Facile Hydrazine‐Hydrothermal Syntheses and Characterizations of Two Quaternary Thioarsenates(III): Two‐Dimensional SrAg₄As₂S₆⋅2 H₂O and One‐Dimensional BaAgAsS₃

Abstract

Two new quaternary thioarsenates(III), SrAg4 As2 S6 ⋅2 H2 O (1) and BaAgAsS3 (2), have been prepared through a hydrazine-hydrothermal method at low temperature. Compound 1 possesses a two-dimensional (2D) layer network, while compound 2 features a one-dimensional (1D) column structure. The detailed structure analysis indicates that Sr(2+) and Ba(2+) cations have different directing effects on the structures of thioarsenates(III). Both experimental and theoretical studies demonstrate that compounds 1 and 2 are narrow-gap semiconductors. Our success in synthesizing these two quaternary thioarsenates(III) proves that the hydrazine-hydrothermal technique is a powerful yet facile synthetic method for exploring new complex chalcogenides with diverse crystal structures and interesting physical properties.

SrAgAsS4: A Noncentrosymmetric Sulfide with Good Infrared Nonlinear Optical Performance Induced by Aliovalent Substitution from Centrosymmetric SrGa2S4

“…Without considering Ag1B, SrAgAsS 4 can be regarded as isomorphic to SrCdGeS 4 . Within the quaternary chalcogenide systems AE–M–M′–Q (AE = alkaline-earth metal; M = Cu, Ag; M′ = P, As; Q = chalcogens), only three CS compounds have been reported before, including MgAg 2 P 2 S 6 , BaAgAsS 3 , and SrAg 4 As 2 S 6 ·2H 2 O . In these compounds, however, the P atoms have an oxidation state of +4, showing a unique ethane-like (P 2 S 6 ) 4– unit, and the As atoms adopt a coordination geometry of trigonal pyramid with an oxidation state of +3.…”

Quaternary Layered Semiconductor Ba2Cr4GeSe10: Synthesis, Crystal Structure, and Thermoelectric Properties

“…The isolated GeSe 4 tetrahedra with Ge–Se bonds of 2.332(2)–2.356(2) Å and S–Ge–S angles of 100.38(3)–117.36(3)°, which is a common geometry in germanium selenides. Both Ba1 and Ba2 exhibit a normal tricapped trigonal-prismatic coordination sphere with nine Ba–Se bonds between 3.250(2) and 3.716(2) Å (as detailed in Figure c and Table S3); such a similar coordination geometry is also observed in some other Ba-based chalcogenides. − …”

Interesting dimensional transition through changing cations as the trigger in multinary thioarsenates displaying variable photocurrent response and optical anisotropy

“…Recently, a surfactant-thermal reaction has been proved to be a facile method for exploring novel chalcogenides. [23][24][25][26][27][28][29][30][31] In this study, our continuous explorations based on the surfactant-thermal method have led to the discovery of two new thioarsenates, Cs 2 ZnAs 4 S 8 and [(NH 4 )Cs]CdAs 4 S 8 . Although these two compounds have identical stoichiometry 2-1-4-8, they are not isostructural and undergo an interesting dimensional transition from a 3D framework to a 2D layered structure.…”