Synthesis, structure, and photoluminescence properties of Zn(II) complexes with 2-styryl derivatives of 8-hydroxyquinoline
摘要:
Novel Zn(II) complexes with 2-styryl-8-hydroxyquinoline were synthesized and characterized by H-1, F-19, and C-13 NMR spectroscopy and X-ray diffraction analysis. Photoluminescence properties of the ligands and complexes in solutions were studied. The effect of substituents in the quinoline and phenylethenyl fragments on spectral characteristics was discussed.
A 2-substituted-8-hydroxyquinoline ligand (E)-2-[2-(4-nitrophenyl)ethenyl]-8-hydroxyquinoline (HL) was synthesized and characterized by ESI-MS, NMR spectroscopy and elemental analysis. Using solvothermal method, a dimeric complex [Zn2Cl2L2]center dot 2DMF (1) was fabricated by self-assembly of Zn(II) ions with ligand HL, and characterized with single-crystal X-ray diffractions, powder X-ray diffractions (PXRD), thermal analyses (TGA) and elemental analyses (EA). Complex 1 features a lamellar solid constructed by aromatic stacking interactions and nonclassical C-H center dot center dot center dot O hydrogen bonds. To further investigate the property of the above complex, the photoluminescent properties of 1 are also discussed. (C) 2012 Elsevier B.V. All rights reserved.
New multi-target-directed small molecules against Alzheimer's disease: a combination of resveratrol and clioquinol
作者:Fei Mao、Jun Yan、Jianheng Li、Xian Jia、Hui Miao、Yang Sun、Ling Huang、Xingshu Li
DOI:10.1039/c4ob00998c
日期:——
Alzheimer's disease (AD) is currently one of the most difficult and challenging diseases to treat. Based on the ‘multi-target-directed ligands’ (MTDLs) strategy, we designed and synthesised a series of new compounds against AD by combining the pharmacophores of resveratrol and clioquinol. The results of biological activity tests showed that the hybrids exhibited excellent MTDL properties: a significant ability to inhibit self-induced β-amyloid (Aβ) aggregation and copper(II)-induced Aβ aggregation, potential antioxidant behaviour (ORAC-FL value of 0.9–3.2 Trolox equivalents) and biometal chelation. Among these compounds, (E)-5-(4-hydroxystyryl)quinoline-8-ol (10c) showed the most potent ability to inhibit self-induced Aβ aggregation (IC50 = 8.50 μM) and copper(II)-induced Aβ aggregation and to disassemble the well-structured Aβ fibrils generated by self- and copper(II)-induced Aβ aggregation. Note that 10c could also control Cu(I/II)-triggered hydroxyl radical (OH˙) production by halting copper redox cycling via metal complexation, as confirmed by a Cu–ascorbate redox system assay. Importantly, 10c did not show acute toxicity in mice at doses of up to 2000 mg kg−1 and was able to cross the blood–brain barrier (BBB), according to a parallel artificial membrane permeation assay. These results indicate that compound 10c is a promising multifunctional compound for the development of novel drugs for AD.
Synthesis, structure, and photoluminescence properties of Zn(II) complexes with 2-styryl derivatives of 8-hydroxyquinoline
作者:E. V. Nosova、G. N. Lipunova、T. V. Stupina、P. A. Slepukhin、M. S. Valova、V. N. Charushin
DOI:10.1134/s1070363214090229
日期:2014.9
Novel Zn(II) complexes with 2-styryl-8-hydroxyquinoline were synthesized and characterized by H-1, F-19, and C-13 NMR spectroscopy and X-ray diffraction analysis. Photoluminescence properties of the ligands and complexes in solutions were studied. The effect of substituents in the quinoline and phenylethenyl fragments on spectral characteristics was discussed.