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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Horton, Peter
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2023β,β-directly linked porphyrin ringscitations
- 2023N=8 armchair graphene nanoribbonscitations
- 2020Oxidopolyborate chemistrycitations
- 2020Oxidopolyborate anions templated by transition-metal complex cations: Self-assembled syntheses and structural studies (XRD) of [Co(NH3)6]2[B4O5(OH)4]3·11H2O, [Ni(phen)3][B7O9(OH)5]·9.5H2O and [Zn(dac)2(H2O)2][B7O9(OH)5]·H2Ocitations
- 2019Syntheses, X-ray structures and characterisation of luminescent chromium(III) complexes incorporating 8-quinolinato ligandscitations
- 2018Two 1-D coordination polymers containing zinc(II) hexaborates: [Zn(en{B6O7(OH)6}]2H2O (en =1,2-diaminoethane) and [Zn(pn{B6O7(OH)6}]1.5H2O (pn = 1,2-diaminopropane)citations
- 2017Synthesis, XRD studies and NLO properties of [p-H2NC6H4CH2NH3][B5O6(OH)4]·1/2H2O and NLO properties of some related pentaborate(1−) saltscitations
- 2013The competition between halogen bonds (Br???O) and C–H???O hydrogen bonds: the structure of the acetone–bromine complex revisitedcitations
- 2011Synthesis and structures of mono and binuclear nickel(II) thiolate complexes of a dicompartmental pseudo-macrocycle with N(imine)2S2 and N(oxime)2S2 metal-binding sitescitations
- 2008Synthesis, structure, and supramolecular architecture of benzonitrile and pyridine adducts of bis(pentafluorophenyl)zinc: pentafluorophenyl-aryl interactions versus homoaromatic pairingcitations
- 2004Mixed valence Mn(II)/Mn(III) [3 x 3] grid complexes: structural, electrochemical, spectroscopic, and magnetic propertiescitations
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article
β,β-directly linked porphyrin rings
Abstract
<p>Cyclic porphyrin oligomers have been studied as models for photosynthetic light-harvesting antenna complexes and as potential receptors for supramolecular chemistry. Here, we report the synthesis of unprecedented β,β-directly linked cyclic zinc porphyrin oligomers, the trimer (CP3) and tetramer (CP4), by Yamamoto coupling of a 2,3-dibromoporphyrin precursor. Their three-dimensional structures were confirmed by nuclear magnetic resonance (NMR) spectroscopy, mass spectrometry, and single-crystal X-ray diffraction analyses. The minimum-energy geometries of CP3 and CP4 have propeller and saddle shapes, respectively, as calculated using density functional theory. Their different geometries result in distinct photophysical and electrochemical properties. The smaller dihedral angles between the porphyrin units in CP3, compared with CP4, result in stronger π-conjugation, splitting the ultraviolet-vis absorption bands and shifting them to longer wavelengths. Analysis of the crystallographic bond lengths indicates that the central benzene ring of the CP3 is partially aromatic [harmonic oscillator model of aromaticity (HOMA) 0.52], whereas the central cyclooctatetraene ring of the CP4 is non-aromatic (HOMA -0.02). The saddle-shaped structure of CP4 makes it a ditopic receptor for fullerenes, with affinity constants of (1.1 ± 0.4) × 10<sup>5</sup>M<sup>-1</sup>for C<sub>70</sub>and (2.2 ± 0.1) × 10<sup>4</sup>M<sup>-1</sup>for C<sub>60</sub>, respectively, in toluene solution at 298 K. The formation of a 1:2 complex with C<sub>60</sub>is confirmed by NMR titration and single-crystal X-ray diffraction.</p>