Papers of Interest

Facts “Iron and manganese porphyrins are widely used to mimic monooxygenase catalytic functions, hemoglobin and myoglobin oxygen transfer, and photosynthetic electron transfer processes.”
(V. Borovkov, Y. Inoue)
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b-Substituted porphyrins are usually synthesized by the ‘3+1’ technique known as MacDonald condensation. Moreover, this procedure affords new aromatic porphyrinoid systems, including benzene- and pyridine-containing macrocycles and carba porphyrins, by utilizing other aromatic aldehydes.”
(S. Taniguchi)
Chemical Abstracts
“The past decade has seen increasing attention being paid to the synthesis of novel porphyrinoid aromatic compounds. A large number of these macrocyclic structures, including ‘expanded porphyrins’, has been reported recently. The interest in cyclic polypyrrole systems and their heteroanalogues is based on their potential application as photosensitizers in the treatment of cancer by photodynamic therapy, and as highly selective catalysts and organic electrical conductors.”
(R. Pandey)
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“Porphyrin dimers have been attracting considerable attention as biomimetic models of photosynthetic systems, and as photonic materials and functional molecular devices.”
(T. Ogawa, A. Osuka)
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“Tetrapyrrolic macrocycles play a number of critical biological roles such as: molecular binding, reaction catalysis, electron transfer, energy transfer and light-harvesting.”
(A. Burrell, D. Officer)
“It is of current concern to construct large porphyrin arrays in relation to the design of artificial molecular system aiming at mimicking the structure and function of photosynthetic centers. Thus, various interactions such as liquid crystals, membrane-mimetic aggregates, hydrogen-binding interactions, metal-ligand interactions, etc. have been utilized to assemble porphyrins into the specific ordered structures.”
(S. Shinkai)
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“Applications of singlet oxygen producing photosensitizers phthalocyanines and porphyrins in photodynamic therapy posed a question: How will proteins and DNA change photochemical and photophysical properties of the sensitizers and subsequent photoinduced reactions.”
(K. Lang)
“In the natural photosynthetic system, the porphyrin derivatives are known to form elaborate light-harvesting antenna complexes, which absorb low-intensity sunlight and funnel energy to the reaction center. [...]. Our final aim is to establish efficient catalysis for the artificial water photolysis to convert solar energy to chemical energy.”
(M. Kaneko)
“A variety of structurally modified porphyrins including porphyrin isomers, heteroatom-substituted porphyrins, and expanded and contracted porphyrins have been synthesized in recent years. Among these porphyrin variants, inverted or N-confused porphyrins are of particular interest since they form metal complexes with metal-carbon bonds under mild conditions.”
(A. Ghosh)
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“The remarkable stability of the porphyrin nucleus is well known and is caused partly by the aromatic nature of this macrocyclic system. Porphyrins can be viewed as diaza-bridged annulenes and hence may be considered to be nature's [18]annulene.”
(T. Lash)
“Porphyrins and metalloporphyrins continue to be a subject of intense interdisciplinary research. Due to the crucial role these molecules play in biological processes such as photosynthesis, oxygen transport, and activation, they have been labeled ‘pigments of life’. Numerous publications have been devoted to potential applications of porphyrins in medicine as phototherapeutic agents and in material sciences, e.g., as molecular wires.”
(J. Waluk)
“Porphyrinoids (summary expression for the porphyrins and their structural variants) are of fundamental importance in organic chemistry. Commanding interdisciplinary interest, porphyrinoids have been subjected over the years to virtually all pertinent methods of physical and chemical investigation available to the organic chemist. Porphycene, a tetrapyrrole macrocycle with effective D2h symmetry, is the most simple structural variant of porphyrin.”
(B. Frydman)
“Porphin, the parent compound of the porphyrins, contains a central 16-membered ring that corresponds to the dianion of [16]-85-annulene in configuration and conformation (planar) [...]. Porphin may be regarded alternatively as a diaza[18]annulene (outer pathway of conjugation) or as a tetraaza[16]annulene dianion (inner pathway of conjugation). The [16]annulene dianion model appears to be especially suited for the understanding of the spectroscopic properties of metalloporphyrins.”
(E. Vogel)
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