Synthesis and photophysical properties of phthalocyanines having calixpyrrole units
Zn2+ and Co2+ metallated phthalocyanines having four calixpyrrole units have been prepared from a calixpyrrole phthalonitrile using Zn2+ or Co2+ salts as templates of a phthalocyanine macrocycle. Hostguest complexes between the anions (Cl-, F- and H2PO4-) and the calixpyrrole units are formed as evi...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Recursos: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/64099 |
| Acesso em linha: | https://riunet.upv.es/handle/10251/64099 |
| Access Level: | acceso abierto |
| Palavra-chave: | ZINC PHTHALOCYANINES CHARGE SEPARATION PHOTOCHEMISTRY PORPHYRINS COMPLEXES XANTHONE ELECTROCHEMISTRY CYCLODEXTRIN SUBSTITUENTS FULLERENES QUIMICA ORGANICA QUIMICA ANALITICA |
| Resumo: | Zn2+ and Co2+ metallated phthalocyanines having four calixpyrrole units have been prepared from a calixpyrrole phthalonitrile using Zn2+ or Co2+ salts as templates of a phthalocyanine macrocycle. Hostguest complexes between the anions (Cl-, F- and H2PO4-) and the calixpyrrole units are formed as evidenced by NMR, the shift in the reduction potential of the calixpyrrole units by cyclic voltammetry and by observation of two straight lines in the plot of the conductivity versus the amount of halide. While halides do not form complexes with Zn2+ or Co2+ ions of the phthalocyanine core in the ground state as evidenced by the lack of variation in the position of the Q-band in optical spectroscopy, upon 355 nm excitation, the apical metal-halide complex should be formed as a transient as evidenced by the comparison of the transient absorption spectra in the presence and absence of halides. |
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