Cadmium acetate

Cadmium acetate

Names
IUPAC name Cadmium acetate
Other names Cadmium diacetate
Identifiers
CAS Number	543-90-8  Y 5743-04-4 (dihydrate) Y
3D model (JSmol)	ionic form: Interactive image coordination form: Interactive image
ChemSpider	10521  Y
ECHA InfoCard	100.008.049
EC Number	208-853-2
PubChem CID	10986
RTECS number	AF7505000
UNII	95KC50Z1L0  Y SA10IX931V  (dihydrate) Y
UN number	2570
CompTox Dashboard (EPA)	DTXSID1020225
InChI InChI=1S/2C2H4O2.Cd/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Y Key: LHQLJMJLROMYRN-UHFFFAOYSA-L Y InChI=1/2C2H4O2.Cd/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Key: LHQLJMJLROMYRN-NUQVWONBAK
SMILES ionic form:[Cd+2].[O-]C(=O)C.[O-]C(=O)C coordination form:O=C(C)O[Cd]OC(C)=O
Properties
Chemical formula	Cd(CH3COO)2 (anhydrous) Cd(CH3COO)2·2H2O (dihydrate)
Molar mass	230.500 g/mol (anhydrous) 266.529 g/mol (dihydrate)
Appearance	colorless crystals (anhydrous) white crystals (dihydrate)
Odor	acetic acid
Density	2.341 g/cm3 (anhydrous) 2.01 g/cm3 (dihydrate)
Melting point	255 °C (491 °F; 528 K) (anhydrous) 130 °C (266 °F; 403 K) (dihydrate decomposes) [1]
Solubility in water	soluble (anhydrous), very soluble (dihydrate)
Solubility	soluble in methanol, ethanol (anhydrous) soluble in ethanol (dihydrate)
Magnetic susceptibility (χ)	−83.7·10−6 cm3/mol
Structure
Crystal structure	monoclinic
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H332, H410
Precautionary statements	P261, P264, P270, P271, P273, P280, P301+P312, P302+P352, P304+P312, P304+P340, P312, P322, P330, P363, P391, P501
NFPA 704 (fire diamond)	3 1 0
NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1027] TWA 0.005 mg/m3 (as Cd) [2]
REL (Recommended)	Ca [2]
IDLH (Immediate danger)	Ca [9 mg/m3 (as Cd)] [2]
Related compounds
Other anions	Cadmium fluoride Cadmium chloride Cadmium bromide Cadmium iodide
Other cations	Zinc acetate Mercury(II) acetate Silver acetate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N  verify  (what is  YN ?) Infobox references

Cadmium acetate is the chemical compound with the formula Cd(O₂CCH₃)₂(H₂O)₂. The compound is marketed both as the anhydrous form and as a dihydrate, both of which are white or colorless. Only the dihydrate has been verified by X-ray crystallography.

Preparation, reactions, and uses

It forms by treating cadmium oxide with acetic acid: ^{[3] [4]}

CdO + 2 CH₃CO₂H + H₂O → Cd(O₂CCH₃)₂(H₂O)₂

It can also be prepared by treating cadmium nitrate with acetic anhydride. ^[5]

Cadmium acetate has few applications. By reaction with trioctylphosphine selenide, it has often been used as a precursor to cadmium selenide and related semiconductors. ^[6]

Structure of the dihydrate

Fragment of the structure of cadmium diacetate dihydrate. Legend: red = O, black = C, blue = Cd.

Unlike the coordination geometry of zinc in zinc diacetate dihydrate, cadmium is seven coordinate in Cd(O₂CCH₃)₂(H₂O)₂. ^[7] It is a coordination polymer, featuring acetate ligands interconnecting cadmium centers.

Safety

Cadmium compounds are considered Group 1 carcinogens by the IARC.

References

1. Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. p. 447. ISBN   0-8493-0594-2.
2. NIOSH Pocket Guide to Chemical Hazards. "#0087". National Institute for Occupational Safety and Health (NIOSH).
3. Gangolli, S. (1999). The Dictionary of Substances and Their Effects. London: Royal Society of Chemistry. pp. 12–13. ISBN   9780854048137 . Retrieved 2009-03-29.
4. Patnaik, Pradyot (2003). Handbook of Inorganic Chemical Compounds. McGraw-Hill Professional. pp. 143–144. ISBN   0-07-049439-8 . Retrieved 2009-03-29.
5. F. Wagenknecht; R. Juza (1963). "Cadmium acetate". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY, NY: Academic Press. p. 1105.
6. García-Rodríguez, Raúl; Hendricks, Mark P.; Cossairt, Brandi M.; Liu, Haitao; Owen, Jonathan S. (2013). "Conversion Reactions of Cadmium Chalcogenide Nanocrystal Precursors". Chemistry of Materials. 25 (8): 1233–1249. doi:10.1021/cm3035642.
7. Harrison, W.; Trotter, J. (1972). "Crystal and molecular structure of cadmium diacetate dihydrate". Journal of the Chemical Society, Dalton Transactions (8–9): 956. doi:10.1039/dt9720000956.