A new cyclometalated platinum complex containing 2, 5-bis(naphthalene-1-yl)-1,3,4-oxadiazole ligand was synthesized and characterized. The UV-Vis absorptions and photoluminescent properties of the ligand and its plati...A new cyclometalated platinum complex containing 2, 5-bis(naphthalene-1-yl)-1,3,4-oxadiazole ligand was synthesized and characterized. The UV-Vis absorptions and photoluminescent properties of the ligand and its platinum complex were investigated. A characteristic metal-ligand charge transfer absorption peak at 439 nm in the UV spectrum and a strong emission peak at 625 nm in the photoluminescence spectrum were observed for this complex in dichloromethane. Cyclic voltammtry (CV) analysis shows that the EHOMO (energy level of the highest occupied molecular orbital) and ELUMO (energy level of the lowest unoccupied molecular orbital) of the platinum complex are about 、5.69 and 、3.25 eV, respectively, indicating that the oxadiazole-based platinum complex has a potential application in electrophosphorescent devices used as a red-emitting material.展开更多
The stability constants of some ternary mixed-ligand complexes, Pt(Phen)(CA)+, where Phen=1,10-phenanthroline and CA- =carboxylate, were determined by means of potentiometric pH titration in aqueous solutions(I=0.1 mo...The stability constants of some ternary mixed-ligand complexes, Pt(Phen)(CA)+, where Phen=1,10-phenanthroline and CA- =carboxylate, were determined by means of potentiometric pH titration in aqueous solutions(I=0.1 mol/L, KNO 3; 25 ℃), and the stability of them was compared with that of the corresponding binary complexes. It was revealed that the ternary complexes containing phenylalkane carboxylates ligands(PCA-) are much more stable than those formed with formate and acetate. The results indicate that there exist the intramolecular aromatic-ring interactions between the phenanthroline ring of Phen and the phenyl moiety of ligand PCA- in the ternary mixed-ligand Pt(Phen)(PCA)- complexes. The extent of the stacking interactions, which depends on the number of methylene groups between the phenyl moieties and the coordinated phenylalkane carboxylate groups, was calculated. The best-fitted stack was obtained for the complexes with 2-phenylacetate and 3-phenylpropionate as the ligands.展开更多
Seven novel platinum （Ⅱ） complexes [ Pt（Ⅱ） （NH3） （CH3NH2）X2] （Ⅰ-Ⅶ ） （ X： CH3COO^-, CH2CICOO^- , CHCI2COO^- , C6H5-COO^- , p-CH3O--C6H4-COO^- , p-NH2-C6H4-COO^- , p-NO2--C6H4- COO^-） were prepared and ...Seven novel platinum （Ⅱ） complexes [ Pt（Ⅱ） （NH3） （CH3NH2）X2] （Ⅰ-Ⅶ ） （ X： CH3COO^-, CH2CICOO^- , CHCI2COO^- , C6H5-COO^- , p-CH3O--C6H4-COO^- , p-NH2-C6H4-COO^- , p-NO2--C6H4- COO^-） were prepared and characterized by means of elemental analysis, molar conductivity, thermal analysis, IR, UV, and ^1H NMR spectrometries. The cytotoxicity against HCT-8, BGC-823, MCF-7, EJ, and HL-60 cell lines increases in the following sequence： cisplatin 〉 Ⅳ 〉 Ⅴ 〉 Ⅵ 〉 Ⅶ 〉 Ⅰ 〉 Ⅱ 〉 Ⅲ. Moreover, the complexes （ Ⅰ --Ⅻ） display substantially greater activities agaist EJ and HL-60 cell lines than those against the cell lines from other carcinomas. They can induce a concentration-dependent accumulation of HL-60 cells in the G2/M phase of the cell cycle as cisplatin. There is no significant correlation between total DNA platination levels and cytotoxicity of the complexes.展开更多
Cis-diaminedithiocyanatoplatinum(Ⅱ)(cis-[Pt(SCN)2(NH3)2])was prepared and characterized through content analysis of Pt,MS,IR.The results show that the complex has cis configuration and the bond type of Pt and SCN-is ...Cis-diaminedithiocyanatoplatinum(Ⅱ)(cis-[Pt(SCN)2(NH3)2])was prepared and characterized through content analysis of Pt,MS,IR.The results show that the complex has cis configuration and the bond type of Pt and SCN-is Pt-S.When the aqueous solution of the complex was stored for one week,an orange-yellow precipitation appeared,different from the complex with light yellow color.Further comparative studies of these two complexes suggested that the precipitation is cis-[Pt(NCS)2(NH3)2],the linkage isomerism of cis-[Pt(SCN)2(NH3)2].The mechanism of the isomerism reaction is also discussed.展开更多
The stability constants of the ternary mixed ligand complexes Pt(Phen)(CA) +(Phen=1,10 Phenanathroline,CA=carboxylate Ligands) were determined by potentiometric pH titration in aqueous solution and in 30～90%(V/V) aqu...The stability constants of the ternary mixed ligand complexes Pt(Phen)(CA) +(Phen=1,10 Phenanathroline,CA=carboxylate Ligands) were determined by potentiometric pH titration in aqueous solution and in 30～90%(V/V) aqueous ethanal(I=0.1mol·L -1 ,KNO 3;25℃).The difference of stability among the different complexes was compared and discussed,and the percentages of the stacked isomers in the ternary mixed ligand complexes Pt(Phen)(PCA) +(PCA=2 phenylacetate and 3 phenylpropionate) was calculated.The experimental results indicate that the extent of the intramolecular aromatic ring stacking interaction in the ternary mixed ligand Pt(Phen)(PCA) + complexes depends on the polarity of the solution.The weaker the polarity of the solution,the more notable the intramolecular aromatic ring stacking interaction,the larger the percentage of the stacked isomers in the ternary complexes,and the more stable the ternary mixed ligand complexes.展开更多
基金Project(50473046) supported by the National Natural Science Foundation of ChinaProject(204097) supported by the Science Foundation of the Ministry of Education of China+1 种基金Project(04JJ1002) supported by the Outstanding Youth Foundation of Hunan Province,ChinaProject(06JJ2008) supported by the Natural Science Foundation of Hunan Province,China
文摘A new cyclometalated platinum complex containing 2, 5-bis(naphthalene-1-yl)-1,3,4-oxadiazole ligand was synthesized and characterized. The UV-Vis absorptions and photoluminescent properties of the ligand and its platinum complex were investigated. A characteristic metal-ligand charge transfer absorption peak at 439 nm in the UV spectrum and a strong emission peak at 625 nm in the photoluminescence spectrum were observed for this complex in dichloromethane. Cyclic voltammtry (CV) analysis shows that the EHOMO (energy level of the highest occupied molecular orbital) and ELUMO (energy level of the lowest unoccupied molecular orbital) of the platinum complex are about 、5.69 and 、3.25 eV, respectively, indicating that the oxadiazole-based platinum complex has a potential application in electrophosphorescent devices used as a red-emitting material.
