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Author(s) -
Aratani Naoki,
Osuka Atsuhiro,
Kim Yong Hee,
Jeong Dae Hong,
Kim Dongho
Publication year - 2000
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(20000417)39:8<1335::aid-anie1335>3.0.co;2-5
Subject(s) - delocalized electron , porphyrin , exciton , supramolecular chemistry , materials science , wavelength , absorption (acoustics) , chromophore , metastability , spectral line , molecular physics , coupling (piping) , fluorescence , cover (algebra) , photochemistry , chemical physics , molecule , chemistry , optoelectronics , optics , physics , condensed matter physics , organic chemistry , astronomy , mechanical engineering , engineering , metallurgy , composite material
The cover picture shows a schematic representation of a supramolecular rod composed of meso – meso ‐coupled porphyrins. The Ag I ‐promoted meso – meso coupling of Zn II 5,15‐diarylporphyrins enabled regularly arranged arrays with 2–128 porphyrins to be assembled. An examination of the absorption spectra of these rods show that they all exhibit split Soret bands as a result of exciton coupling. As the number of porphyrins increases the low‐energy Soret band is shifted to longer wavelength while the high‐energy Soret band stays at nearly the same wavelength, which results in a progressive increase in the splitting energy. A study of the fluorescence spectra of the arrays shows the S 1 states are delocalized over 6–8 porphyrin units. The 128mer at 0.1‐μm long is the longest monodisperse, rodlike molecule so far known, and should, together with the smaller arrays, have the potential for application as light‐harvesting wires. Further details are reported by A. Osuka et al. on p. 1458 ff. [ Magnified Cover Picture ]