Lanthanide benzoates with 2,6-di-tert-butylphenol (cas 27178-34-3) moiety: Synthesis, luminescent and antioxidant properties

Add time:07/16/2019    Source:sciencedirect.com

A series of rare-earth metal carboxylates M(RCOO)3 (M = La (1), Eu (2), Gd (3), Tb (4), Er (5); R = 3,5-di-tert-butyl-4-hydroxyphenyl) was synthesized and characterized by elemental analysis, NMR, IR spectroscopy and MALDI-TOF spectroscopy. The photoluminescent (PL) properties of 1–5 were investigated. The electron transfer reactions were examined in CUPRAC-test. The radical scavenging activity of the complexes was measured spectrophotometrically using a DPPH-test. The EC50 values for complexes are varied from 32 to 57 μM while the EC50 for RCOOH is 79 μM. The inhibition of lipoxygenase (LOX-1B) in the presence of compounds was evaluated. It was found that complexes are weak inhibitors, while RCOOH is inactive. The lanthanum complex was found to be the most efficient inhibitor of lipoxygenase. Thus, the lanthanide carboxylates with 2,6-di-tert-butylphenol moiety could be used as potential antioxidants and luminescent materials.

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