Self-aggregation of 32-substituted bacteriochlorophyll-d analogs in aqueous micelle
| Autor: | Shunsuke Tani, Seiji Kanehisa, Hitoshi Tamiaki |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Porphyrins and Phthalocyanines. 27:97-104 |
| ISSN: | 1099-1409 1088-4246 |
| DOI: | 10.1142/s1088424622500675 |
| Popis: | As naturally occurring bacteriochlorophyll-[Formula: see text] models, zinc methyl (31R)-bacteriopheophorbides-[Formula: see text] possessing ethyl, vinyl, and ethynyl groups at the 32-position were prepared by chemically modifying chlorophyll-[Formula: see text]. The synthetic molecules self-aggregated in an aqueous Triton X-100 micelle solution similarly as in the major light-harvesting antenna of photosynthetic green bacteria to give supramolecularly ordered large oligomers with red-shifted and broadened visible absorption bands, compared with the monomeric bands. The sequential hydrogenation of the 32-ethynyl to ethyl group via the vinyl group gradually suppressed the chlorosomal self-aggregation ability. The successive elongation of the 31-alkyl chain from a methyl to propyl group via an ethyl group also diminished the [Formula: see text]-aggregation ability. These decreases in the self-aggregation were ascribable to the steric enhancement of the 32-substituents near the 31-hydroxy group requisite for the [Formula: see text]-aggregation. |
| Databáze: | OpenAIRE |
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