A highly selective and sensitive fluorescent turn-on chemosensor for Al<sup>3+</sup> based on a chromone Schiff base
作者:Chunjiao Liu、Zhengyin Yang、Mihui Yan
DOI:10.1080/00958972.2012.726987
日期:2012.11.10
A Schiff-base fluorescent sensor, 7-methoxychromone-3-carbaldehyde-(3′,4′-dimethyl)pyrrole hydrazone (MCPH), was synthesized. The new sensor showed high selectivity for Al3+ over other metal ions examined in acetonitrile. Upon binding Al3+, a significant fluorescence enhancement with a turn-on ratio over 101-fold was triggered. The detection limit of MCPH for Al3+ was 2.5 × 10−7 mol L−1.
Synthesis, Characterization, and the Antioxidative Activity of 4-{[(3,4-Dimethyl pyrrole-2-carbonyl)hydrazono](phenyl)methyl}-3-methyl-1-phenylpyrazol-5-ol and Its Zinc(II), Copper(II), Nickel(II) Complexes
作者:Qian Wang、Yuan Wang、Zheng-yin Yang
DOI:10.1248/cpb.56.1018
日期:——
A new ligand H3L, 4-[(3,4-dimethylpyrrole-2-carbonyl)hydrazono](phenyl)methyl}-3-methyl-1-phenylpyrazol-5-ol and its three transition metal complexes, M(H2L)OAc·H2O (M=Cu, Ni), Zn(H2L)2 have been synthesized and fully characterized on the basis of ESI-MS, elemental analyses, molar conductivities, IR spectra and 1H-NMR. In addition, their antioxidative activities have been investigated by spectrophotometer measurements. The experimental results show that the complexes have higher activity in the suppression of O2·− and ·OH than the free ligand.
Crystal structures, DNA-binding and cytotoxic activities studies of Cu(II) complexes with 2-oxo-quinoline-3-carbaldehyde Schiff-bases
作者:Zeng-Chen Liu、Bao-Dui Wang、Bo Li、Qin Wang、Zheng-Yin Yang、Tian-Rong Li、Yong Li
DOI:10.1016/j.ejmech.2010.08.060
日期:2010.11
Three novel 2-oxo-quinoline-3-carbaldehyde Schiff-bases and their Cu(II) complexes were synthesized. The molecular structures of Cu(II) complexes were determined by X-ray crystal diffraction. The DNA-binding modes of the complexes were also investigated by UV vis absorption spectrum, fluorescence spectrum, viscosity measurement and EB-DNA displacement experiment. The experimental evidences indicated that the ligands and Cu(II) complexes could interact with CT-DNA (calf-thymus DNA) through intercalation, respectively. Comparative cytotoxic activities of ligands and Cu(II) complexes were also determined by MTT [3-(4,5-dimethyl-2-thiazoyl)-2,5-diphenyl-2H-tetrazolium bromide] and SRB (sulforhodamine B) methods. The results showed that the three Cu(II) complexes exhibited more effective cytotoxic activity against HL60 cells and HeLa cells than corresponding ligands. Also, CuL3 showed higher cytotoxic activity than CuL1 and CuL2 (C) 2010 Elsevier Masson SAS. All rights reserved.