(R)- and (S)-[C₈H₁₀NO₃]₂[NbOF₅]: noncentrosymmetric niobium oxyfluorides with large optical anisotropy

Abstract

Huge crystals of noncentrosymmetric (NCS) organic-inorganic hybrid niobium oxyfluorides, (R)-[C8H10NO3]2[NbOF5] [(R)-Nb] and (S)-[C8H10NO3]2[NbOF5] [(S)-Nb], have been easily grown via a slow evaporation method in high yields through the systematic driving...

The transformation of a zero-dimensional cluster into a one-dimensional chain structure achieving a dramatically enhanced birefringence in tin(ii)-based oxalates

“…(2) Distorted tetrahedral moieties, such as fluorooxoborates [BO x F 4− x ] ( x +1)− and fluorophosphates PO 3 F, which have produced BaB 8 O 12 F 2 (0.116@1064 nm) 19 and (N 2 H 6 )[HPO 3 F] 2 (0.077@1064 nm) 20 with enhanced birefringence. (3) Jahn–Teller cations include the specifically octahedrally coordinated d 0 transition metals (TMs: Mo 6+ , W 6+ , V 5+ , and Nb 5+ ) and cations with stereochemically active lone pairs (SCALP, I 5+ , Te 4+ , Se 4+ , and Sn 2+ ) such as d 0 transition metal cations Nb 5+ in K 3 Nb 3 Ge 2 O 13 (0.196@546 nm) 21 and ( R )- and ( S )-[C 8 H 10 NO 3 ] 2 [NbOF 5 ] (0.19–0.199@589.3 nm), 22 Ti 4+ in BaTi(BO 3 ) 2 (0.169@546 nm), 23 stereochemically active lone pair (SCALP) cations Sn 2+ in Sn 2 PO 4 Br (0.336@546 nm), 24 Sb 3+ in K 2 SbP 2 O 7 F (0.157@546 nm), 25 and SbB 3 O 6 (0.290@546 nm), 26 I 5+ in LiGaF 2 (IO 3 ) 2 (0.206@532 nm). 27 The current strategy focuses on the simultaneous introduction of multiple birefringence-active functional modules (FMs) mentioned above into one structure to construct optical materials with large birefringence.…”

KHC2O4·B(OH)3: A nonlinear optical crystal with large birefringence in the short‐wavelength ultraviolet region

“…Some compounds with large birefringence but small SHG response, limited by the same reason, have also been found in both inorganic and organic systems, such as nonpolar (R)-and (S)-[C 8 H 10 NO 3 ] 2 [NbOF 5 ] (P2 1 2 1 2, 0.19-0.199@589.3 nm, 0.4 Â KDP), polar Sn 2 B 5 O 9 Cl (Pnn2, 0.171@546 nm, 0.5 Â KDP), and polar K 2 Sb 2 (C 2 O 4 )F 6 (Pca2 1 , 0.097@546 nm, 0.1 Â KDP). 48,67,68 Attributable to the unfavorable arrangements, the x-and y-components of BO 3 are completely canceled, while the z-component is 5.67 D and brings out the mild SHG response, which is similar to the reported polar compounds with large dipole moments but small SHG response such as KPb 2 (PO 3 ) 5 (Pc, 34.42 D, 0.5 Â KDP) and RbPb 2 (PO 3 ) 5 (Pc, 8.07 D, 0.3 Â KDP). 69…”