羟基卟啉衍生物的电喷雾多级串联质谱研究

研究了3种单羟基卟啉的电喷雾多级串联质谱，对其可能的裂解途径进行了归纳；结果表明，仅仅在苯环上无取代基的卟啉HPTPP中才能观察到失去活性的羟基或羟苯基的裂解碎片，苯环具有拉电子取代基的卟啉比具有推电子取代基的卟啉更容易裂解；由此可见，苯环上取代基性质对羟基卟啉的裂解方式有一定的影响。     

高效液相色谱法在卟啉分析中的应用

卟啉是一组环状四吡咯化合物(图1),环周围的八个取代位置带有各种不同的基团。这些取代基的相对位置不同将形成多种异构体。典型的卟啉化合物结构列于表1。     

双亲性稠环双卟啉的合成和自组装研究

在稠环双卟啉分子两侧的卟啉环上分别连接亲水和疏水性取代基,合成双亲性稠环双卟啉分子。利用紫外-可见光谱和核磁氢谱考察了它们在不同溶剂中的溶解行为。结果表明,当双卟啉环两侧取代基的亲疏水性差异足够大时,在亲水性溶剂中,两侧取代基溶解性的差异所提供的附加亲疏水作用,可以引导稠环双卟啉分子通过π-π堆积作用形成H-聚集体。这种自组装形成的一维柱状超分子聚集体,在分子光电器件等领域具有潜在的应用前景。     

亚卟啉的研究进展

自2006年亚卟啉首次成功合成以来,其研究逐渐引起了化学家们的重视。随着新的合成方法的出现,含有不同取代基的亚卟啉不断被合成出来。最近报道的通过扩展卟啉的裂解反应制备亚卟啉的方法不但反应新奇,而且效率较高。通过系统的研究发现,亚卟啉是碗状的分子,具有14π的共轭大环结构。亚卟啉与普通卟啉有着许多不一样的性质,如在更高的能量上有紫外可见吸收,有强的荧光效应,而且有较强的meso位取代基效应等等。四轨道模型、理论计算以及单晶结构能够很好地解释亚卟啉与卟啉的这些性质差异。通过偶联反应, meso位苯基的对位取代基为胺基、寡聚的苯基炔基或树突状的咔唑臂的特殊亚卟啉化合物被成功合成。性质测试表明,由于meso位的取代基效应,这些修饰过的亚卟啉在双光子吸收,荧光效应,能量转移等方面具有优异的性能,在电子学、光学上有着潜在的应用前景。     

铁卟啉化合物的合成及其催化环己烷羟基化反应的研究

合成了15种卟啉环上具有不同取代基和纵轴上具有不同配位基的TRPPFe^ⅢCl和TPPFe^ⅢX, 从反应速率、反应产率和产物选择性等方面考察了卟啉环上取代基R和纵轴配位基X对这些铁卟啉在温和条件下催化环己烷羟基化反应催化性能的影响,还研究了反应溶剂、反应温度以及有机碱等环境因素对铁卟啉催化性能的影响,获得了一些新的结果和规律。     

对位取代的四苯基卟啉衍生单酸的合成及有关的结构理论

报导了对位取代的四苯基卟啉衍生单酸的合成及表征，阐述了一些有关共轭卟啉平面环体系的结构理论。     

不对称卟啉化合物的合成及其与氨基酸甲酯的作用

本文合成了含有单取代酰胺基的不对称卟啉及其锌(Ⅱ)络合物Zn(m,2-CNTPP)及Zn(m,3-CNTPP).对三氯甲烷溶液中它们与谷氨酸二甲酯、亮氨酸甲酯以及苯丙氨酸甲酯的作用进行了系统的研究,讨论了卟啉化合物对氨基酸甲酯分子的结合能力、结合方式,以及二者之间的多种存在形式。结果表明,锌卟啉与氨基酸甲酯以1:1的化学计量结合,中心金属锌(Ⅱ)离子和氨基酸甲酯中的氨基配位,卟啉环上的取代基与氨基酸甲酯中的残基可形成氢键、范德华力等弱相互作用。在卟啉和氨基酸甲酯的作用中,氨基与金属离子直接配位,α-碳上的质子靠近卟啉环平面,而酯基中的甲氧基处于远离卟啉环平面的位置。     

氯代苯基卟啉-5-氟尿嘧啶化合物的光谱研究

合成了12种新型卟啉－5－氟尿嘧啶化合物,通过核磁共振谱,质谱,红外光谱,紫外光谱,荧光光谱及元素分析确定了其结构,并讨论了和总结了12种化合物光谱的关系特征及其规律,确定配体与5－氟尿嘧啶相连点是N1－H还是N2－H的判据。卟啉环上苯的1HNMR峰形受取代基氯原子位置影响较大,且化学位移向低场移动,不受卟啉链长短的影响。12种化合物的荧光强度都遵循双取代化合物高于单取代化合物的规律。     

