Rhenium diselenide - Misplaced Pages

Rhenium diselenide
Names
d: SEM micrograph of a typical parallelogram-shaped ReSe₂ flake, scale bar 1 µm. g: top view of the ReSe₂ atomic lattice
Unit cell of rhenium diselenide.
IUPAC name Bis(selanylidene)rhenium
Other names Rhenium(IV) selenide
Identifiers
CAS Number	12038-64-1
3D model (JSmol)	Interactive image
ChemSpider	74776
ECHA InfoCard	100.031.696
EC Number	234-879-9
PubChem CID	82865
CompTox Dashboard (EPA)	DTXSID2065202
InChI InChI=1S/2Se.ReKey: CUYHGAIVHCHFIA-UHFFFAOYSA-N
SMILES ==
Properties
Chemical formula	ReSe₂
Molar mass	344.13 g/mol
Odor	odorless
Density	9.22 g/cm
Solubility in water	insoluble
Band gap	~1.2 eV (300 K), indirect
Structure
Crystal structure	Triclinic, aP12, space group P1, No 2
Lattice constant	a = 0.6602 nm, b = 0.6716 nm, c = 0.6728 nmα = 91.82°, β = 104.9°, γ = 118.94°
Formula units (Z)	4
Related compounds
Other anions	Rhenium(IV) oxide Rhenium disulfide Rhenium ditelluride
Other cations	Manganese diselenide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Chemical compound

Rhenium diselenide is an inorganic compound with the formula ReSe₂. It has a layered structure where atoms are strongly bonded within each layer. The layers are held together by weak Van der Waals bonds, and can be easily peeled off from the bulk material.

Synthesis

Schematic of the ReSe₂ growth from Se and ReO₃

Rhenium diselenide with a thickness as small as a triple-atomic layer can be produced by chemical vapor deposition at ambient pressure. A mixture of Ar and hydrogen gases is flown through a tube whose ends are kept at different temperatures. The substrate and ReO₃ powder are placed at the hot end which is heated to 750 °C, and selenium powder is located at the cold end which is kept at 250 °C.

2 ReO₃ + 7 Se → 2 ReSe₂ + 3 SeO₂

Properties

Top view (left) and side view (right) of the ReSe₂ lattice

As most other dichalcogenides of transition metals, rhenium diselenide has a layered structure where atoms are strongly bonded within each layer and the layers are held together by weak Van der Waals bonds. However, while most other layered dichalcogenides have a high (hexagonal) symmetry, ReSe₂ has a very low triclinic symmetry, and this symmetry does not change from the bulk to monolayers.

References

Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 4.84. ISBN 1-4398-5511-0.
^ Wildervanck, J.C; Jellinek, F (1971). "The dichalcogenides of technetium and rhenium". Journal of the Less Common Metals. 24: 73–81. doi:10.1016/0022-5088(71)90168-8.
Dumcenco, D; Huang, Y. S; Liang, C. H; Tiong, K. K (2008). "Optical characterization of Au-doped rhenium diselenide single crystals". Journal of Applied Physics. 104 (6): 063501–063501–6. Bibcode:2008JAP...104f3501D. doi:10.1063/1.2977682.
^ Jiang, Shaolong; Hong, Min; Wei, Wei; Zhao, Liyun; Zhang, Na; Zhang, Zhepeng; Yang, Pengfei; Gao, Nan; Zhou, Xiebo; Xie, Chunyu; Shi, Jianping; Huan, Yahuan; Tong, Lianming; Zhao, Jijun; Zhang, Qing; Fu, Qiang; Zhang, Yanfeng (2018). "Direct synthesis and in situ characterization of monolayer parallelogrammic rhenium diselenide on gold foil". Communications Chemistry. 1. doi:10.1038/s42004-018-0010-6.