A preliminary study on a novel free base porphyrin dimer and a zinc prophyrin dimer by comparing their fluorescence properties with those of the corresponding monomers is presented. The fluorescence intensity of the f...A preliminary study on a novel free base porphyrin dimer and a zinc prophyrin dimer by comparing their fluorescence properties with those of the corresponding monomers is presented. The fluorescence intensity of the free base dimer is five times higher than that of the monomer, but the fluorescence intensity of the zinc porphyrin dimer is nearly similar to that of the zinc porphyrin monomer. The emission spectra show that energy transfer occurs between the two units.展开更多
The binding conformations of bidentate ligand DABCO(1,4-diazobicyclo [2,2,2]octane) to a series of p'p type zinc porphyrin dimers covalently linked with flexible alkoxy chain - O(CH2)(n)O- (n=2-10) are described b...The binding conformations of bidentate ligand DABCO(1,4-diazobicyclo [2,2,2]octane) to a series of p'p type zinc porphyrin dimers covalently linked with flexible alkoxy chain - O(CH2)(n)O- (n=2-10) are described by H-1 NMR and UV-vis spectroscopy. DABCO can bind inside the cavities of porphyrin dimers and form a ternary sandwich complex as the alkoxy chain length is long enough. The thermodynamic parameters which control the binding behavior are investigated.展开更多
A new dimeric compound, [Zn（bpdc）（L）]2·4H2O（1, L = 11-fluoro-dipyrido[3,2-a：2＇,3＇-c]phenazine and bpdc = 1,1＇-biphenyl-2,2＇-dicarboxylate）, has been synthesized under hydrothermal conditions and charac...A new dimeric compound, [Zn（bpdc）（L）]2·4H2O（1, L = 11-fluoro-dipyrido[3,2-a：2＇,3＇-c]phenazine and bpdc = 1,1＇-biphenyl-2,2＇-dicarboxylate）, has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 23.671（5）, b = 22.547（5）, c = 13.741（3）A, β = 123.47（3）°, V = 6118（2） A3, Z = 4, C66H44Cl2F2N8O12Zn2, Mr = 1380.73, Dc = 1.499 g/cm3, F（000） = 2816, μ（MoKa） = 0.949 mm-1, R = 0.0572 and wR = 0.1620. In 1, Zn1 and the symmetry formed Zn1 ions are connected by four bridging bidentate carboxylate groups from two independent bpdc anions to yield a binuclear unit with the Zn···Zn separation by bpdc anions of 4.168. Two L ligands are located on both sides of the dimer in chelating bidentate modes. The lateral L ligands from neighboring dimers are paired through strong π-π interactions to result in a fascinating 1D ladder-like supramolecular array. In addition, neighboring supramolecular ladders are packed each other to yield a 3D supramolecular architecture with a 1D channel.展开更多
以二聚脂肪酸为原料,1,4-二氧六环为溶剂,分别与氢氧化钙、氧化锌反应,制备了二聚脂肪酸钙/锌盐(DFA-Ca/DFA-Zn),并采用傅里叶变换红外光谱和电感耦合等离子体发射光谱对其进行了结构表征,发现合成产物为目标产物。以DFA-Ca/DFA-Zn为聚...以二聚脂肪酸为原料,1,4-二氧六环为溶剂,分别与氢氧化钙、氧化锌反应,制备了二聚脂肪酸钙/锌盐(DFA-Ca/DFA-Zn),并采用傅里叶变换红外光谱和电感耦合等离子体发射光谱对其进行了结构表征,发现合成产物为目标产物。以DFA-Ca/DFA-Zn为聚氯乙烯(PVC)/对苯二甲酸二辛酯(DOTP)体系的主热稳定剂,依次向PVC/DOTP体系加入辅助热稳定剂环氧大豆油(ESO)、山梨醇和β-二酮,通过变色法和刚果红法考察了这3种辅助热稳定剂对上述PVC体系初期着色性及长期热稳定性的影响,在此基础上筛选出最佳的DFA-Ca/DFA-Zn复合热稳定剂体系的配方,即DFA-Ca/DFA-Zn/ESO/山梨醇/β-二酮的最佳质量比为1.08/0.27/1/0.5/0.3,在45 g PVC/22.5 g DOTP体系中加入上述配方条件下的复合热稳定剂体系3.15 g时,可使该PVC体系在185℃的静态热稳定时间达195.4 min。展开更多
The formation of coordinated dimeric complexes bridged by axial ligands on surface is observed with the help of a 1,3,5-tris（10-carboxydecyloxy）benzene（TCDB） template through scanning tunneling microscopy（STM）. ...The formation of coordinated dimeric complexes bridged by axial ligands on surface is observed with the help of a 1,3,5-tris（10-carboxydecyloxy）benzene（TCDB） template through scanning tunneling microscopy（STM）. STM images of molecular adlayers of zinc tetraphenylporphyrin（Zn TPP）, zinc phthalocyanine（Zn Pc）, and their mixture are reported. Zn TPP and Zn Pc can spontaneously form highly an ordered structure with a 1：1 molar ratio, which is different from that of individual Zn Pc. The coordinated bimolecular complexes bridged with axial ligands, simply as Zn Pc–DPP–Zn TPP and Zn Pc–DPE–Zn Pc, are presented and the corresponding surface structures are compared. Zn Pc and Zn TPP can be connected by an axial ligand DPP and formed assembled structures out of surface. Two types of arrays with entirely new structure are obtained for the Zn Pc–DPE–Zn Pc complex. These bridged hybrid complexes provide an example of design of self-organized crystals on the basis of coordination through non-covalent interactions.展开更多
基金Supported by the National Natural Science Foundation of China(No. 20071014).
