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Identification and Structural Assessment of Alkaline-Earth Metal Complexes with Flavonols by FAB Mass Spectrometry

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Abstract

Complexation of a series of flavonols with Mg2 +, Ca2 +, and Ba2 + ions was studied by FAB mass spectrometry. The mass spectra of flavonol solutions containing magnesium ions revealed formation of 1 : 2 complexes MgL2, undetectable by spectrophotometric and spectrofluorimetric methods. Experiments with a crown-substituted flavonol revealed formation of not unly previously known chelate complexes MgL and Mg2L, but also of the 1 : 2 complex MgL2 and crown complex MgHL. The barium ions form with the crown-substituted flavonol two types of “sandwich” complexes: Ba(HL)2 and Ba2(HL)2. With the Ca2 + ions, such complexes are not formed, and only the fragmentation product of the complex Ca(HL)2 was detected.

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Munoz, A., Roshal', A.D., Richelme, S. et al. Identification and Structural Assessment of Alkaline-Earth Metal Complexes with Flavonols by FAB Mass Spectrometry. Russian Journal of General Chemistry 74, 438–445 (2004). https://doi.org/10.1023/B:RUGC.0000030403.41976.5c

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  • DOI: https://doi.org/10.1023/B:RUGC.0000030403.41976.5c

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