Chromium(II) selenide

Chromium(II) selenide  Names

IUPAC name

Chromium(2+) selenide

Identifiers

CAS Number

* 12053-13-3

3D model (JSmol)

* Interactive image

EC Number |

* 234-999-1

PubChem CID

* 82886

InChI

* InChI=1S/Cr.Se

Key: UVZCKRKEVWSRGT-UHFFFAOYSA-N

SMILES

* [Cr]=[Se]

Properties

Chemical formula

| CrSe
Molar mass | 130.96 g/mol
Appearance  | white to pale yellow crystalline powder
Density | 6.74 g/cm3
Melting point | ~1500 °C

Solubility in water

| insoluble
Structure[1]

Crystal structure

| NiAs type (hexagonal)

Space group

| P63/mmc, No. 194

Lattice constant

a = 371 pm, c = 603 pm

Hazards
NFPA 704 (fire diamond)  |

NIOSH (US health exposure limits):

PEL (Permissible)

| TWA 1 mg/m3[2]

REL (Recommended)

| TWA 0.5 mg/m3[2]

IDLH (Immediate danger)

| 250 mg/m3[2]

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Chromium(II) selenide is an inorganic compound with the chemical formula CrSe. It crystalizes in a hexagonal structure with space group P63/mmc.[3] It is one of many related Chromium-Selenium phases, including Cr7Se8, Cr3Se4, Cr0.68Se, Cr2Se3, and Cr5Se8.[3] The compound has been described as an antiferromagnet, but its inverse magnetic susceptibility does not match the behavior expected for an antiferromagnet according to the Curie–Weiss law.[1] One suggestion was that the Néel temperature is at 320 K, as the temperature where the compound has maximum specific heat.[4] When synthesized as single atomic layer, CrSe is ferromagnetic, with a Curie Temperature of around 280 K.[5]

## References

1. ↑ 1.0 1.1 Lotgering, F.K.; Gorter, E.W. (1957). "Solid solutions between ferromagnetic and antiferromagnetic compounds with NiAs structure". Journal of Physics and Chemistry of Solids (Elsevier BV) 3 (3-4): 238–249. doi:10.1016/0022-3697(57)90028-8. ISSN 0022-3697.
2. ↑ 2.0 2.1 2.2 NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0141.html.
3. ↑ 3.0 3.1 Wehmeier, F. H.; Keve, E. T.; Abrahams, S. C. (1970). "Preparation, structure, and properties of some chromium selenides. Crystal growth with selenium vapor as a novel transport agent". Inorganic Chemistry (American Chemical Society (ACS)) 9 (9): 2125–2131. doi:10.1021/ic50091a032. ISSN 0020-1669.
4. ↑ Tsubokawa, Ichiro (1960). "The Magnetic Properties of Single Crystals of Chromium Selenide". Journal of the Physical Society of Japan (Physical Society of Japan) 15 (12): 2243–2247. doi:10.1143/jpsj.15.2243. ISSN 0031-9015.
5. ↑ Zhang, Yu; Chu, Junwei; Yin, Lei et al. (2019-03-28). "Ultrathin Magnetic 2D Single‐Crystal CrSe". Advanced Materials (Wiley) 31 (19): 1900056. doi:10.1002/adma.201900056. ISSN 0935-9648.

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Chromium compounds

Chromium(0)|

* Cr(CO)6

| Organochromium(0) compounds|

* Cr(C6H6)2
* CrC6H6(CO)3

|

Chromium(II)|

* Cr(C2H3O2)2
* CrBr2
* Cr3C2
* Cr(C2O4)
* CrCl2
* CrF2
* CrO
* CrSe
* CrSi2
* CrSO4

| Organochromium(II) compounds|

* Cr(C5H5)2

|

Chromium(II, III)|

* Cr3C2

Chromium(III)|

* Cr(C2H3O2)3
* CrB
* CrBr3
* CrCl3
* CrF3
* CrI3
* CrN
* Cr(NO3)3
* Cr(OH)3
* Cr2O3
* Cr2S3
* Cr2(SO4)3
* Cr2Te3

Chromium(IV)|

* CrCl4
* CrF4
* CrO2

Chromium(V)|

* CrF5
* K3Cr(O2)4

Chromium(VI)|

* CrO3
* CrS3
* CrO(O2)2
* H2CrO4/H2Cr2O7
* CrO2F2
* CrO2Cl2
* C5H5NHCrO3Cl
* CrF6 (hypothetical)

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Selenides

| H2Se
H2Se2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | He

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Li2Se | Be |  |  |  |  |  |  |  |  |  |  | B | CSe2
OCSe | (NH4)2Se | O | F | Ne
Na2Se | MgSe |  |  |  |  |  |  |  |  |  |  | Al2Se3 | Si | PxSey | S | Cl | Ar
K2Se | CaSe | Sc2Se3 | TiSe2 | V | CrSe
Cr2Se3 | MnSe
MnSe2 | FeSe | CoSe | NiSe | CuSe | ZnSe | GaSe
Ga2Se3 | GeSe | As2Se3
As4Se3 | Se | Br | Kr
Rb2Se | SrSe | Y2Se3 | Zr | NbSe2
NbSe3 | MoSe2 | Tc | Ru | Rh | Pd | Ag2Se | CdSe | In2Se3 | SnSe
SnSe2 | Sb2Se3 | Te | I | Xe
Cs2Se | BaSe | *  | Hf | Ta | WSe2
WSe3 | ReSe2 | Os | Ir | Pt | Au | HgSe | Tl2Se | PbSe | Bi2Se3 | Po | At | Rn
Fr | Ra | **  | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | CnSe | Nh | Fl | Mc | Lv | Ts | Og |  |  |  |  |  |  |  |
|  | ↓ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| * | La2Se3 | Ce2Se3 | Pr2Se3 | Nd2Se3 | Pm | Sm2Se3 | Eu2Se3 | Gd | Tb | Dy | Ho | Er2Se3 | Tm2Se3 | Yb | Lu |
| ** | Ac | ThSe2 | Pa | USe2 | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |

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