Furan-based porphyrins:: Tetraoxa[4n+2]porphyrin dications with 18π-, 22π-, or 26π-electron systems

被引：0

作者：

Vogel, E

Jux, N

Dörr, J

Pelster, T

Berg, T

Böhm, HS

Behrens, F

Lex, J

Bremm, D

Hohlneicher, G

机构：

[1] Univ Cologne, Dept Organ Chem, D-50939 Cologne, Germany

[2] Univ Cologne, Inst Chem Phys, D-50939 Cologne, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2000年 / 39卷 / 06期

关键词：

annulenes; aromaticity; dications; porphyrinoids; UV/Vis spectroscopy;

D O I：

10.1002/(SICI)1521-3773(20000317)39:6<1101::AID-ANIE1101>3.0.CO;2-F

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A reference example for the significance of molecular symmetry in UV/Vis spectroscopy is shown by the spectra of the three planar octaethyltetraoxa- [4n+2]porphyrin dications 1-3 (n = 4-6). Whereas the D(4h)-symmetric 18π and 26π dications 1 and 3 (the symmetry refers to the ring framework) exhibit very sharp Soret bands with record values for the molar extinction coefficients ε, the 22π dication 2, which only possesses C(2h) symmetry, shows a split Soret band with greatly reduced molecular extinction.

引用

页码：1101 / +

页数：6

共 23 条

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