单核铁（Ⅱ）双卟啉配合物在溶液中的构象平衡及其对环己烷 …

合成及表征了一系列以柔韧碳氢链相连不同长度的ｐ／ｐ型单核铁双卟啉配合物，以可见光谱首镒观察到该系列配合物在氯仿溶液中开放式及闭合式构象的平衡。发现６８０ｎｍ处吸收峰强度与这种构象平衡有关，烷氧链越长，该吸收峰强度越大，利用该类配合物模拟了细胞色素Ｐ４５０单加氧酶对环己烷的羟化作用，催化结果表明，在以分子氧为氧源及还原剂存在的温和     

单核铁(Ⅲ)双卟啉配合物在溶液中的构象平衡及其对环己烷羟化反应的催化活性的影响

合成及表征了一系列以柔韧碳氢链相连不同长度的ｐ／ｐ型单核铁（Ⅲ）双卟啉配合物，以可见光谱首次观察到该系列配合物在氯仿溶液中开放式及闭合式构象的平衡，发现６８０ｎｍ处吸收峰强度与这种构象平衡有关，烷氧链越长，该吸收峰强度越大．利用该类配合物模拟了细胞色素Ｐ４５０单加氧酶对环己烷的羟化作用，催化结果表明，在以分子氧为氧源及还原剂存在的温和条件下，该类配合物的催化活性显著高于单核铁卟啉（ＦｅＴＰＰＣｌ），随着柔韧碳氢链长度的增加，双卟啉的催化活性依次增加．高的催化活性与双卟啉配合物在溶液中的构象平衡，即闭合式构象引起的立体位阻及电子转移有关．     

双卟啉化合物的构象平衡及π-π作用研究

制备并表征了一系列以柔韧烷氧化相连的自由双卟啉及其锌配合物,以＾１Ｈ－ＮＭＲ考察了烷氧链长度及锌离子对双卟啉构象平衡的影响。结果表明,双卟啉存在开放式及闭合式构象平衡,随烷氧链的增长,构象平衡由开放式向闭合式移动,当链上碳原子数为４时最有利于双卟啉形成闭合式构象。     

新型氨基酸尾式卟啉及莫锌配合物的合成与表征

金属卟啉配合物作为主体分子对氨基酸酯及其衍生物的分子识别研究是当今卟啉仿生化学的重要课题[1～6].这一领域的研究成果在生物传感器的研制,癌症的诊断和治疗,模拟含卟啉生物大分子的功能以及在生物大分子构象和类型的识别研究中具有潜在的应用价值[7].     

氨基酸卟啉锌配合物对氨基酸酯的分子识别研究(英文)

用紫外可见吸收光谱滴定方法研究了一种新型的苏氨酸卟啉锌配合物(主体)对氨基酸酯(客体)的分子识别.这种锌卟啉可以与氨基酸酯形成 1:1和 1:2的两种加合物.氨基酸酯的氨基首先与氨基酸残基的羧基作用形成 1:1的加合物,然后与锌卟啉的中央锌原子配位形成 1:2的加合物,客体分子与主体分子上的氨基酸残基之间的排斥作用以及主客体之间的色散力作用是主体分子能识别客体分子的另外两种作用。     

氨基酸卟啉锌配合物对氨基酸酯的分子识别

本文用紫外－可见吸收光谱滴定方法研究了一种新型的苏氨酸卟啉锌配合物（主体分子）对氨基酸酯（客体分子）的分子识别，这种锌卟啉可以与氨基酸酯形成1:1和1：2的两种加合物，客体分子的氨基首先与主体分子上氨基酸残基的羧基作用形成1：1的加合物，然后另一客体分子的氨基与锌卟啉的中央锌原子配位形成1：2的加合物，客体分子与主体分子上的氨基酸残基之间的库仑力作用以及主－客体之间的色散力作用可能是主体分子能识别客体分子的另外两种相互作用。     

手性苏氨酸卟啉锌配合物的圆二色谱

作为重要的生物配体和强生色团 ,卟啉化合物已经用于血红蛋白模型 [1]、电子转移功能 [2]和分子识别及催化研究 [3,4]等仿生化学研究 .如何应用多肽的二级结构合成具有高效生物活性的仿生化合物是在这些研究领域中进一步发展的关键 .圆二色谱（ Circular Dichroism, CD光谱 )已经广泛用于研究手性化合物的结构 .在生物体中,血红蛋白、肌红蛋白、细胞色素 c和 chlorophyll聚集体等在 Soret区表现出圆二色性,在这些生物分子中,蛋白链是与卟啉单元相连的 .虽然卟啉在 Soret区有强的电子吸收谱带,但是卟啉单元在 Soret区并不表现出圆二…     

四种新型单取代氨基酸四苯基卟啉锌配合物的合成和光谱表征

本文合成了四种新的单取代氨基酸四苯基卟啉锌配合物Zn［Val-TPP］、Zn［Glu-TPP］、Zn［Tyr-TPP］和Zn［Trp-TPP］。通过化学分析和元素分析确定了配合物的组成，研究了它们的紫外、红外、荧光和激光拉曼光谱。     

