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Dirk M. Guldi - One of the best experts on this subject based on the ideXlab platform.
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formation and photophysics of a stable concave convex Supramolecular Complex of c60 and a substituted s triazine derivative
Chemical Communications, 2002Co-Authors: David I. Schuster, Joel Rosenthal, Shaun Macmahon, Peter D Jarowski, Christopher A Alabi, Dirk M. GuldiAbstract:Spectroscopic, electrochemical and computational data show that C60 and a highly phenylated s-triazine derivative form a stable Supramolecular Complex at micromolar concentrations in solution at ambient temperatures, due to strong van der Waals attraction between their complementary surfaces.
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Formation and photophysics of a stable concave–convex Supramolecular Complex of C60 and a substituted s-triazine derivative
Chemical Communications, 2002Co-Authors: David I. Schuster, Joel Rosenthal, Shaun Macmahon, Peter D Jarowski, Christopher A Alabi, Dirk M. GuldiAbstract:Spectroscopic, electrochemical and computational data show that C60 and a highly phenylated s-triazine derivative form a stable Supramolecular Complex at micromolar concentrations in solution at ambient temperatures, due to strong van der Waals attraction between their complementary surfaces.
David I. Schuster - One of the best experts on this subject based on the ideXlab platform.
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formation and photophysics of a stable concave convex Supramolecular Complex of c60 and a substituted s triazine derivative
Chemical Communications, 2002Co-Authors: David I. Schuster, Joel Rosenthal, Shaun Macmahon, Peter D Jarowski, Christopher A Alabi, Dirk M. GuldiAbstract:Spectroscopic, electrochemical and computational data show that C60 and a highly phenylated s-triazine derivative form a stable Supramolecular Complex at micromolar concentrations in solution at ambient temperatures, due to strong van der Waals attraction between their complementary surfaces.
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Formation and photophysics of a stable concave–convex Supramolecular Complex of C60 and a substituted s-triazine derivative
Chemical Communications, 2002Co-Authors: David I. Schuster, Joel Rosenthal, Shaun Macmahon, Peter D Jarowski, Christopher A Alabi, Dirk M. GuldiAbstract:Spectroscopic, electrochemical and computational data show that C60 and a highly phenylated s-triazine derivative form a stable Supramolecular Complex at micromolar concentrations in solution at ambient temperatures, due to strong van der Waals attraction between their complementary surfaces.
E J Boekem - One of the best experts on this subject based on the ideXlab platform.
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Heptameric association of light-harvesting Complex II trimers in partially solubilized photosystem II membranes.
FEBS letters, 1999Co-Authors: J. P. Dekker, Henny Van Roon, E J BoekemAbstract:We report a structural characterization by electron microscopy and image analysis of a Supramolecular Complex consisting of seven trimeric light-harvesting Complex II proteins. The Complex was readily observed in partially-solubilized Tris-washed photosystem II membranes from spinach but was also found to occur, with a low frequency, in oxygen-evolving photosystem II membranes. The structure reveals six peripheral trimers with the same rotational orientation and a central trimer with the opposite orientation. We conclude that the heptamer represents a naturally occurring aggregation state of part of the light-harvesting Complex II trimers in the thylakoid membranes.
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Heptameric association of light‐harvesting Complex II trimers in partially solubilized photosystem II membranes
FEBS Letters, 1999Co-Authors: J. P. Dekker, Henny Van Roon, E J BoekemAbstract:Abstract We report a structural characterization by electron microscopy and image analysis of a Supramolecular Complex consisting of seven trimeric light-harvesting Complex II proteins. The Complex was readily observed in partially-solubilized Tris-washed photosystem II membranes from spinach but was also found to occur, with a low frequency, in oxygen-evolving photosystem II membranes. The structure reveals six peripheral trimers with the same rotational orientation and a central trimer with the opposite orientation. We conclude that the heptamer represents a naturally occurring aggregation state of part of the light-harvesting Complex II trimers in the thylakoid membranes.
Shunichi Fukuzumi - One of the best experts on this subject based on the ideXlab platform.
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electron transfer in a Supramolecular Complex of zinc chlorin carboxylate anion with li c60 affording the long lived charge separated state
Journal of Physical Chemistry C, 2013Co-Authors: Yuki Kawashima, Kei Ohkubo, Mase Kentaro, Shunichi FukuzumiAbstract:A Supramolecular Complex was formed between zinc chlorin carboxylate (ZnCh–) and lithium ion-encapsulated [60]fullerene (Li+@C60) by an electrostatic interaction in benzonitrile (PhCN). The binding constant was determined to be 7.7 × 104 M–1. No fluorescence quenching of ZnCh– was observed upon addition of Li+@C60, indicating that no electron transfer (ET) from the singlet excited state of ZnCh– (1[ZnCh–]*) to Li+@C60 occurred. In contrast, the transient absorption band due to triplet excited state of ZnCh– (3[ZnCh–]*) was efficiently quenched by ET from 3[ZnCh–]* to Li+@C60 to produce the charge-separated (CS) state, [ZnCh–]•+/Li+@C60•–, with the rate constant of kET = 5.3 × 104 s–1. The charge-recombination dynamics was monitored by the decay of the transient absorption band at 1035 nm due to Li+@C60•–. The lifetime of the CS state was determined to be 170 μs. The spin state of CS state was triplet determined by EPR measurements at low temperature. The reorganization energy (λ) and electronic coupling t...
