Synthesis of pseudoaromatic expanded porphyrin analogues
摘要:
Optically active expanded porphyrins bearing thiophene were synthesized by Schiff base forming reaction. The condensation of thiophene containing 1,14-bisformyl tripyrrane with aromatic diamines Failed to give desired macrocycles but condensation with aliphatic 1,2-diamines gave the desired products. The macrocycles synthesized tend to maintain 18 pi system and the ethylene bridge shows somewhat resistance toward oxidation. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of pseudoaromatic expanded porphyrin analogues
摘要:
Optically active expanded porphyrins bearing thiophene were synthesized by Schiff base forming reaction. The condensation of thiophene containing 1,14-bisformyl tripyrrane with aromatic diamines Failed to give desired macrocycles but condensation with aliphatic 1,2-diamines gave the desired products. The macrocycles synthesized tend to maintain 18 pi system and the ethylene bridge shows somewhat resistance toward oxidation. (C) 1999 Elsevier Science Ltd. All rights reserved.
The synthesis of a new class of carbazole based macrocycles via [3 + 1] acid-catalyzed condensation is reported. Spectroscopic investigations and computational studies imply that these macrocycles have a large influence on the electronic structure in comparison to previously reported carbazole based macrocycles. Macrocycle 8 bearing a furan ring reversibly binds aqueous Hg2+ with high affinity over
报道了通过[3 + 1]酸催化的缩合反应合成一类新的咔唑类大环化合物。光谱研究和计算研究表明,与以前报道的基于咔唑的大环化合物相比,这些大环化合物对电子结构的影响很大。带有呋喃环的大环8与其他M n +离子具有高亲和力,可逆地结合Hg 2+水溶液。检测限(LOD)约为。100 nM。通过X射线衍射分析确认了Hg 2+的结合。
Core-Modified<i>meso</i>-Aryl Hexaphyrins with an Internal Thiophene Bridge: Structure, Aromaticity, and Photodynamics
作者:Ganesan Karthik、Mahima Sneha、V. Prabhu Raja、Jong Min Lim、Dongho Kim、A. Srinivasan、Tavarekere K. Chandrashekar
DOI:10.1002/chem.201203737
日期:2013.2.4
synthesis of core‐modified meso aryl hexaphyrins with an internalthiophenebridge is reported. Introduction of the thiophenebridge alters the electronic structure as well as the π‐electron circuit, resulting in increases in singlet lifetime (τs) and the two‐photon absorption (TPA) cross‐section. Furthermore, for the sulfur derivative, the internalbridgingthiophene participates in a π‐electron conjugation
Cyclobis[2,5-(thiophenedimethane)-4,4′-(triphenylamine)] versus Its <i>S</i>,<i>S</i>-Dioxidized Macrocycle: Global Antiaromaticity and Intramolecular Dynamics
作者:Fernando Lopez-Garcia、Shaoqiang Dong、Yi Han、Johnathan Joo Cheng Lee、Pei Wen Ng、Chunyan Chi
DOI:10.1021/acs.orglett.1c02200
日期:2021.8.20
macrocycles containing benzenoid rings rarely show global aromaticity/antiaromaticity. Herein, we report an annulene-like macrocycle CBTT and its S,S-dioxidized macrocycle DOCBTT with alternative quinoidal thiophene/1,1-dioxide thiophene and triphenyl amine moieties. They both showed temperature-dependent intramolecular dynamics and global antiaromatic character with 32π electrons at low temperature. However
Core-modified porphyrins. Part 4: Steric effects on photophysical and biological properties in vitro
作者:Youngjae You、Scott L. Gibson、Russell Hilf、Tymish Y. Ohulchanskyy、Michael R. Detty
DOI:10.1016/j.bmc.2004.12.048
日期:2005.3
21,23-Dithiaporphyrins (2-10) were designed and prepared as analogues of 5,20-diphenyl-10,15-bis(4-carboxylatomethoxy)phenyl-21,23-dithiaporphyrin (1) to examine the impact of steric bulk at the 5- and 20-meso positions as well as the impact of symmetry. Changes at the meso positions had minimal impact on the UV-vis-near-IR absorption spectra, quantum yields for the generation of singlet oxygen, and quantum yields for fluorescence and some impact on values of the octanol/water partition coefficient. Of the compounds 1-10, 5-phenyl-20-(2-thienyl)-10,15-bis-(4-carboxylatomethoxy-phenyl)-21,23-dithiaporphyrin (3) showed the greatest phototoxicity toward cultured R3230AC cells, with 68% cell kill at 1 x 10(-7) M and irradiation with 5 J cm(-2) of 350-750 nm light. Results in this study suggest that smaller substituents on the meso ring and less symmetrical compounds are more effective as photosensitizers than compounds with two bulky substituents at adjoining meso sites and a higher symmetry. The mitochondria appear to be involved in the process of phototoxicity as determined by the inhibition of whole cell cytochrome c oxidase activity in cells treated with 3 and light. No impact upon mitochondrial cytochrome c oxidase activity was observed in cells treated with 3 and no light. Fluorescence microscopy studies suggest that the mitochondria are not initial sites of accumulation of 3. (c) 2004 Elsevier Ltd. All rights reserved.