Atsuhiro Osuka

Scandium(III)-catalyzed oxidation of meso-meso-linked zinc(II)-porphyrin arrays (up to dodecamers) with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) led to efficient formation of triply meso-meso-, beta-beta-, and beta-beta-linked zinc(II)-oligoiporphyrins with 62 to 91% yields. These fused tape-shaped porphyrin arrays display extremely red-shifted absorption bands that reflect extensively pi-conjugated electronic systems and a low excitation gap. The lowest electronic absorption bands become

Conjugated porphyrin arrays that possess delocalised electronic networks have, for the most part, been assembled by using alkene or alkyne type bridging units or by directly connecting individual porphyrin chromophores with multiple bonds to form fused porphyrin arrays. Throughout the last two decades, such conjugated porphyrin arrays have been actively explored due to their attractive electronic, optical and electrochemical properties. This review aims to cover the multitude of synthetic method

The perpendicular arrangement of porphyrin units in dimer 1 is reflected in a large excitonic coupling that leads to splitting of the Soret bands and only modest spectral changes in the Q-bands. Compound 1 and the analogous trimer and tetramer are prepared by oxidative coupling of the corresponding 5,15-diarylporphyrin and are the first examples of compounds having direct meso, meso-linked porphyrin chromophores. Ar = 3,5-tBu2C6H3.

Covalently linked cyclic porphyrin arrays have been explored in recent years as artificial photosynthetic antenna. In this review we present the fundamental aspects of covalently linked cyclic porphyrin arrays by highlighting recent progress. The major emphasis of this tutorial review lies on the synthetic method, the structure, and the excitation energy transfer (EET) of such arrays. The final cyclization steps were often performed with the aid of templates. Efficient EET along the wheel is obs

Recently, expanded porphyrins have come to the forefront in the research field of aromaticity, and been recognized as the most appropriate molecular system to study both Hückel and Möbius aromaticity because their molecular topologies can be easily changed and controlled by various methods. Along with this advantage, many efforts have been devoted to the exploration of the aromaticity-molecular topology relationship based on electronic structures in expanded porphyrins so that further insight in

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of naphthalene-bridged porphyrin dimers and their orientation-dependent exciton couplingAtsuhiro. Osuka and Kazuhiro. MaruyamaCite this: J. Am. Chem. Soc. 1988, 110, 13, 4454–4456Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.1021/ja00221a079https://doi.org/10.1021/ja00221a079research-articleACS PublicationsRequest reuse permissionsArticle Views1690Al

meso-Aryl-substituted expanded porphyrins that are porphyrin homologues consisting of more than five pyrrolic units are a nice platform to realize diverse aromatic and antiaromatic species as well as stable radical species. They are also an ideal series to realize topologically twisted molecules with distinct Möbius aromaticity and antiaromaticity.

Various aromatic segments have been fused onto the porphyrin periphery to create porphyrinoids that have expanded π-conjugated networks and thus exhibit red-shifted absorption spectra. Fused coplanar porphyrin oligomers, represented by meso–meso, β–β, β–β triply linked porphyrin arrays (porphyrin tapes), are endued with more red-shifted absorption spectra and better nonlinear optical properties. These fused porphyrinoids have emerged as promising near-infrared (NIR) absorbing dyes, pointing to f

Up to 14 porphyrin rings are present in the title compounds 1, which are readily available with high regioselectivity from linear nickel-zinc porphyrins. Upon irradiation with light a rapid energy transfer from the peripheral porphyrin rings to the diporphyrin core takes place.

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