共查询到19条相似文献,搜索用时 234 毫秒
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在无水乙醇溶液中,以邻菲啰啉(Phen)、柠檬酸(H3Cit)为配体,合成了7种稀土三元固体配合物.通过元素分析、摩尔电导率测定、红外光谱和热重差热分析等手段确定配合物的组成为RE(Cit)·Phen·2H2O(RE=La3+,Pr3+,Nd3+,Sm3+, Eu3+,Tb3+,Dy3+). 相似文献
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采用溶液反应法合成了掺杂铽的稀土酒石酸配合物Ln2 -xTbxL3(Ln =Y、La、Gd) ,通过元素分析、X射线粉末衍射及红外光谱等对其组成进行了表征 ,测定了该系列配合物的荧光光谱。实验结果表明 ,该系列配合物的组成为Ln2 -xTbxL3·6H2 O(Ln =Y、La、Gd) ,该掺杂配合物比单纯配合物Tb2 L3 具有更好的发光性能 ,而且当x =0 .7~ 1.5时 ,该掺杂配合物的发光最强。据此探讨同多核稀土酒石酸配合物及杂多核稀土酒石酸配合物发光机理 相似文献
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稀土-蛋氨酸-邻菲咯啉配合物的合成、表征及抗菌活性研究 总被引:3,自引:1,他引:2
采用冷凝回流法合成了4种新型稀土(镧、铕、钐和钕)-蛋氨酸-邻菲咯啉三元配合物,通过元素分析、EDTA-滴定、摩尔电导、红外光谱,确定了配合物的组成为RE(Met)_3phenCl_3·3H_2O(RE:La~(3+)、Eu~(3+)、Sm~(3+)、Nd~(3+);Met=L-蛋氨酸;phen=邻菲咯啉).抗菌活性的研究表明,与配体相比,稀土三元配合物对大肠杆菌(Escherichia coli)和金黄色葡萄球菌(Staphylococcus aureus)均具有更强的抑菌能力. 相似文献
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合成了稀土高氯酸盐与咪唑、DL α 丙氨酸的4种配合物晶体。经傅里叶变换红外光谱(FTIR)、元素分析和化学分析测定后确定其组成为[Ln(C3H7NO2)x(C3H4N2)(H2O)](ClO4)3(Ln=La,x=3;Ln=Pr,Nd,Sm,x=2)。用差示扫描量热法(DSC)测定了4种配合物的热分解数据,4个配合物开始熔化分解的温度分别为502 5K,532 4K,495 7K,516 7K,配合物有较高的热稳定性。 相似文献
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《硅酸盐学报》2021,(4)
在乙醇体系中,由双配体间苯二甲酸(H_2PIA)和乙酰丙酮(Hacac)与稀土硝酸盐反应合成了相应的4种稀土三元配合物[Ln_2(PIA)_2(acac)_2](Ln=Sm (1),Eu (2),Tb (3),Dy (4)),用元素分析、红外光谱、热重分析进行表征,并推断了其可能的结构。为便于比较三元配合物的发光性能,同时也制备了相应的稀土间苯二甲酸[Ln_2(PIA)_3(H_2O)_4]和稀土乙酰丙酮二元配合物[Ln(acac)_3(H_2O)]。室温下,测定了三元和二元配合物的荧光光谱,结果表明,所有配合物均显示稀土中心离子特有的发射,三元配合物的发光强度好于二元配合物(除了镝配合物),说明双配体对中心离子有协同敏化作用,其实验结果用配体最低三重态能级T_(1 )(来自Gauss理论计算)与中心金属离子最低激发态能级的匹配情况予以解释。 相似文献
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合成了3-苯甲酰基-2-庚基苯并二氢吡喃-4-酮(L_1)、3-苯甲酰基-2-苯基苯并二氢吡喃-4-酮(L_2) 2种配体。分别以L_1和L_2为第1配体,水为第2配体在溶剂乙醇中与EuCl_3反应(pH=7~8),合成了2种新的稀土配合物。运用元素分析、红外光谱、荧光光谱、热重分析和扫描电子显微镜对相关物质进行了表征。结果表明:2种配合物的组成分别为Eu(L_1)_3·2H_2O和Eu(L_2)_3·2H_2O;荧光光谱表明,2种配合物都能发出很强的铕离子特征荧光,其中配合物Eu(L_2)_3·2H_2O的荧光强度更强,具有更好的荧光性能。 相似文献
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本文以聚乙烯吡咯烷酮为表面活性剂,在水溶液中合成了纳米均苯三甲酸铽配合物.并通过红外光谱、透射电镜、荧光光谱等表征手段对其进行了表征.结果表明,纳米均苯三甲酸铽的荧光光谱在主要发射峰的峰位、峰强、半高宽和最强峰与次强峰的强度之比等方面与普通均苯三甲酸铽有明显差别. 相似文献
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合成了一种新的锌(Ⅱ)-色氨酸-邻菲咯啉配合物[Zn(Trp)(phen)2]Cl·7H2O(Ⅰ)(Trp为L-色氨酸离子,phen为邻菲咯啉)。通过元素分析、红外光谱及热重一差热分析对其进行了结构表征。采用电子吸收光谱法、荧光光谱法及琼脂糖凝胶电泳法考察了其与DNA的作用,研究了配合物对斑马鱼胚胎的生物毒性,并与2种已知结构的锌-邻菲咯啉配合物[zn(phen)2]Cl2·5H2O(Ⅱ)和[zn(phen)]Cl2(Ⅲ)进行了比较。结果表明,配合物与鲑鱼精DNA作用大小顺序为配合物Ⅰ〉配合物Ⅱ〉配合物Ⅲ.但作用方式不同;在抗坏血酸存在下,配合物Ⅰ对pBR322DNA的切割作用最强;配合物对斑马鱼胚胎毒性作用大小顺序为配合物Ⅱ〉配合物I〉配合物Ⅲ。 相似文献
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In this study, the luminescent macromolecular lanthanide complexes Ln‐PSt/AA (Ln = Eu and Tb; St = styrene; AA = acrylic acid) have been synthesized, and an extensive characterization has been carried out by means of elemental analysis, FTIR, thermal analysis, and fluorescence determination. The results showed that the carboxylic groups on the chain of the polymers acted as bidentate ligands coordinated to lanthanide ions; and the coordination degree of ? COO?/Ln3+ in the macromolecular complexes was closely dependent on both the pH value of the solution and the molar ratio of St to AA in the polymeric ligands. Thermal analysis manifested that these Ln‐PSt/AA (Ln = Eu and Tb) complexes had high thermal stability and solvent resistance, and these macromolecular complexes were highly crosslinked. The fluorescence determination indicated that Ln‐PSt/AA complexes could emit characteristic fluorescence with comparatively high brightness and good monochromaticity, and the fluorescence intensity changed with increasing lanthanide ions content. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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In this study, the luminescent macromolecular lanthanide complexes with the copolymers of styrene (St) and 2‐butenedioic acid (z)‐mono‐ethyl ester (BAME) have been synthesized, and an extensive characterization has been carried out by means of elemental analysis, FTIR, thermal analysis, and fluorescence determination. The results showed that the carboxylic groups on the chain of the polymers acted as bidentate ligands coordinated to lanthanide ions; and the coordination degree of ‐COO?