Synthesis and physicochemical properties of the Al(III), Ga(III) and In(III) complexes with chrysin

Phenolic compound explorer: A mid-infrared spectroscopy database

“…Because only the pyrylium part of flavylium has been described in the literature [26], the interpretation of some anthocyanin bands was based on the pyrylium nucleus that presented ring in-plane deformation vibration bands in the 1650-1615 cm Table 3 between 1670 and 1625 cm À1 (mainly a band around 1655 cm À1 ) were characteristic of ketone C¼O (ArÀ ÀC¼O) stretching vibrations of cyclic conjugate (and planar) systems [26,28,29,38,42,43]. In addition to bands characteristic of benzene, the literature [31] shows that the specific bands of g-pyrone are due to a combination of C¼O and C¼C stretching vibrations localized around 1570-1540 cm…”

Raman and surface-enhanced Raman spectra of chrysin, apigenin and luteolin

“…Even though it contains two hydroxyl groups, this molecule is relatively insoluble in water, making the preparation of the samples difficult. Chrysin and its complexes with Al 3+ , Ga 3+ and In 3+ have been studied by IR, UV-vis and NMR [5]. The IR spectra shows n(OH) bands at 3600-2400 cm À1 , n(C O) at 1655 cm À1 , aromatic n(C C) at 1505 cm À1 , other bands at 1460 and 1168 cm À1 , g(CH) at 850 cm À1 and 815 cm À1 .…”

Investigations of selected properties of pharmacologically active compounds by chromatographic and potentiometric methods on the chrysin example

“…The mean number of protons connected with the appropriate base was calculated for each experimentally determined pH value from the formula 17 : (6) where: [H + ] is equilibrium concentration of hydrogen ions, K w is ionic product of water (K w = 2.29 . 10 -14 for I = 0.1 (NaClO 4 ) and T=298 K), c L is total anion concentration of weak acid ions, and H t is total concentration of the protons capable of dissociation.…”

“…The solid complexes of several metal ions: Co(II), Ni(II), Cu(II), Cd(II), Pb(II) and Fe(III) with chrysin were separated 6,7 . Determination of the dissociation constants (pK) of this compound can lead to better understanding of metal-complexing properties of this molecule in the water-methanol solution and allow better separation of this compound from their biological media.…”