文摘A preliminary study on a novel free base porphyrin dimer and a zinc prophyrin dimer by comparing their fluorescence properties with those of the corresponding monomers is presented. The fluorescence intensity of the free base dimer is five times higher than that of the monomer, but the fluorescence intensity of the zinc porphyrin dimer is nearly similar to that of the zinc porphyrin monomer. The emission spectra show that energy transfer occurs between the two units.
基金the National Natural Science Foundation (29871018) and Tianjin Science and Technology Committee Foundation (983602611) of China
文摘The binding conformations of bidentate ligand DABCO(1,4-diazobicyclo [2,2,2]octane) to a series of p'p type zinc porphyrin dimers covalently linked with flexible alkoxy chain - O(CH2)(n)O- (n=2-10) are described by H-1 NMR and UV-vis spectroscopy. DABCO can bind inside the cavities of porphyrin dimers and form a ternary sandwich complex as the alkoxy chain length is long enough. The thermodynamic parameters which control the binding behavior are investigated.
基金Supported by the Science and Technology Research Projects of the Education Committee of Jilin Province(No.2014150)
文摘A new dimeric compound, [Zn（bpdc）（L）]2·4H2O（1, L = 11-fluoro-dipyrido[3,2-a：2＇,3＇-c]phenazine and bpdc = 1,1＇-biphenyl-2,2＇-dicarboxylate）, has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 23.671（5）, b = 22.547（5）, c = 13.741（3）A, β = 123.47（3）°, V = 6118（2） A3, Z = 4, C66H44Cl2F2N8O12Zn2, Mr = 1380.73, Dc = 1.499 g/cm3, F（000） = 2816, μ（MoKa） = 0.949 mm-1, R = 0.0572 and wR = 0.1620. In 1, Zn1 and the symmetry formed Zn1 ions are connected by four bridging bidentate carboxylate groups from two independent bpdc anions to yield a binuclear unit with the Zn···Zn separation by bpdc anions of 4.168. Two L ligands are located on both sides of the dimer in chelating bidentate modes. The lateral L ligands from neighboring dimers are paired through strong π-π interactions to result in a fascinating 1D ladder-like supramolecular array. In addition, neighboring supramolecular ladders are packed each other to yield a 3D supramolecular architecture with a 1D channel.
文摘以二聚脂肪酸为原料,1,4-二氧六环为溶剂,分别与氢氧化钙、氧化锌反应,制备了二聚脂肪酸钙/锌盐(DFA-Ca/DFA-Zn),并采用傅里叶变换红外光谱和电感耦合等离子体发射光谱对其进行了结构表征,发现合成产物为目标产物。以DFA-Ca/DFA-Zn为聚氯乙烯(PVC)/对苯二甲酸二辛酯(DOTP)体系的主热稳定剂,依次向PVC/DOTP体系加入辅助热稳定剂环氧大豆油(ESO)、山梨醇和β-二酮,通过变色法和刚果红法考察了这3种辅助热稳定剂对上述PVC体系初期着色性及长期热稳定性的影响,在此基础上筛选出最佳的DFA-Ca/DFA-Zn复合热稳定剂体系的配方,即DFA-Ca/DFA-Zn/ESO/山梨醇/β-二酮的最佳质量比为1.08/0.27/1/0.5/0.3,在45 g PVC/22.5 g DOTP体系中加入上述配方条件下的复合热稳定剂体系3.15 g时,可使该PVC体系在185℃的静态热稳定时间达195.4 min。
基金supported by the National Basic Research Program of China (No. 2013CB934200)National Basic Research Program of China (No. 2012CB933001)+1 种基金The Chinese Academy of Sciences (No. YZ201318)the National Natural Science Foundation of China (Nos. 21472029, 51173031, 91127043, 51203030, 51463002)
文摘The formation of coordinated dimeric complexes bridged by axial ligands on surface is observed with the help of a 1,3,5-tris（10-carboxydecyloxy）benzene（TCDB） template through scanning tunneling microscopy（STM）. STM images of molecular adlayers of zinc tetraphenylporphyrin（Zn TPP）, zinc phthalocyanine（Zn Pc）, and their mixture are reported. Zn TPP and Zn Pc can spontaneously form highly an ordered structure with a 1：1 molar ratio, which is different from that of individual Zn Pc. The coordinated bimolecular complexes bridged with axial ligands, simply as Zn Pc–DPP–Zn TPP and Zn Pc–DPE–Zn Pc, are presented and the corresponding surface structures are compared. Zn Pc and Zn TPP can be connected by an axial ligand DPP and formed assembled structures out of surface. Two types of arrays with entirely new structure are obtained for the Zn Pc–DPE–Zn Pc complex. These bridged hybrid complexes provide an example of design of self-organized crystals on the basis of coordination through non-covalent interactions.
