| Revista: | Journal of the Brazilian Chemical Society |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000311335 |
| ISSN: | 0103-5053 |
| Autores: | Ribeiro, Marcela G1 Azzellini, Gianluca C |
| Instituciones: | 1Universidade de Sao Paulo, Instituto de Quimica, Sao Paulo. Brasil |
| Año: | 2003 |
| Periodo: | Dic |
| Volumen: | 14 |
| Número: | 6 |
| Paginación: | 914-921 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | There is great interest in the investigation of heterodimers formed by metalloporphyrins and metallophthalocyanines grafted with oppositely charged substituents, since these systems are models of the photosynthetic special pair and promising unidirectional electron transfer molecular devices. In the present study new cationic metalloporphyrin derivatives were synthesized and their association with anionic metallophthalocyanines forming heteroaggregates, investigated. These new cationic porphyrins derivatives show benzylic groups bound to the pyridyl nitrogen atoms of tetra-(pyridyl)porphyrin (TPyP), resulting in additional p systems and more hydrophobic compounds if compared with tetra-(methylpiridinium)porphyrin (H2TMPyP) and tetra-(trimethylaminophenyl)porphyrin (H2TAPP) ligands. It could be observed that both stoichiometry and association constants between cationic porphyrins and anionic phthalocyanines depend on the metal complexed to the macrocycles. Zn(II)porphyrins form preferentially aggregates of 1:1 stoichiometry (porphyrin:phthalocyanine), but when the porphyrin is coordinated to Pd(II) 1:1 and 1:2 (porphyrin:phthalocyanine) aggregates are present in solution. The K PI values are always higher for the heterodimers ZnPorphyrin/CuPhthalocyanine; this behavior is related to the less pronounced out-of-plane distortion of Cu-N compared to Ni-N binding, as a result of axial ligation of a DMSO molecule to the metal ion inserted into the macrocycle core. The K PI values are lower for the heterodimers containing the porphyrins th |
| Disciplinas: | Química |
| Palabras clave: | Bioquímica, Porfirinas catiónicas, Heterodímeros, Fotosíntesis |
| Keyword: | Chemistry, Biochemistry, Cationic porphyrins, Heterodimers, Photosynthesis |
| Texto completo: | Texto completo (Ver HTML) |
