Issue 11, 2022

(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 of chiral structure-directing agents, 4-hydroxy-D-(−)-2-phenylglycine [(R)-HPG] and 4-hydroxy-L-(+)-2-phenylglycine [(S)-HPG], respectively. Both (R)-Nb and (S)-Nb crystallizing in the NCS nonpolar space group, P21212, exhibit pseudo-three-dimensional structures assembled via multiple hydrogen bonding interactions between distorted [Nb(O/F)2F4]2− octahedra and the respective protonated HPG cations. Interestingly, crystals of (R)-Nb and (S)-Nb exhibit large birefringence (Δnexp) of 0.19–0.199@589.3 nm attributable to the strong π–π interactions arising from the stacked benzene rings in HPG cations. The reported materials exhibit strong stability in most solvents in a wide range of polarities. Detailed characterization studies, including thermal properties, various spectroscopic analyses, second-harmonic generation measurements, and electronic structure calculations on the reported materials, are also described.

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

Supplementary files

Article information

Article type
Research Article
Submitted
15 feb 2022
Accepted
08 apr 2022
First published
08 apr 2022

Inorg. Chem. Front., 2022,9, 2498-2507

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

J. Moon and K. M. Ok, Inorg. Chem. Front., 2022, 9, 2498 DOI: 10.1039/D2QI00346E

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