A Dual Read-out Molecularly Imprinted Composite Membrane Sensor Based on Zinc Porphyrin for the Detection of Dimethyl Methylphosphonate

Molecularly imprinted membrane-zinc porphyrin-mathacrylate(MIM-Zn-MAA), a dual read-out sensor based on a molecularly imprinted membrane, was developed to recognize and detect dimethyl methylphosphonate (DMMP) as an intermediate molecule of organophosphorus pesticides. The membranes were prepared via thermal polymerization of two functional monomers(zinc porphyrin and mathacrylate) on the surface of a glass slide functionalized with ethylene glycol dimethacrylate and azobisisobutyronitrile. The morphology of the as-synthesized MIM-Zn-MAA was determined with scanning electronic microscopy. The composite membranes exhibited macrovoid morphologies, which were affected by the functional monomers. These membranes were selectively adsorbed onto the template molecule and displayed higher adsorbing capacity toward DMMP compared with their structural analogs. Changes in the fluorescent spectra were qualitatively and quantitatively monitored via fluorescence photometry. Difference maps were also obtained using colorimetry before and after the reaction between MIM-Zn-MAA and DMMP at various concentrations. The maps showed a wide linear range varying from 0.1 μmol/L to 10 mmol/L with a low detection limit of 0.1 μmol/L. These preliminary results demonstrate that the as-fabricated dual read-out sensor displays good sensitivity and selectivity toward DMMP, indicating its considerable potential in DMMP detection in practical applications.     

Spectroscopic Investigations of Porphyrin-TiO2 Nanoparticles Complexes

This study presents the spectral characterization of TiO₂ nanoparticles (NPs) functionalized with three porphyrin derivatives: 5,10,15,20-(Tetra-4-aminophenyl) porphyrin (TAPP), 5,10,15,20-(Tetra-4-methoxyphenyl) porphyrin (TMPP), and 5,10,15,20-(Tetra-4-carboxyphenyl) porphyrin (TCPP). UV-Vis absorption and Fourier transform infrared spectroscopy–attenuated total reflection (FTIR-ATR) spectroscopic studies of these porphyrins and their complexes with TiO₂ NPs were performed. In addition, the efficiency of singlet oxygen generation, the key species in photodynamic therapy, was investigated. UV-Vis absorption spectra of the NPs complexes showed the characteristic bands of porphyrins. These allowed us to determine the loaded porphyrins on TiO₂ NPs functionalized with porphyrins. FTIR-ATR revealed the formation of porphyrin-TiO₂ complexes, suggesting that porphyrin adsorption on TiO₂ may involve the pyrroles in the porphyrin ring, or the radicals of the porphyrin derivative. The quantum yield for singlet oxygen generation by the studied porphyrin complexes with TiO₂ was higher compared to bare porphyrins for TAPP and TMPP, while for the TCPP-TiO₂ NPs complex, a decrease was observed, but still maintained a good efficiency. The TiO₂ NPs conjugates can be promising candidates to be tested in photodynamic therapy in vitro assays.     

胆紫素的形成和八乙基卟啉的光氧化

本文利用八乙基卟啉镁络合物, 光氧化后, 经过简单的处理, 生成锌络合物,再经硝酸银处理后, 即得到胆紫素。     

meso-四(4-N-甲基吡啶基)卟啉-金属-氧簇超分子化合物的光谱及电催化氧还原行为研究

采用紫外可见吸收光谱研究了meso -四 ( 4 -N -甲基吡啶基 )卟啉 (M1 TMPyP ,M1 =H2 ,Zn)阳离子与金属-氧簇阴离子 (SiW1 2 O40 4 - )在水溶液中的光谱行为 .光谱演变及Job′s图表明M1 TMPyP与SiW1 2 O40 4 - 在水溶液中可形成相对稳定的 1∶1的超分子化合物。溶液的紫外可见吸收谱图明显不同于未相互作用的反应物吸收谱图的加和 ,表明有新化合物生成 ,且卟啉的发色团与SiW1 2 O40 4 - 通过静电发生强相互作用 ,同时考察了化学计量为1∶1的 [CoTMPyP][SiW1 2 O40 ]超分子化合物的电催化氧还原活性及其稳定性 ,表明该类超分子化合物有望成为新一类的催化氧还原的修饰电极材料。     

