig. 9, [B 3 O 3 F 4 (OH)] is composed of [BO 2 F 2 ] and [BO 2 (OH)] units and [C 3 N 6 H 7 ] rings appear in pairs through the O–H⋯O and N–H⋯N interactions, respectively.…”

Difluoro(oxalato)borates as Short-Wavelength Optical Crystals with Bifunctional [BF2C2O4] Units

“…In boron-based compounds, aggregations of B atoms linked by bridged O/N atoms and shielded by varied nucleophiles, such as N, O, F, and [OH], etc., at the molecular level lead to the formation of different subclasses, such as borates, − hydroxyborates, − fluorooxoborates, − oxonitridoborates, , and so on. Emergent compounds with multiple anions that are constructed by the incorporation of additional anionic units with B–O skeletons largely expand the boron-based chemistry and enrich the types of building blocks for property-oriented de novo design.…”

Ag[SC(NH2)2]2F: A Laser Damage-Tolerant Infrared Nonlinear Optical Material

“…Nonlinear optical (NLO) crystals are extremely vital for broadening the wavelength of solid-state laser sources. − Among them, great progress has been made in deep ultraviolet (UV)–visible NLO crystals. − For the IR region, AgGaSe 2 (AGSe), AgGaS 2 (AGS), and ZnGeP 2 (ZGP), as the known commercialized NLO crystals, their shortcomings such as low laser-induced damage threshold (LIDT), non-phase-matching, or two-photon absorptions cannot be ignored. , Thus, research on new IR NLO crystal materials is still hot. In recent studies, many chalcogenides with good second harmonic generation (SHG) properties have been reported: Li 4 MgGe 2 S 7 , [ABa 2 Cl]­[Ga 4 S 8 ] (A = Rb, Cs), LiAsS 2– x Se x , Li 0.60 Ag 0.40 GaS 2 , AgHgPS 4 , BaHgSe 2 , A 2 SnS 5 (A = Ba, Sr), Li 2 BaSnS 4 , Na 1– x K x AsQ 2 (Q = S, Se), and Ln 4 GaSbS 9 (Ln = Pr, Nd, Sm, Gd–Ho) .…”