Related Experiment Video
Updated: Jun 1, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
The two-dimensional thio-phosphate CsCrP(2)S(7)
Kyounghee Kim1, Jooran Na, Hoseop Yun
1Division of Energy Systems Research and Department of Chemistry, Ajou University, Suwon 443-749, Republic of Korea.
Abstract:
The quaternary title compound, caesium chromium(III) hepta-thio-diphosphate(V), CsCrP(2)S(7), has been synthesized using the reactive halide flux method. It is isotypic with other AMP(2)S(7) (A = alkali metal; M = Cr, V or In) structures and consists of two-dimensional (∞) (2)[CrP(2)S(7)](-) layers extending parallel to (001) which are separated from each other by Cs(+) ions (symmetry 2). The layer is built up from slightly distorted octa-hedral [CrS(6)] units (symmetry 2) and bent [P(2)S(7)] units consisting of two corner-sharing [PS(4)] tetra-hedra. The [CrS(6)] octa-hedra share two edges and two corners with the [PS(4)] tetra-hedra. There are only van der Waals inter-actions present between the layers. The Cs(+) ions are located in this van der Waals gap and stabilize the structure through weak ionic inter-actions. The classical charge balance of the title compound can be expressed as [Cs(+)][Cr(3+)][P(5+)](2)[S(2-)](7.).
Related Concept Videos
Preparation and Reactions of Sulfides
Predicting Molecular Geometry
Hybridization of Atomic Orbitals II
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Structure and Nomenclature of Thiols and Sulfides
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

