Chromium (III) acetylacetonate
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Chromium (III) acetylacetonate | ||||||||||||||||||
other names |
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Molecular formula | Cr (C 5 H 7 O 2 ) 3 | ||||||||||||||||||
Brief description |
purple colored odorless solid |
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properties | |||||||||||||||||||
Molar mass | 349.32 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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density |
1.35 g cm −3 |
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Melting point |
210 ° C |
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boiling point |
340 ° C |
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solubility |
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safety instructions | |||||||||||||||||||
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Toxicological data |
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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 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.
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 .