铜卟啉-TiO_2复合光催化剂制备及降解4-NP的研究

合成了取代基数目不同的3种铜卟啉配合物,并与纯锐钛矿型TiO2作用,得到相应的铜卟啉敏化TiO2复合光催化剂.采用扫描电子显微镜(SEM)考察了铜卟啉-TiO2复合光催化剂的形貌特征,紫外-可见光谱和X射线衍射(XRD)分析结果表明,铜卟啉负载于TiO2表面,未改变TiO2的晶型.可见光降解4-硝基苯酚(4-NP)实验结果表明,复合催化剂性质稳定,可多次重复使用,卟啉环外围极性取代基数目越多,铜卟啉光敏化效果越好.     

TTP-钴构型的测定和meso-四(3,4-次甲二氧基苯基)卟啉的合成及其与镉的显色反应

本文对TTP-钴的构型进行了测定,证明其中位的4个苯环与卟啉环不在同一平面上,二者已不能发生共轭效应,所以取代基对卟啉环的影响较小,用改变取代基来提高试剂的灵敏度效果必然不大,本文合成了新型卟啉——meso-四(3,4-次甲二氧基苯基)卟啉(简称TMDOPP),并对其与镉显色反应分光光度法进行了研究,结果表明,此法灵敏度高(ε=4.9×     

5-氟尿嘧啶卟啉化合物的合成和光谱性质

首次合成并用元素分析、红外光谱、核磁和质谱等表征了6种新的5 氟尿嘧啶卟啉化合物. 对其紫外吸收、荧光性质和荧光寿命进行了研究,并与未修饰卟啉化合物光谱性质进行了比较. 5 氟尿嘧啶卟啉化合物荧光寿命为7 ns,受环境取代基和溶剂的影响较小.     

反丁烯二酰基桥连的带不同取代基的卟啉二联体的合成与性质

合成了反丁烯二酰基桥连的3种带不同取代基的卟啉二联体, 通过红外光谱, 紫外-可见光谱, 核磁共振波谱和质谱对化合物的结构进行了确认, 并研究了二联体的表面光电压谱, 荧光光谱和激光拉曼光谱的变化. 结果表明, 取代基的类型对卟啉二联体分子的荧光量子产率有显著影响, 带供电子基团的甲氧基增强了荧光量子产率, 而带吸电子基团的氯则降低了荧光量子产率, 并且吸电子基团的氯比供电子基团的甲氧基对荧光的影响更大. 取代基的电子效应对卟啉二联体的荧光性和激光拉曼光谱有较大影响.     

Synthesis and different substituent effects on spectral and electrochemical properties of porphyrin nicotinic acid binary compounds

The porphyrin nicotinic acid binary compounds with different substituents in porphine rings (5-(4-nicotinicoxyldecyloxy)phenyl-10,15,20-triphenylporhyrin 2a, 5-(4-nicotinicoxyldecyloxy)phenyl-10,15,20-tri(4-chlorophenyl)porphyrin 2b and 5-(4-nicotinicoxyldecyloxy)phenyl-10,15,20-tri(4-methoxyphenyl)porphyrin 2c) were synthesized. All of them have been characterized, assigned and analyzed by UV–vis, IR, MS and ¹H NMR spectra. Their electrochemical and spectroscopic properties were studied by using cyclic voltammetry, fluorescence spectra and Resonance Raman spectra. Different substituents have a little influence on electrochemical behavior and fluorescence spectra. In the Resonance Raman spectra, the substituent has little influence on the skeleton vibration of porphyrin and has much influence on the vibration of phenyl.     

Synthesis of Metal Porphyrins Tailed with Salicylic Acid and their Interaction with Bovine Serum Albumin

A synthetic method of porphyrins tailed with salicylic substituents is described.Reaction of bromoalkoxyphenyl porphyrin 1 with salicylic acid gave porphyrins 2-5. These new compounds were confirmed by ^1H NMR, IR, UV-vis, MS and elemental analysis, and observed their interaction with bovine serum albumin (BSA) in fluorescence spectrum.     

