http://www.cnr.it/ontology/cnr/individuo/prodotto/ID50856
A Versatile Bis-porphyrin Tweezer Host for the Assembly of Non-Covalent Photoactive Architectures: a Photophysical Characterization of the Tweezers and Associates with Porphyrins and Other Guests (Articolo in rivista)
- Type
- Label
- A Versatile Bis-porphyrin Tweezer Host for the Assembly of Non-Covalent Photoactive Architectures: a Photophysical Characterization of the Tweezers and Associates with Porphyrins and Other Guests (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Alternative label
L. Flamigni, A. M. Talarico, B. Ventura, R. Rein and N. Solladié, (2006)
A Versatile Bis-porphyrin Tweezer Host for the Assembly of Non-Covalent Photoactive Architectures: a Photophysical Characterization of the Tweezers and Associates with Porphyrins and Other Guests
in Chemistry (Weinh., Print)
(literal)
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- L. Flamigni, A. M. Talarico, B. Ventura, R. Rein and N. Solladié, (literal)
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- Rivista
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto per la Sintesi Organica e FotoreattivitaA (ISOF), CNR. Via P. Gobetti 101, 40129 Bologna (Italy)
Groupe de Synthese de Systemes Porphyriniques (G2SP), Laboratoire de Chimie de Coordination du CNRS (UPR 8241). 205 route de Narbonne, 31077 Toulouse Cedex 4 (France) (literal)
- Titolo
- A Versatile Bis-porphyrin Tweezer Host for the Assembly of Non-Covalent Photoactive Architectures: a Photophysical Characterization of the Tweezers and Associates with Porphyrins and Other Guests (literal)
- Abstract
- A bis(ZnII-porphyrin) tweezer
host with anthracene components as
apex and side-arms has been synthesized.
Mono- (pyridine) and bidentate
(4,4'-bipyridine) guests were used as
models for single and double axial coordination
inside the cavity, respectively.
A series of dipyridylporphyrin
guests with different substitution patterns
and excited-state energy levels
have association constants with the
tweezers that are of the order of
106m?1, which is indicative of complexation
with the inside of the cavity. This
complexation can only occur upon an
important distortion of the cavity that
opens the bite by about 30%. This
characteristic, in conjunction with their
ability to reduce the bite distance by
rotation around single bonds, makes
these porphyrin tweezers amongst the
most versatile so far reported, with
tuning of the bite distance in the range
of approximately 5-20 :. Energy transfer
to the free-base guest within the triporphyrin
complex is nearly quantitative
(95-98%) and the rates of transfer
are consistent with a Fçrster mechanism
that is characterized by a reduced
orientation factor. (literal)
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