/Ln3+ in the macromolecular complexes was closely dependent on both the pH value of the solution and the molar ratio of St to BAME in the polymeric ligands. Thermal analysis manifested that the macromolecular complexes Ln‐PSt/BAME (Ln = Y, Sm, Dy, Eu, and Tb) were highly crosslinked and had high thermal stability and solvent resistance. The fluorescence determination indicated that Ln‐PSt/BAME complexes could emit characteristic fluorescence with comparatively high brightness and good monochromaticity, and the fluorescence intensity increased with an increasing of lanthanide content. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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Mitochondrial Fragmentation Is an Important Cellular Event Induced by Ruthenium(II) Polypyridyl Complexes in Osteosarcoma Cells 下载免费PDF全文
Yanxin Du Xiaoyan Fu Hong Li Bolai Chen Yuhai Guo Guoyi Su Hu Zhang Feipeng Ning Yongpeng Lin Wenjie Mei Tianfeng Chen 《ChemMedChem》2014,9(4):714-718
A series of ruthenium(II) polypyridyl complexes were synthesized and evaluated for their in vitro anticancer activities. The results showed that ruthenium polypyridyl complexes, especially [Ru(bpy)2(p‐tFPIP)]2+ ( 2 a ; bpy=bipyridine, tFPIP=2‐(2‐trifluoromethane phenyl)imidazole[4,5‐f][1,10]phenanthroline), exhibited novel anticancer activity against human cancer cell lines, but with less toxicity to a human normal cell line. The results of flow cytometry and caspase activities analysis indicated that the 2 a ‐induced growth inhibition against MG‐63 osteosarcoma cells was mainly caused by mitochondria‐mediated apoptosis. DNA fragmentation and nuclear condensation as detected by TUNEL–DAPI co‐staining further confirmed 2 a ‐induced apoptotic cell death. Further, fluorescence imaging revealed that ruthenium(II) polypyridyl complexes could target mitochondria to induce mitochondrial fragmentation, accompanied by depletion of mitochondrial membrane potential. Taken together, these findings suggest a potential application of theses ruthenium(II) complexes in the treatment of cancers. 相似文献
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In this research, a series of lanthanide complexes with a low molecular weight hindered amine have been synthesized for the first time from lanthanide chloride and bis‐(2,2,6,6‐tetramethyl‐4‐piperidinyl)‐decanedioicacid (L) by simply using a solvent‐free solid‐state reaction. Elemental and thermo analysis suggest that the component of the complexes is LnLCl3 2H2O (Ln = Y, La, Nd, Sm, Eu, Gd, Dy, Er). Infrared spectra indicate that the lanthanide ions are coordinated with oxygen atoms of the carbonyl group in ligand. Polypropylene films containing the ligand and complexes were prepared by melt blending and compression molding, and were exposed to UV irradiation before and after ethanol extraction. The measurements of carbonyl index, thermal decomposition temperature, and tensile elongation at break reveal that these complexes have comparable photostabilizing efficiency and improved extraction resistance compared to the ligand alone. This study suggests that hindered‐amine lanthanide complexes can provide novel approach to the cheap and efficient light stabilizers. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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从化学吸收-生物还原集成系统内的混合培养物中分离得到一株高效还原Fe(III)Cit(Cit:柠檬酸)的菌株,对其进行分子生物学鉴定,归属为肠球菌属,命名为Enterococcussp.FR-3。同时,考察了碳源种类和浓度、氮源种类和浓度、菌种接种量以及pH等因素对FR-3生长及Fe(III)Cit还原性能的影响,优化微生物生长及还原Fe(III)Cit的条件。结果表明,葡萄糖为FR-3生长和Fe(III)Cit还原的最佳碳源,其最适添加浓度为1000mg·L-1。NH4Cl作为氮源时菌种FR-3生长和Fe(III)Cit还原效果明显优于NaNO2,且NH4Cl只要维持100mg·L-1左右即可。菌种接种量在150mg·L-1时Fe(III)Cit还原率达到最大。过量碳源、氮源用量以及或接种量对还原过程没有促进作用。适合Fe(III)Cit还原的pH值范围为6.6~7.0。 相似文献