新型不对称卟啉配体及其锌配合物的合成与荧光性能

以3,5-二羟基苯甲酸丙酯和5-(4-硝基)苯基-10,15,20-三苯基卟啉为起始原料,合成了新型的不对称卟啉配体——5-[4-(3,5-二-十六烷氧基苯甲酰亚胺基)苯基]-10,15,20-三苯基卟啉(1)及其锌配合物(2),其结构经UV-Vis,1H NMR,IR和元素分析表征。用荧光激发光谱研究了1和2的荧光性能,结果表明:在激发波长为420 nm时,1和2的荧光发射峰分别在650 nm,709 nm和600 nm,644 nm。     

单核铁配合物与过氧酸反应的研究

本文用波谱及高压液相色谱（ＨＰＬＣ）方法研究了二氯代三－２－吡啶甲基胺的铁（Ⅲ）配合物（ＦｅＴＰＡＣｌ＿２ＣｌＯ＿４），三─６─甲基─２─吡啶甲基胺合铁（Ⅱ）与苯甲酸的配合物（Ｆｅ（Ⅱ）ＴＬＡＯＢｚＣｌＯ＿４）同单过氧化邻苯二甲酸六水合镁盐（ｍｏｎｏｐｅｒｏｘｙｐｈｔｈａｌｉｃａｃｉｄ，ｍａｇｎｅｓｉｕｍｓａｌｔｈｅｘａｈｙｄｒａｔｅ，即ＭＰＰＡ）的反应。提出了过氧键的两种断裂（即均裂和异裂）机理，分析了中心离子价态、配体结构等因素对反应机理的影响；并通过ＦｅＴＰＡＣｌ＿２ＣｌＯ＿４与间氯代过氧代苯甲酸（ｍｃＰＢＡ）的反应，研究了过氧酸结构对反应机理的影响。实验结果表明：就过氧酸中过氧键发生均裂的程度而言：三价铁配合物与过氧酸的反应＞二价铁配合物与过氧酸的反应；ＭＰＰＡ反应体系＞ＭＣＰＢＡ反应体系。     

Conformation Analysis and Thermodynamics of Binding Behavior of DABCO to p/p type Dimeric Porphyrin Hosts

Covalently linked metalloporphyrin dimers have attracted considerably interest among chemists as models for metalloenzymes, which derive from their remarkable electron, energy transfer and special conformation properties1,2. Metalloporphyrins with large cavities have been designed and assembled with the idea of creating multisite complexing hosts incorporating functionalized subunits for binding organic substrates and transition metals so as to mimic metalloenzymes, as well as supermolecular ph…     

单面桥联手性金属卟啉的合成、构象分析及不对称催化氧化性能

合成并表征了新型单面桥连手性卟啉(1a)及其铁配合物(1b), 利用分子力学方法和1H NMR对手性卟啉的空间构象及手性空腔特征进行了分析. 将化合物1b用于苯乙烯衍生物的催化环氧化反应, 结果表明, 轴向配体的存在使化合物1b获得了较高的对映选择性(e.e.为73%-80％), 反应产率及速率也有大幅度提高, 4-叔丁基吡啶的效果最好. 催化体系中轴向配体控制了反应底物向化合物1b手性空腔的定向趋近, 从而有效地提高了手性催化性能.     

Fusing Porphyrins and Phospholes: Synthesis and Analysis of a Phosphorus‐Containing Porphyrin

A phosphole‐fused porphyrin dimer, as a representative of a new class of porphyrins with a phosphorus atom, was synthesized for the first time. The porphyrin dimer exhibits remarkably broadened absorption, indicating effective π‐conjugation over the two porphyrins through the phosphole moiety. The porphyrin dimer possesses excellent electron‐accepting character, which is comparable to that of a representative electron‐accepting material, [60]PCBM. These results provide access to a new class of phosphorus‐containing porphyrins with unique optoelectronic properties.     

系列巯基苯基卟啉自组装膜的光谱和电化学性质

考察了系列巯基苯基卟啉自组装膜的光谱及电化学特征。 结果表明,与溶液中巯基苯基卟啉的光谱相比,自组装膜中卟啉分子的吸收和荧光光谱均发生了明显变化,随着卟啉分子中巯基数目的增加,其荧光峰依次发生红移;不同巯基苯基卟啉自组装膜修饰电极对电解液中电对的电子转移阻碍能力不同,由5,10-二[4-(3-巯基丙氧基)-苯基]-15,20二苯基卟啉形成的卟啉自组装膜的阻碍作用最强,膜表面覆盖度最致密。     

手性锌卟啉的非线性光学性质及对咪唑类客体分子识别的构象研究

在纳秒(ns)领域中，利用Z-扫描技术测定了Zn(o-BocTyr)TAPP(主体1)和Zn(p-BocTyr)TAPP(主体2)两种手性锌卟啉的三阶非线性光学性质以及对咪唑类客体的分子识别行为的构象研究. 结果表明，(1) 两种手性锌卟啉都具有反饱和吸收效应和自散焦效应；(2) 由于两种主体中侧链位置的差异，造成两种主体分子极化程度的不同，主体1具有较大的三阶非线性折射率(n2)值；(3) 主体1中侧链苯环与卟啉环之间存在一定的相互作用；(4) 分子识别出现了配位方向的选择性，客体咪唑(Im)与主体1侧链中的苯环能够形成π-π相互作用，选择从有侧链一方配位于主体1，而2-甲基咪唑(2-MeIm)选择从没有侧链一方进攻主体1，但对于主体2，则没有出现配位方向的选择性.     