羟基卟啉化合物的电化学、顺磁共振及时间分辨光电压性质

通过循环伏安法、电子顺磁共振谱和时间分辨电压光谱研究了羟基取代基数目和位置的不同对羟基苯基卟啉化合物的电化学、电子顺磁共振和时间分辨光电压性质的影响. 研究结果表明, 所有氧化还原反应都是在卟啉环上进行的. 卟啉周边取代基数目的增加使得卟啉共轭体系平均电子云密度增大, 导致体系易氧化而难以还原. 对称性增强可能使卟啉化合物的半波电位值向正方向移动, 羟基取代基的给电子效应对于卟啉化合物电化学性质的影响起主导作用. 常态下卟啉分子没有EPR信号, 在光的激发下, 卟啉分子由原来的逆磁性分子变成顺磁性的激发三重态分子, 这种激发三重态分子在分子轨道上具有两个未成对电子, 这两个电子相距很近, 彼此之间发生很强的相互作用而产生电子, 它的g值随卟啉共轭体系平均电子云密度增大而变大. 时间分辨光电压是由分子中的自由光声载流子的存在而产生的, 光电压的衰减与分子结构密切相关, 它们的电荷分离速度基本上随卟啉周边羟基取代基数目的增加而减慢.     

Electronic and steric effects of substituents on the coordinating properties of porphyrins

Kinetics of the formation of zinc complexes of porphyrin with various substituents was studied in acetic acid and pyridine. The introduction of strong electron-withdrawing substituents (nitro groups) to the meso-positions of the porphyrin macrocycle was shown to change the reaction rate by an order of magnitude or less compared to the phenyl-substituted analogs. However, the introduction of a large number of bulky substituents leads to the deformation of the porphyrin ligand and thus affects much stronger the coordination properties of porphyrins, decreasing or increasing the rate of the complexation reaction by several orders of magnitude.     

Effect of terminal substituents on self‐assembly behavior of porphyrin molecules on Ag(110)

Effect of terminal substituents on self‐assembly behavior of porphyrin molecules has been studied with three derivatives modified with distinctly different substituents, 5,15‐(di‐3,5‐di‐tert‐butylphenyl) porphyrin, 5,15‐(dimesityl) porphyrin, and 5,15‐(di‐4‐ethynylphenyl) porphyrin. Scanning tunneling microscopy and density functional calculations reveal that 5,15‐(di‐3,5‐di‐tert‐butylphenyl) porphyrin, 5,15‐(dimesityl) porphyrin, and 5,15‐(di‐4‐ethynylphenyl) porphyrin spontaneously give different ordered structures on Ag(110) surface both at room temperature and after annealing. It is clear that the tert‐butylphenyl substituent could increase the intermolecular van der Waals interactions to form stable network structure under condition of thermal activation, whereas the mesityl substituent plays an essential role in the formation of rigid chain structure as a result of the CH–π interactions between the mesityl groups of molecule enantiomers. Moreover, the ethynylphenyl substituent could induce metal atoms to coordinate with ethynyl to form organometallic chains. Copyright © 2016 John Wiley & Sons, Ltd.     

水杨酸键联卟啉的合成及与牛血清白蛋白的相互作用

以溴代烷氧基苯基卟啉(1)为原料与水杨酸作用,分别得到了化合物2和3,再与醋酸钴反应,得到了钴卟啉配合物4和5.新化合物分别由¹HNMR,IR,UV-Vis,MS和元素分析确证.同时,利用荧光光谱考察了金属卟啉与牛血清白蛋白的相互作用.     

ABC–ABC-Type Directly meso–meso Linked Porphyrin Dimers

Covalently linked porphyrin oligomers are attractive because of their extended π-conjugated systems. Among various porphyrin oligomers, directly meso–meso linked porphyrin oligomers exhibit unique photophysical properties due to their strong exciton couplings derived from the alternative orthogonal geometry of the porphyrins. Although their structural and electronic properties can be greatly altered by substituents at meso positions, it is still difficult to introduce different substituents at the meso positions. Thus, it is a challenge to develop general synthetic methodologies for functional porphyrin dimers and oligomers with different substituents at the meso positions. Herein, a general synthetic strategy for ABC–ABC-type directly meso–meso linked porphyrin dimers by stepwise functionalization starting from 10,15,20-meso-free 5-substituted porphyrin as building block is established. A meso-ABC–ABC-type meso–meso-linked donor–π-acceptor-type porphyrin dimer was prepared and exhibited the highest power conversion efficiency (7.91 %) ever reported for dye-sensitized solar cells based on dimeric orthogonal donor–π-acceptor-type organic sensitizers. This synthetic strategy will provide useful guidance for the rational design of functional porphyrin dimers and oligomers for diverse applications.     

Superbenzene–Porphyrin Conjugates

A free‐base porphyrin carrying two hexabenzocoronene (HBC) substituents in a trans arrangement and its zinc complex have been prepared. The compounds were characterized extensively and found to form tricationic dimers in the gas phase. X‐ray crystallography confirms for the zinc complex a profound π‐stacking of the HBC moieties. In contrast, the free‐base porphyrin incarcerates n‐heptane which essentially prevents π‐stacking. Upon excitation of the HBC substituents, efficient energy transfer to the central porphyrin is observed.