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. 2013 Jul 1;18(7):7631-45.
doi: 10.3390/molecules18077631.

Synthesis and characterization of some new complexes of magnesium (II) and zinc (II) with the natural flavonoid primuletin

Valentina Uivarosi  1 , Mihaela Badea, Rodica Olar, Constantin Draghici, Stefania Felicia Barbuceanu
Affiliations

Synthesis and characterization of some new complexes of magnesium (II) and zinc (II) with the natural flavonoid primuletin

Valentina Uivarosi et al. Molecules. .

Abstract

Two new metal complexes formulated as [Mg(L)2(H2O)2]·H2O (1) and [Zn(L)2(H2O)2]·0.5H2O (2), where HL = 5-hydroxyflavone (primuletin), have been synthesized and characterized by elemental and thermal analyses, molar conductance, IR, UV-Vis, 1H- and 13C-NMR, fluorescence and mass spectra. In solid state, complexes had shown higher fluorescence intensities comparing to the free ligand, and this behavior is appreciated as a consequence of the coordination process.

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Figures

Figure 1
Figure 1
The structure of primuletin (5-hydroxyflavone).
Scheme 1
Scheme 1
The reaction scheme for the synthesis of the complexes.
Figure 2
Figure 2
IR spectra of (a) 5-hydroxyflavone (HL). (b) [Mg(L)2(H2O)2]·H2O. (c) [Zn(L)2(H2O)2]·0.5H2O.
Figure 3
Figure 3
Diffuse reflectance electronic spectra of (a) 5-hydroxyflavone (HL). (b) [Mg(L)2(H2O)2]·H2O. (c) [Zn(L)2(H2O)2]·0.5H2O.
Figure 4
Figure 4
Mass spectra of (a) [Mg(L)2(H2O)2]·H2O. (b) [Zn(L)2(H2O)2]·0.5H2O.
Figure 5
Figure 5
TG and DTA curves of [Mg(L)2(H2O)2]·H2O.
Figure 6
Figure 6
TG and DTA curves of [Zn(L)2(H2O)2]·0.5H2O.
Figure 7
Figure 7
The emission spectra at λexc = 400 nm of (a) 5-hydroxyflavone (HL). (b) [Mg(L)2(H2O)2]·H2O. (c) [Zn(L)2(H2O)2]·0.5H2O.
Figure 8
Figure 8
The emission spectra at λexc = 429 nm of (a) 5-hydroxyflavone (HL). (b) [Mg(L)2(H2O)2]·H2O. (c) [Zn(L)2(H2O)2]·0.5H2O.
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