[((R)-C₈H₁₂N)₄][Bi₂Br₁₀] and [((S)-C₈H₁₂N)₄][Bi₂Br₁₀]: Chiral Hybrid Bismuth Bromides Templated by Chiral Organic Cations.

ABSTRACT: Single crystals of organically templated chiral bromobismuthates(III), [((R/S)-C₈H₁₂N)₄][Bi₂Br₁₀], have been grown for the first time via a slow evaporation method. Each of the chiral molecular compound consists of (R) or (S)-1-phenylethylammonium ([C₈H₁₂N]⁺) cations and [Bi₂Br₁₀]^4- anions. Both the title compounds reveal thermal and moisture stabilities up to ca. 220 °C and over 1 month, respectively. The newly prepared Bi³⁺-based organic-inorganic hybrid materials show optical band gap of ca. 2.88 eV. The noncentrosymmetric [((R)-C₈H₁₂N)₄][Bi₂Br₁₀] and [((S)-C₈H₁₂N)₄][Bi₂Br₁₀] exhibit second harmonic generation efficiency of ca. 20 times that of ?-SiO₂ and are type I nonphase matchable. Uniformly deposited thin films of [((R)-C₈H₁₂N)₄][Bi₂Br₁₀] and [((S)-C₈H₁₂N)₄][Bi₂Br₁₀] have been also successfully obtained by a simple spin-coating method. The circular dichroism spectra for both reported thin films are symmetrical, attributable to the corresponding Cotton effect. The selectively deposited chiral thin films are expected to be used as a useful platform for various surface reactions and interface engineering.

SUBMITTER: Moon TH 

PROVIDER: S-EPMC6643783 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature