Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Noncovalent Synthesis in Aqueous Solution and Spectroscopic Characterization of Multi-Porphyrin Complexes |
| Abstract | The interactions of the tetracationic meso-tetrakis(N-methyl-4-pyridyl)porphyrin (H2TMPyP) and its metallo derivatives (MTMPyP) (where M=copper((II)), zinc((II)), and gold((III)) with the octa-anionic form (at neutral pH) of 5,11,17,23-tetrasulfonato-25,26,27,28-tetrakis(hydroxycarbonyl- methoxy)calix[4]arene (C4TsTc) lead to a series of complex species whose stoichiometry and porphyrin sequence can be easily tuned. Crystallographic, spectroscopic, and diffusion NMR studies converge towards a common picture in which a central 1:4 porphyrin/calixarene unit serves as a template for the formation of more complex species. These species arise by successive, stepwise addition of single porphyrin molecules above and below the plane of the 1:4 central core to ultimately give a 7:4 complex. Noticeably, the stoichiometry of the various complex species corresponds to the actual concentration ratio of porphyrins and calixarenes in solution allowing the stoichiometry of these species to be easily tuned. This behavior and the remarkable stability of these species allow homo-porphyrin and hetero-(metallo)porphyrin species to be formed with control of not only the stoichiometry but also the sequence of the porphyrin array. The flexibility and ease of this approach permit, in principle, the design and synthesis of porphyrin arrays for predetermined purposes. For example, we have shown that it is very easy to design and obtain mixed porphyrin species in which a foreseen photoinduced electron-transfer is indeed observed. |
| Source | Chemistry - A European Journal 12, pp. 2722–2729 |
| Journal | Chemistry - A European Journal |
| Editor | WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, Germania |
| Year | 2006 |
| Type | Articolo in rivista |
| Authors | Fabio G. Gulino (a); Rosaria Lauceri (b); Limor Frish (c); TamarEvan-Salem (c); Yoram Cohen (c); Rita De Zorzi (c); Silvano Geremia (d); Luigi Di Costanzo (d); Lucio Randaccio (d); Domenico Sciotto (a); Roberto Purrello (a) |
| Text | 182828 2006 ISI Web of Science WOS WOS_000236483400007 Scopus 2 s2.0 33645280060 Noncovalent Synthesis in Aqueous Solution and Spectroscopic Characterization of Multi Porphyrin Complexes Fabio G. Gulino a ; Rosaria Lauceri b ; Limor Frish c ; TamarEvan Salem c ; Yoram Cohen c ; Rita De Zorzi c ; Silvano Geremia d ; Luigi Di Costanzo d ; Lucio Randaccio d ; Domenico Sciotto a ; Roberto Purrello a a Dipartimento di Scienze Chimiche, Universita di Catania b Istituto di Biostrutture e Bioimmagini Sezione di Catania, CNR c School of Chemistry, Tel Aviv University d Centro di Eccellenza di Biocristallografia, Dipartimento di Scienze Chimiche, Universita di Trieste The interactions of the tetracationic meso tetrakis N methyl 4 pyridyl porphyrin H2TMPyP and its metallo derivatives MTMPyP where M=copper II , zinc II , and gold III with the octa anionic form at neutral pH of 5,11,17,23 tetrasulfonato 25,26,27,28 tetrakis hydroxycarbonyl methoxy calix 4 arene C4TsTc lead to a series of complex species whose stoichiometry and porphyrin sequence can be easily tuned. Crystallographic, spectroscopic, and diffusion NMR studies converge towards a common picture in which a central 1 4 porphyrin/calixarene unit serves as a template for the formation of more complex species. These species arise by successive, stepwise addition of single porphyrin molecules above and below the plane of the 1 4 central core to ultimately give a 7 4 complex. Noticeably, the stoichiometry of the various complex species corresponds to the actual concentration ratio of porphyrins and calixarenes in solution allowing the stoichiometry of these species to be easily tuned. This behavior and the remarkable stability of these species allow homo porphyrin and hetero metallo porphyrin species to be formed with control of not only the stoichiometry but also the sequence of the porphyrin array. The flexibility and ease of this approach permit, in principle, the design and synthesis of porphyrin arrays for predetermined purposes. For example, we have shown that it is very easy to design and obtain mixed porphyrin species in which a foreseen photoinduced electron transfer is indeed observed. 12 Noncovalent Synthesis in Aqueous Solution and Spectroscopic Characterization of Multi Porphyrin Complexes 3.pdf Articolo in rivista WILEY VCH Verlag GmbH Co. KGaA 1521 3765 Chemistry A European Journal Chemistry A European Journal rosaria.lauceri LAUCERI ROSARIA |