New complexes of La(III), Ce(III), Pr(III), Nd(III), Sm(III), Eu(III) and Gd(III) ions with morin

Kinetics and mechanism of naringenin reaction with Ce(IV) in different aqueous solutions of dimethylsulfoxide

“…This confirms the function of this group in forming the complex species but 4 -OH at ring B is not involved in complexation. This result is in accordance with the work of Woznicka et al [18], who found similar shifts in the case of Ce(III) with morin. Therefore, the differences in the electronic absorption spectra of the complex species lead to the conclusion that Ce(IV) possibly interacts with the 5-OH and 4-oxo groups and the other OH groups are not involved in coordination.…”

Spectroscopic studies on the interaction of morin–Eu(III) complex with calf thymus DNA

“…The effect of hauling electrons caused by the bond of Eu(III) with morin results in a lower absorbance at 265 nm. This rationale is also in accordance with previous work, which demonstrated that the 3-hydroxyl and 4-carbonyl structure in ring C of morin is important for rare earth metal chelating [19,35]. The curves of absorbance versus [Eu(III)]/[morin] molar ratio plotted at 390 and 431 nm allow us to find a stoichiometry of 1:3 for the complex (Fig.…”

Inhibition of thioredoxin reductase by lanthanum chloride

“…Conversely, calcium and lanthanum ions are hard metals and show a preference for hard bases such as carboxylate anions and dissociated hydroxyl groups. In fact, in addition to its interaction with chelators such as EDTA, lanthanum ion forms complexes with citrate, flavonoids and other products containing oxygen and nitrogen ligands [24,25,51,52]. Interestingly, classical chelators such as EDTA do not modify the inhibitory action exerted by the soft noble metals on TrxR [33] further supporting the previous considerations.…”