金属卟啉分子印迹聚合物的合成与性能研究

以5-(4-羟基苯基)-10,15,20-三苯基卟啉锌为印迹分子,4-乙烯基吡啶为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成了具有金属卟啉识别能力的分子印迹聚合物.紫外可见滴定光谱研究表明,功能单体与印迹分子在聚合前形成1:1的配合物.通过吸附试验、荧光光谱及斯卡查特分析法,考察了分子印迹聚合物对锌卟啉化合物的识别性能.结果表明,印迹聚合物对结构类似的卟啉化合物具有良好的识别能力,对印迹分子荧光性能的影响远大于其对应的非印迹聚合物.在浓度较低时,印迹聚合物对印迹分子的结合常数和最大结合量分别为:1.61×106L/mol和3.22×10-5mol/g.     

A Doubly Zwitterionic Antiaromatic [28]Hexaphyrin Formed upon Deprotonation of 5,20‐Di(N‐methyl‐4‐pyridinium)‐Substituted [28]Hexaphyrin

A rectangular 5,20‐di(4‐pyridyl) [26]hexaphyrin was reduced with NaBH₄ to give the corresponding twisted Möbius aromatic [28]hexaphyrin. Subsequent double N‐methylation gave a dicationic 5,20‐di(N‐methyl‐4‐pyridinium) [28]hexaphyrin, which was converted to a doubly zwitterionic and Hückel antiaromatic [28]hexaphyrin upon deprotonation with sodium methoxide.     

Characterization and Crystal Structure of a New Holmium(III) Complex with the Macrocyclic Ligand Derived from 2,6-Diformyl-4-methylphenol and Diethylenetriamine

The title compound (13,27-dimethyl-3,6,9,17,20,23-hexaazatricyclo-[23.3.1.111,15]- triaconta-1(29),2,9,11,13,15(30),16,23,25,27-decaene-29,30-diol-N3,N6,N9,O29,O30)-bis(nitrato-O,O′)- holmium(III) nitrate hydrate has been prepared and characterized by elemental analysis, infrared spectra, and electrospray mass spectra. Its crystal and molecular structures were determined by X-ray diffraction methods. The crystal crystallizes in the monoclinic system, space group C2/c with a = 23.737(12), b = 14.237(7), c = 19.801(10) , β = 91.36(1)o, Mr = 831.57, V = 6690(6) 3, Z = 8, Dc = 1.651 g/cm3, F(000) = 3344, R = 0.0482 and wR = 0.0923. The holmium ion is located in one of the compartments of the macrocyclic ligand and presents a distorted tricapped trigonal prismatic coordination geometry. The macrocycle is coordinated with two oxygen and three nitrogen atoms. Two nitrates are chelated in the opposite positions of the macrocycle, and the third one is ionic.     

5，10，15，20-四(2-甲氧基苯基)卟啉合钴的晶体和分子结构

用X-射线测定了5，10，15，20-四(2-甲氧基苯基)卟啉合钴［TMOPCo(Ⅱ)］的晶体结构，实验表明，晶体属正交晶系，空间群Pbca, a=11.544(2), b=14.294(2), c=23.984(2)?，V=3957?³,Z=4, d_c=1.329 g/cm³, μ(CuKα)=39.45 cm^-1, <     

乙酰丙酮－5，10，15，20－四－（对戊氧基苯基）卟啉及镱配合物的合成与表征

乙酰丙酮－５，１０，１５，２０－四－（对戊氧基苯基）卟啉及镱配合物的合成与表征李冬梅，刘国发，师同顺，林闽，刘玉文，邹明珠，曹锡章，刘晓勋（吉林大学化学系，长春，１３００２３）（吉林大学分析测试中心）关键词乙酰丙酮，四－（对戊氧基苯基）卟啉，镱的配合...     

Properties of meso-tetrakis (4-n-alkanoyloxyphenyl) porphyrin liquid crystal Co and Ni complexes

Six series of meso-tetrakis (4-n-alkanoyloxyphenyl) porphyrin Co and Ni complexes (12 kinds) were reported. Nine of the compounds were found to exhibit liquid crystal properties and display a hexago-nal columnar discotic columnar (Colh) phase. Molecular structure of all synthesized compounds was confirmed by IR, UV, MS, 1H NMR, and elemental analysis. These liquid crystalline compounds have been studied by cyclic voltammetry, luminescence, and surface photovoltage spectroscopy.