Acetophenone benzoylhydrazones as antioxidant agents: Synthesis, in vitro evaluation and structure-activity relationship studies
摘要:
Acetophenone and its analogues are naturally-occurring compounds found in many foods and plants. In this study, a series of acetophenone benzoylhydrazones 5a-o were designed and synthesized as new potential antioxidant agents. Designed molecules contain hydrazone and phenolic hydroxyl moieties which possibly contribute to antioxidant activity. The antioxidant properties of compounds 5a-o in terms of reducing ability and radical-scavenging activity were assessed by using FRAP and DPPH tests, respectively. While the unsubstituted compound 5a had the superior capacity in the FRAP assay, the 2,4-dihydroxyacetophenone analogue 5g was the most potent radical scavenger in the DPPH method. The antioxidant potential of representative compounds 5a and 5g was further confirmed by TEAC and ORAC assays. Cell viability assays revealed that while the promising compounds 5a and 5g had no significant toxicity against HepG2 and NIH3T3 cells, they potently protected HepG2 cells against H2O2 -induced oxidative damage at low concentrations. Furthermore, spectroscopic studies with different biometals demonstrated that 5g was able to interact with Cu2+ to form a 1:1 complex.
Synthesis, fluorescence study and biological evaluation of three Zn(II) complexes with Paeonol Schiff base
作者:Dong-dong Qin、Zheng-yin Yang、Gao-fei Qi
DOI:10.1016/j.saa.2009.06.037
日期:2009.10
synthesis of three Paeonol Schiff base ligand and their Zn(II) complexes are reported. The complexes were fully characterized by IR, (1)H NMR, elemental analysis and molar conductivity. The experiment results show the threeZn(II) complexes can emit bright fluorescence at room temperature in DMF solution and solid state. The fluorescence quantum yields (Phi) of three Schiff base ligands and their Zn(II) complexes
Synthesis and characterization of Mo(VI) complexes derived from ONO donor acylhydrazones
作者:Nancy Mathew、M.R. Prathapachandra Kurup
DOI:10.1016/j.saa.2011.01.021
日期:2011.5
Four new dioxomolybdenum(VI) complexes were prepared using different acylhydrazones. Hydrazones used for complexation were derived from 2-hydroxy-4-methoxybenzaldehyde, 2-hydroxy-4-methoxyacetophenone, benzhydrazide and nicotinoyl hydrazide. The complexes were characterized by various spectroscopic techniques, thermal and elemental analyses. The (1)H NMR and IR spectral data indicate tridentate nature of the ligands through enolization. IR spectra provide information about the dimeric nature of the complexes. The thermal analyses of the complexes showed the presence of lattice water in some of the complexes. (C) 2011 Elsevier B.V. All rights reserved.
Spectral studies of copper(II) complexes of tridentate acylhydrazone ligands with heterocyclic compounds as coligands: X-ray crystal structure of one acylhydrazone copper(II) complex
Six copper(II) complexes of 2-hydroxy-4-methoxybenzaldehyde nicotinoylhydrazone (H(2)hmbn), 2-hydroxy-4-methoxyacetophenone nicotinoylhydrazone (H(2)hman), 2-hydroxy-4-methoxybenzaldehyde benzoylhydrazone (H(2)hmbb) and 2-hydroxy-4-methoxyacetophenone benzoylhydrazone (H(2)hmab) have been synthesized. The complexes viz. [Cu(hmbn)](2)center dot 2H(2)O (1). [Cu(hman)](2) (2), [Cu(hmbb)](2)center dot 2H(2)O (3), [Cu(hmbb)phen]center dot 1(1/2)H2O (4). [Cu(hmbb)(bipy)center dot H2O] (5) and [Cu(hmab)phen] (6) were characterized by different physicochemical techniques. The crystal structure of [Cu(hman)phen] is obtained and it has a distorted square pyramidal geometry with pi-pi stacking interactions and significant C-H pi interactions. (C) 2011 Elsevier B.V. All rights reserved.
Evaluation of the antioxidant, DNA interaction and tumor cell cytotoxicity activities of Copper(II) complexes with Paeonol Schiff-base
作者:Dong-Dong Qin、Zheng-Yin Yang、Fu-Hong Zhang、Bo Du、Ping Wang、Tian-Rong Li
DOI:10.1016/j.inoche.2010.03.030
日期:2010.6
Herein, we report for the first time on the preparation of four Paeonol Schiff-base ligands: 1,2-Bis(2-hydroxy-4-methoxy-alpha-methylbenzylideneimino) ethane (H(2)L(1)), 2-hydroxy-4-methoxy-alpha-methylbenzylidene (benzoyl) hydrazone (HL(2)), 2-hydroxy-4-methoxyacetophenone-ethanolamine Schiff-base (HL(3)), and 2-hydroxy-4-methoxyacetophenone(2'-hydroxybenzoyl) hydrazone (H(2)L(4)), and their Cu(II) complexes, of which the structure of C(11)N(2)O(6)H(14)Cu(CuL(3)center dot NO(3)) was confirmed by X-ray diffraction. Antioxidant activities of four Cu(II) complexes were studied by the standard non-enzymatic NBT method and Fenton system, used to produce superoxide anion radicals and hydroxyl radicals, respectively. The results show these Cu(II) complexes have excellent antioxidant activities. DNA-binding and in vitro cytotoxicity experiments were utilized to further investigate the biological activities of C(11)N(2)O(6)H(14)Cu(CuL(3)center dot NO(3)). These results support C(11)N(2)O(6)H(14)Cu as a potential candidate for biological use because it shows not only high antioxidant and moderate DNA-binding activities, but also good tumor cell cytotoxicity activities in human cell lines carcinomas Hep-2 (larynx), for the range of concentrations tested. (C) 2010 Elsevier B.V. All rights reserved.