基金Supported by the Foundation of Academ y L eader of Zhejiang Gongshang U niversity(No.19972 0 0 2 )
文摘The stability constants of some ternary mixed-ligand complexes, Pt(Phen)(CA)+, where Phen=1,10-phenanthroline and CA- =carboxylate, were determined by means of potentiometric pH titration in aqueous solutions(I=0.1 mol/L, KNO 3; 25 ℃), and the stability of them was compared with that of the corresponding binary complexes. It was revealed that the ternary complexes containing phenylalkane carboxylates ligands(PCA-) are much more stable than those formed with formate and acetate. The results indicate that there exist the intramolecular aromatic-ring interactions between the phenanthroline ring of Phen and the phenyl moiety of ligand PCA- in the ternary mixed-ligand Pt(Phen)(PCA)- complexes. The extent of the stacking interactions, which depends on the number of methylene groups between the phenyl moieties and the coordinated phenylalkane carboxylate groups, was calculated. The best-fitted stack was obtained for the complexes with 2-phenylacetate and 3-phenylpropionate as the ligands.
文摘Seven novel platinum （Ⅱ） complexes [ Pt（Ⅱ） （NH3） （CH3NH2）X2] （Ⅰ-Ⅶ ） （ X： CH3COO^-, CH2CICOO^- , CHCI2COO^- , C6H5-COO^- , p-CH3O--C6H4-COO^- , p-NH2-C6H4-COO^- , p-NO2--C6H4- COO^-） were prepared and characterized by means of elemental analysis, molar conductivity, thermal analysis, IR, UV, and ^1H NMR spectrometries. The cytotoxicity against HCT-8, BGC-823, MCF-7, EJ, and HL-60 cell lines increases in the following sequence： cisplatin 〉 Ⅳ 〉 Ⅴ 〉 Ⅵ 〉 Ⅶ 〉 Ⅰ 〉 Ⅱ 〉 Ⅲ. Moreover, the complexes （ Ⅰ --Ⅻ） display substantially greater activities agaist EJ and HL-60 cell lines than those against the cell lines from other carcinomas. They can induce a concentration-dependent accumulation of HL-60 cells in the G2/M phase of the cell cycle as cisplatin. There is no significant correlation between total DNA platination levels and cytotoxicity of the complexes.
基金supported by the National Natural Science Foundation of China(21073143)“Chunhui Project”from the Ministry of Education of China(Z2009-1-71002,Z2009-1-71006)+2 种基金Graduate Starting Seed Fund of Northwestern Polytechnical University(NPU),China(Z2015152)NPU Foundation for Graduate InnovationChina~~
文摘Cis-diaminedithiocyanatoplatinum(Ⅱ)(cis-[Pt(SCN)2(NH3)2])was prepared and characterized through content analysis of Pt,MS,IR.The results show that the complex has cis configuration and the bond type of Pt and SCN-is Pt-S.When the aqueous solution of the complex was stored for one week,an orange-yellow precipitation appeared,different from the complex with light yellow color.Further comparative studies of these two complexes suggested that the precipitation is cis-[Pt(NCS)2(NH3)2],the linkage isomerism of cis-[Pt(SCN)2(NH3)2].The mechanism of the isomerism reaction is also discussed.
文摘The stability constants of the ternary mixed ligand complexes Pt(Phen)(CA) +(Phen=1,10 Phenanathroline,CA=carboxylate Ligands) were determined by potentiometric pH titration in aqueous solution and in 30～90%(V/V) aqueous ethanal(I=0.1mol·L -1 ,KNO 3;25℃).The difference of stability among the different complexes was compared and discussed,and the percentages of the stacked isomers in the ternary mixed ligand complexes Pt(Phen)(PCA) +(PCA=2 phenylacetate and 3 phenylpropionate) was calculated.The experimental results indicate that the extent of the intramolecular aromatic ring stacking interaction in the ternary mixed ligand Pt(Phen)(PCA) + complexes depends on the polarity of the solution.The weaker the polarity of the solution,the more notable the intramolecular aromatic ring stacking interaction,the larger the percentage of the stacked isomers in the ternary complexes,and the more stable the ternary mixed ligand complexes.
