Eu (dmp) 3
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| Surname | Eu (dmp) 3 | ||||||||||||||||||
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| Molecular formula | C 30 H 57 EuO 6 | ||||||||||||||||||
| Brief description |
yellow powder |
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| Molar mass | 701.77 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| Melting point |
188-192 ° C |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
Eu (dmp) 3 is a chemical compound with the semi- structural formula Eu [OCC (CH 3 ) 3 CHCOC (CH 3 ) 3 ] 3 . This coordination compound is mainly used in NMR spectroscopy used to shift signals ( shifting ). Eu (dmp) 3 is one of the first lanthanide shift reagents and was first used by Hinckley in 1969 in the study of cholesterol .
Structure and reactivity
Eu (dmp) 3 consists of three bidentate dmp ligands that bind to an Eu center. The dipivaloyl methanoate (dmp) is structurally related to the acetylacetonate (acac), with the two methyl groups being substituted by tert- butyl groups. The metal has an electron configuration f 6 . The six electrons are unpaired - each is in a different singly occupied f orbital - which results in a pronounced paramagnetism of the complex. The complex is a Lewis acid and can increase its coordination number from 6 to 8. The compound has a high affinity for hard Lewis bases, such as oxygen atoms in ethers and nitrogen atoms in amines.
use
Eu (dmp) 3 is mainly used in NMR spectroscopy, where it has a wide range of applications as lanthanoid shift reagents . It can be used, among other things, to determine the molar mass of polypropylene glycol , as well as in structure elucidation. It is also used in many studies on the mode of action of shift reagents.
Individual evidence
- ↑ a b c Entry on Tris (2,2,6,6-tetramethyl-3,5-heptanedionato) europium (III) at TCI Europe, accessed on February 7, 2020.
- ^ Conrad C. Hinckley: Paramagnetic Shifts in Solutions of Cholesterol and the Dipyridine Adduct of Trisdipivalomethanatoeuropium (III). A shift reagent . In: Journal of the American Chemical Society . tape 91 , no. August 18 , 1969, p. 5160-5162 , doi : 10.1021 / ja01046a038 .
- ↑ Floyd F.-L. Ho: Application of the Eu (DPM) 3 chemical shift reagent to the determination of the molecular weight of poly (propylene glycol) by NMR . In: Journal of Polymer Science Part B: Polymer Letters . tape 9 , no. 7 , July 1971, p. 491–495 , doi : 10.1002 / pol . 1971.110090704 .
- ↑ ME Perel'son, AA Kir'yanov, Yu. E. Sklyar, VV Vandyshev: Use of the paramagnetic shift agent Eu (DPM) 3 for studying the structure and stereochemistry of conferol and conferone . In: Chemistry of Natural Compounds . tape 9 , no. 6 , November 1973, p. 696-698 , doi : 10.1007 / BF00565788 .