Chromium (III) acetylacetonate

Structural formula
General
Surname	Chromium (III) acetylacetonate
other names	Chromium (III) 2,4-pentanedionate; Cr (acac) 3 ; Tris (acetylacetonato) chrome (III); Tris (pentane-2,4-dionato) chrome (III);
Molecular formula	Cr (C 5 H 7 O 2 ) 3
Brief description	purple colored odorless solid
External identifiers / databases
EC number	244-526-0
ECHA InfoCard	100.040.463
PubChem	2724095
ChemSpider	2006 256
Wikidata	Q4119781
properties
Molar mass	349.32 g mol −1
Physical state	firmly
density	1.35 g cm −3
Melting point	210 ° C
boiling point	340 ° C
solubility	soluble in toluene, acetic acid and non-polar organic solvents; practically insoluble in water;
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319
	P: 280-302 + 352-332 + 313-337 + 313
Toxicological data	3360 mg kg −1 ( LD 50 , rat , oral ) ; 6350 mg kg −1 ( LD 50 , rabbit / mouse , transdermal ) ;
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (III) acetylacetonate is a chemical compound of chromium from the group of acetylacetonates .

Extraction and presentation

Chromium (III) acetylacetonate can be obtained by reacting solutions of chromium (III) salts such as chromium (III) chloride with acetic acid.

properties

Chromium (III) acetylacetonate

Chromium (III) acetylacetonate is a purple-colored, odorless solid that is practically insoluble in water. It has a monoclinic crystal structure with the space group P 2 ₁ / c (space group no. 14) . The compound begins to sublime to a green vapor at 100 ° C. Template: room group / 14

use

Chromium (III) acetylacetonate is used to modify the surface properties of solid polyurethanes formed in their presence. It also serves as a catalyst for the oxidation of methacrylic acid esters by hydrogen peroxide and is used to phlegmatize nitromethane . Due to its solubility in non-polar organic solvents and its paramagnetism, it is also used as a relaxation agent in NMR spectroscopy .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h data sheet Chromium (III) 2,4-pentanedionate, 97% from AlfaAesar, accessed on May 1, 2019 ( PDF )(JavaScript required) .
↑ ^a ^b ^c ^d ^e ^f data sheet Chromium (III) acetylacetonate, 99.99% trace metals basis from Sigma-Aldrich , accessed on April 30, 2019 ( PDF ).
↑ ^a ^b Therald Moeller: Inorganic Syntheses, Volume 5 . John Wiley & Sons, 2009, ISBN 0-470-13268-X , pp. 130 ( limited preview in Google Book search).
↑ Dilek, Nefise & Gunes, Bilal. (2009). Redetermination of Chromium (III) Acetylacetonate . Journal of Optoelectronics and Advanced Materials. 1.570-572.
↑ B. Morosin: The crystal structure of trisacetylacetonatochromium (III). In: Acta Crystallographica. 19, 1965, p. 131, doi : 10.1107 / S0365110X65002876 .
↑ Liang Xu, Mark L. Trudell: A mild and efficient oxidation of alcohols to aldehydes and ketones with periodic acid catalyzed by chromium (III) acetylacetonate. In: Tetrahedron Letters. 44, 2003, p. 2553, doi : 10.1016 / S0040-4039 (03) 00283-1 .

[Alfa-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h data sheet Chromium (III) 2,4-pentanedionate, 97% from AlfaAesar, accessed on May 1, 2019 ( PDF )(JavaScript required) .

[Sigma-2] ↑ ^a ^b ^c ^d ^e ^f data sheet Chromium (III) acetylacetonate, 99.99% trace metals basis from Sigma-Aldrich , accessed on April 30, 2019 ( PDF ).

[Therald_Moeller-3] Therald Moeller: Inorganic Syntheses, Volume 5 . John Wiley & Sons, 2009, ISBN 0-470-13268-X , pp. 130 ( limited preview in Google Book search).

[4] Dilek, Nefise & Gunes, Bilal. (2009). Redetermination of Chromium (III) Acetylacetonate . Journal of Optoelectronics and Advanced Materials. 1.570-572.

[DOI10.1107/S0365110X65002876-5] B. Morosin: The crystal structure of trisacetylacetonatochromium (III). In: Acta Crystallographica. 19, 1965, p. 131, doi : 10.1107 / S0365110X65002876 .

[DOI10.1016/S0040-4039(03)00283-1-6] Liang Xu, Mark L. Trudell: A mild and efficient oxidation of alcohols to aldehydes and ketones with periodic acid catalyzed by chromium (III) acetylacetonate. In: Tetrahedron Letters. 44, 2003, p. 2553, doi : 10.1016 / S0040-4039 (03) 00283-1 .