已经合成了具有甘脲骨架的半刚性双卟啉分子夹。该夹子为二胺的结合提供了适应性的分子腔。10 4 –10 7 M -1的二胺的结合常数比10 3 M -1的单胺的结合常数高几个数量级。,表示优先选择双齿绑定。NMR研究证实,在片段内部发生了双齿宾客的结合。短和中等大小的无环分子客体被锁定为一个单一的延伸构象,并且具有更长的柔性链的客体显示的构象迁移性比溶液中游离时小得多。如模型研究和配合物的自扩散常数所表明的,空腔的尺寸与客体的尺寸相适应。
A stiff-stilbene-linked bisporphyrin tweezer with inherent helicity was used for exciton-coupled circulardichroism (ECCD) characterization of a series of monotopically binding amine guest molecules. CD signals were observed for a variety of monoamines at relatively low tweezer/amine (host/guest) ratios between 1 : 10 to 1 : 70. For the amines producing the most intense CD signals, a binding stoichiometry
Synthesis and electrochemical investigation of β-alkyloxy substituted meso-tetraphenylporphyrins
作者:Hermann K. Hombrecher、Viviana M. Gherdan、Stefan Ohm、José A.S. Cavaleiro、Maria da Graça、P.M.S. Neves、Maria de Fátima Condesso
DOI:10.1016/s0040-4020(01)96263-5
日期:1993.9
The synthesis of β-alkyloxy substituted tetraphenylporphyrins is described. Due to interaction between the β-alkyloxy substituent and the meso-phenyl moiety the porphyrins are slightly non planar. The deviation from planarity in these compounds is investigated by cyclic voltammetry.
Kinetics of tautomerism in 2-substituted 5,10,15,20-tetraphenylporphyrins: directionality of proton transfer between the inner nitrogens
作者:Maxwell J. Crossley、Leslie D. Field、Margaret M. Harding、Sever Sternhell
DOI:10.1021/ja00242a015
日期:1987.4
the kinetics of proton transfer in 2-substituted5,10,15,20-tetraphenylporphyrins. Variable-temperature NMR studies on 16 2-substituted porphyrins showed that the position of the tautomeric equilibrium is altered by the substituent and that the tautomerism can be readily monitored by variable-temperature NMR spectroscopy. Activation parameters for the tautomerism were determined by saturation transfer
作者:Justyna Śniechowska、Piotr Paluch、Tomasz Pawlak、Grzegorz D. Bujacz、Witold Danikiewicz、Marek J. Potrzebowski
DOI:10.1039/c8ra02445f
日期:——
In this work we propose a completely newapproach for the synthesis of spirochlorin derivatives based on the use of an imino-keto intermediate formed in situ from 2-amino-5,10,15,20-tetraphenylporphyrins and inverse electron demand Diels–Alder (iEDDA) cycloaddition with 3,6-di-2-pyridyl-1,2,4,5-tetrazine. The mechanism of reaction was analyzed employing theoretical methods by comparing the difference
在这项工作中,我们提出了一种全新的螺二氢衍生物合成方法,该方法基于使用由 2-氨基-5,10,15,20-四苯基卟啉原位形成的亚氨基酮中间体和逆电子需求 Diels-Alder( iEDDA)与 3,6-二-2-吡啶基-1,2,4,5-四嗪的环加成。通过比较合适试剂的前沿分子轨道(FMO)能量差异,采用理论方法分析了反应机理。基态分子静电(ESP)电势图被用作附加工具,可以解释底物的反应性。通过质谱、红外、液态和固态核磁共振以及 X 射线晶体学对新型螺二氢化合物进行了全面表征。讨论了所得标题化合物的分子结构和光学性质之间的相关性。
Porphyrin analogues of Tröger's base: large chiral cavities with a bimetallic binding site
作者:Maxwell J. Crossley、Trevor W. Hambley、Lindsey G. Mackay、Andrew C. Try、Robin Walton
DOI:10.1039/c39950001077
日期:——
formaldehyde to give good yields of the corresponding octaaryl derivatives of the Tröger's base analogue in which two porphyrins are covalently Jinked by a diazocine bridge; the X-ray crystal-structure of the bis(tetraphenylporphyrinato)dipalladium(II) derivative 6 reveals a concave chiral cavity with two metal ion binding sites suitable for ditopic interactions with guest molecules.