Praseodymium(III) acetate

Praseodymium acetate
Names
	IUPAC names Tetra-μ2-acetatodiaquadipraseodymium(III) praseodymium (3+) triacetate
	Other names Praseodymium ethanoate
Identifiers
CAS Number	6192-12-7;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:63078;
ChemSpider	145010;
ECHA InfoCard	100.025.676
EC Number	228-242-4;
PubChem CID	165418;
CompTox Dashboard (EPA)	DTXSID50890615 ;
	InChI InChI=1S/3C2H4O2.Pr/c31-2(3)4;/h31H3,(H,3,4);/q;;;+3/p-3 Key: KPXRPRLCONABEG-UHFFFAOYSA-K;
	SMILES [Pr+3].O=C([O-])C.[O-]C(=O)C.[O-]C(=O)C;
Properties
Chemical formula	Pr(O2C2H3)3
Appearance	Green solid
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Praseodymium(III) acetate is an inorganic salt composed of a Praseodymium atom trication and three acetate groups as anions. This compound commonly forms the dihydrate, Pr(O₂C₂H₃)₃·2H₂O.^[2]

Preparation

Praseodymium(III) acetate can be formed by the reaction of acetic acid and praseodymium(III) oxide:^[3]

{\mathsf {6CH_{3}COOH+Pr_{2}O_{3}\ \xrightarrow {T} \ 2Pr(CH_{3}COO)_{3}+3H_{2}O}}

Praseodymium(III) carbonate and praseodymium(III) hydroxide can also be used:

{\mathsf {6CH_{3}COOH+Pr_{2}(CO_{3})_{3}\ \xrightarrow {T} \ 2Pr(CH_{3}COO)_{3}+3H_{2}O+3CO_{2}}}

↑

{\mathsf {6CH_{3}COOH+2Pr(OH)_{3}\ \xrightarrow {T} \ 2Pr(CH_{3}COO)_{3}+6H_{2}O}}

Structure

According to X-ray crystallography, anhydrous praseodymium acetate is a coordination polymer. Each Pr(III) center is nine-coordinate, with two bidentate acetate ligands and the remaining sites occupied by oxygens provided by bridging acetate ligands. The lanthanum and holmium compounds are isostructural.^[4]

Decomposition

When the dihydrate is heated, it decomposes to the anhydrous, which then decomposes into praseodymium(III) oxyacetate(PrO(O₂C₂H₃)) then to praseodymium(III) oxycarbonate, and at last to praseodymium(III) oxide.^[2]

References

^ "Praseodymium(3+) acetate". pubchem.ncbi.nlm.nih.gov. Retrieved 30 March 2022.
^ ^a ^b Nakata, Kazuaki; Hiroo, Katsu; Takagi, Yoshito (1996). "Crystal Structures of Intermediate Products Appearing on the Way of Thermal Decomposition of Praseodymium (III) Acetate Dihydrate by X-ray Powder Diffraction". Bulletin of Osaka Kyoiku University Division III: Natural Sciences. 44 (2). Osaka Kyoiku University: 153–162. ISSN 0373-7411.
^ Hall, L. C.; Flanigan, D. A. (Dec 1, 1963). "Polarography of Lanthanum(III), Praseodymium(III), and Ytterbium(III) in Anhydrous Ethylenediamine". Analytical Chemistry. 35 (13). American Chemical Society (ACS): 2108–2112. doi:10.1021/ac60206a036. ISSN 0003-2700.
^ Lossin, Adalbert; Meyer, Gerd (1994). "Pr(CH₃COO)₃, ein wasserfreies Selten-Erd-Acetat mit Netzwerkstruktur". Zeitschrift für Anorganische und Allgemeine Chemie. 620 (3). doi:10.1002/zaac.19946200306.

[1] "Praseodymium(3+) acetate". pubchem.ncbi.nlm.nih.gov. Retrieved 30 March 2022.

[cry-2] Nakata, Kazuaki; Hiroo, Katsu; Takagi, Yoshito (1996). "Crystal Structures of Intermediate Products Appearing on the Way of Thermal Decomposition of Praseodymium (III) Acetate Dihydrate by X-ray Powder Diffraction". Bulletin of Osaka Kyoiku University Division III: Natural Sciences. 44 (2). Osaka Kyoiku University: 153–162. ISSN 0373-7411.

[3] Hall, L. C.; Flanigan, D. A. (Dec 1, 1963). "Polarography of Lanthanum(III), Praseodymium(III), and Ytterbium(III) in Anhydrous Ethylenediamine". Analytical Chemistry. 35 (13). American Chemical Society (ACS): 2108–2112. doi:10.1021/ac60206a036. ISSN 0003-2700.

[Meyer-4] Lossin, Adalbert; Meyer, Gerd (1994). "Pr(CH₃COO)₃, ein wasserfreies Selten-Erd-Acetat mit Netzwerkstruktur". Zeitschrift für Anorganische und Allgemeine Chemie. 620 (3). doi:10.1002/zaac.19946200306.

[1]

[2]

[3]

[4]

Preparation

Structure

Decomposition

See also

References