Elucidating the structure-nonlinear optical property relationship of Te2O4(OH)2

From CdPb8(SeO3)4Br10 to Pb3(TeO3)Br4: the first tellurite bromide exhibiting an SHG response and mid-IR transparency

“…14 The coordination environment of Se 4+ and Te 4+ is inherently polar due to the presence of stereo-chemically active lone pairs (SALP) of electrons, with oxygen ligands being located on one side of the cations. 15,16 Researchers have made significant efforts to enhance the probability of obtaining NCS selenite and tellurite crystals. In this endeavor, one effective strategy employed is to combine different nonlinear active groups within a single structure.…”

A UV non-hydrogen pure selenite nonlinear optical material for achieving balanced properties through framework-optimized structural transformation

“…13–17 To be commercially available, UV NLO materials need to simultaneously meet the following conditions: (a) a large second harmonic generation (SHG) response, (b) a wide band gap, (c) a high laser-induced damage threshold (LIDT), (d) high thermal stability and excellent environmental stability, and (e) sufficient birefringence to satisfy phase matching. 18–24 Due to the contradiction between the above conditions, it is very difficult to synthesize UV NLO materials with balanced properties. Therefore, how to design UV NLO materials with balanced performance is a very urgent task.…”

C(NH2)3Cd(C2O4)Cl(H2O)·H2O and BaCd(C2O4)1.5Cl(H2O)2: Two Oxalate Chlorides Obtained by Chemical Scissors Strategy Exhibiting Low-Dimensional Structural Networks and Balanced Overall Optical Properties

“…Te(VI)O 6 layers in Te 2 O 4 (OH) 2 are cleaved by H 2 O molecules, leading to two OH − groups, producing an NLO material. 30 In addition to the terminal atoms and groups, organic ions with large steric hindrance, such as [H 3−x C 3 N 3 O 3 ] x− , [C 3 H 7 N 6 ] + , and [C(NH 2 ) 3 ] + , are conducive to the formation of low-dimensional compounds. 31−36 Planar anionic groups that could link each other such as πconjugated C−O units [C 2 O 4 ] 2− , [C 2 O 6 ] 2− , [C 4 O 4 ] 2− , and [C 6 O 6 ] 2− , tend to form chains or layered structures, which is beneficial to obtaining low-dimensional crystalline compounds.…”

“…For instance, from BPO 4 to KB­(PO 4 )­F, the insertion of F reduces the dimension of the structure, forming a {[BPO 4 F] − } ∞ layer made up of [BO 3 F] 4– and [PO 4 ] 3– , with the charge balance of a cation. , Then, the OH – and coordinated H 2 O, as terminal groups, have similar effects as halogens . Compared to the Te 2 O 5 with a 3D framework, the Te–O bonds of the Te­(VI)­O 6 layers in Te 2 O 4 (OH) 2 are cleaved by H 2 O molecules, leading to two OH – groups, producing an NLO material . In addition to the terminal atoms and groups, organic ions with large steric hindrance, such as [H 3– x C 3 N 3 O 3 ] x − , [C 3 H 7 N 6 ] + , and [C­(NH 2 ) 3 ] + , are conducive to the formation of low-dimensional compounds. − …”