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Intramolecular Dynamics and Molecular Structure of Europium(III) Chelate Complexes with Crown Ethers as Studied by NMR Spectroscopy

✍ Scribed by Sergey P. Babailov; Dmitry A. Mainichev; Lubov D. Nikulina; Svetlana S. Petrova

Publisher: Springer Netherlands
Year: 2005
Tongue: English
Weight: 318 KB
Volume: 51
Category: Article
ISSN: 0923-0750
DOI: 10.1007/s10847-004-2385-5

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## Abstract To prevent the precipitation reaction between glycyrrhizin (**1**) and berberine (**3**) in the decoctions of __Glycyrrhiza__/__Coptis__ rhizome or __Glycyrrhiza__/__Phellodendron__ bark, the presence of cyclodextrin (CD) in the mixture was proven to be effective. The preventing effect