Studies Related to Norway Spruce Galactoglucomannans: Chemical Synthesis,Conformation Analysis,NMR Spectroscopic Characterization,and Molecular Recognition of Model Compounds

Galactoglucomannan (GGM) is a polysaccharide mainly consisting of mannose, glucose, and galactose. GGM is the most abundant hemicellulose in the Norway spruce (Picea abies), but is also found in the cell wall of flax seeds, tobacco plants, and kiwifruit. Although several applications for GGM polysaccharides have been developed in pulp and paper manufacturing and the food and medical industries, attempts to synthesize and study distinct fragments of this polysaccharide have not been reported previously. Herein, the synthesis of one of the core trisaccharide units of GGM together with a less‐abundant tetrasaccharide fragment is described. In addition, detailed NMR spectroscopic characterization of the model compounds, comparison of the spectral data with natural GGM, investigation of the acetyl‐group migration phenomena that takes place in the polysaccharide by using small model compounds, and a binding study between the tetrasaccharide model fragment and a galactose‐binding protein (the toxin viscumin) are reported.     

卟啉及其衍生物对生物分子的识别研究进展

卟啉及其衍生物作为主体分子对生物分子的识别具有独特的优点：分子结构多样、形状选择、稳定性好和敏感性高等。 本文着重介绍了国内外关于卟啉对DNA、氨基酸、醌和胺等的分子识别研究进展。     

Theoretical Investigation on the Second-order Nonlinear Optical Properties of Chiral Amino Acid Zinc(Ⅱ) Porphyrins

Static second-order nonlinear optical effects of amino acid zinc(II) porphyrins 1, 2, 3 and 4 were calculated by the TDHF/PM3 method based on the molecular structures optimized at the semiempirical PM3 quantum chemistry level, showing due to the cancellation of symmetric center, these amino acid zinc(II) porphyrins exhibit second order nonlinear optical response. The analysis of β components indicated that these amino acid zinc(II) porphyrins are of multipolarizabilities, and they may be ascribed as the "mixture" of octupolar and dipoar molecules with ||βJ=3||/||βJ=1|| ≈ 5. It is found that there are no significant differences between the static β values of non-chiral and chiral amino acid zinc(II) porphyrins. However, the βxyz component, which is quite important to quadratic macroscopic х (2) susceptibility of chiral material, is increased significantly with the increase of side chain group of amino acids.     

Force field development for organic molecules: Modifying dihedral and 1–n pair interaction parameters

We comprehensively illustrate a general process of fitting all‐atom molecular mechanics force field (FF) parameters based on quantum mechanical calculations and experimental thermodynamic data. For common organic molecules with free dihedral rotations, this FF format is comprised of the usual bond stretching, angle bending, proper and improper dihedral rotation, and 1–4 scaling pair interactions. An extra format of 1–n scaling pair interaction is introduced when a specific intramolecular rotation is strongly hindered. We detail how the preferred order of fitting all intramolecular FF parameters can be determined by systematically generating characteristic configurations. The intermolecular Van der Waals parameters are initially taken from the literature data but adjusted to obtain a better agreement between the molecular dynamics (MD) simulation results and the experimental observations if necessary. By randomly choosing the molecular configurations from MD simulation and comparing their energies computed from FF parameters and quantum mechanics, the FF parameters can be verified self‐consistently. Using an example of a platform chemical 3‐hydroxypropionic acid, we detail the comparison between the new fitting parameters and the existing FF parameters. In particular, the introduced systematic approach has been applied to obtain the dihedral angle potential and 1–n scaling pair interaction parameters for 48 organic molecules with different functionality. We suggest that this procedure might be used to obtain better dihedral and 1–n interaction potentials when they are not available in the current widely used FF. © 2014 Wiley Periodicals, Inc.     

Control of Conformation and Chirality of Nonplanar π‐Conjugated Diporphyrins Using Substituents and Axial Ligands

Nonplanar conformations of pyrazine‐fused Zn^II diporphyrins could be controlled by the choice of the meso‐aryl substituents and an axial ligand on the central metals. Zn^II diporphyrins bearing sterically demanding meso‐aryl groups with ortho‐substituents led to a twisted chiral D₂ conformation, while an achiral C_2h form was preferred in the case of aryl groups without ortho‐substituents. Helical chirality induction on Zn^II diporphyrins in the twisted conformation was achieved by controlling their handedness of the molecular twist through coordination of optically active 1‐phenethylamine.