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Photoinduced electron transfer in Supramolecular Complexes of a π-extended viologen with porphyrin monomer and dimer
RSC Advances, 2012Co-Authors: Shunichi Fukuzumi, Kei Ohkubo, Ichiro Amasaki, Claude P. Gros, Roger Guilard, Jean-michel BarbeAbstract:A π-extended viologen has been synthesized, forming Supramolecular Complexes with a freebase tetraphenylporphyrin (H2TPP) and the cofacial porphyrin dimer with an anthracene spacer [H4(DPA)] through π–π interaction in benzonitrile (PhCN). Formation of the H2TPP-BHV2+ Supramolecular Complex was probed by UV-vis and fluorescence spectra. The fluorescence of H2TPP was strongly quenched by electron transfer from the singlet excited state (1H2TPP*) to BHV2+ in the Supramolecular Complex. The transient absorption spectrum of the charge-separated (CS) state (H2TPP•+ and BHV•+) was successfully detected by the laser flash photolysis measurements of the H2TPP-BHV2+ Supramolecular Complex in PhCN. The lifetime of the CS state of the Supramolecular Complex was determined as 0.37 ms in PhCN at 298 K. The H4(DPA)-BHV2+ Supramolecular Complex was formed with a larger formation constant as compared to the H2TPP-BHV2+ Supramolecular Complex because of the stronger π–π interaction of BHV2+ with the cofacial porphyrin dimer and the lifetime of the CS state was determined to be 0.59 ms in PhCN at 298 K.
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umpolung photoinduced charge separation in an anion bound Supramolecular Complex
Journal of the American Chemical Society, 2008Co-Authors: Jonathan L Sessler, Kei Ohkubo, Elizabeth Karnas, Sung Kuk Kim, Min Zhang, Karl M Kadish, Shunichi FukuzumiAbstract:A new Supramolecular system, consisting of an expanded porphyrin, cyclo[8]pyrrole (C8) and a pyrene carboxylate (Py) is capable not only of electron transfer upon photoexcitation, but results in “u...
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Strong Inhibition of Singlet Oxygen Sensitization in Pyridylferrocene−Fluorinated Zinc Porphyrin Supramolecular Complexes
The Journal of Physical Chemistry A, 2003Co-Authors: Yukiyasu Kashiwagi, Hiroshi Imahori, Yasuyuki Araki, Osamu Ito, Koji Yamada, Yoshiteru Sakata, Shunichi FukuzumiAbstract:A Supramolecular pyridylferrocene (PyFc)−fluorinated zinc porphyrin (ZnTFPP) dyad system was developed, and its photodynamics was investigated in dichloromethane and acetonitrile. The nitrogen of PyFc coordinates to the metal center of zinc porphyrin to form a Supramolecular donor−acceptor Complex. Formation of the pyridylferrocene−zinc porphyrin supramolecule was probed by 1H NMR and UV−vis spectroscopy. The one-electron reduction potential of ZnTFPP in dichloromethane is shifted to a negative direction by 0.08 V due to formation of the Supramolecular Complex with PyFc. The binding constant of ZnTFPP•- with PyFc in the Supramolecular Complex determined from the potential shift is much smaller than the binding constant of the neutral form, ZnTFPP. The fluorescence of ZnTFPP is strongly quenched by electron transfer from PyFc to the singlet excited state (1ZnTFPP*) in the Supramolecular Complex of ZnTFPP with PyFc. The lifetime of 1ZnTFPP* is also shortened significantly in the Supramolecular Complex. No t...
Joel Rosenthal - One of the best experts on this subject based on the ideXlab platform.
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formation and photophysics of a stable concave convex Supramolecular Complex of c60 and a substituted s triazine derivative
Chemical Communications, 2002Co-Authors: David I. Schuster, Joel Rosenthal, Shaun Macmahon, Peter D Jarowski, Christopher A Alabi, Dirk M. GuldiAbstract:Spectroscopic, electrochemical and computational data show that C60 and a highly phenylated s-triazine derivative form a stable Supramolecular Complex at micromolar concentrations in solution at ambient temperatures, due to strong van der Waals attraction between their complementary surfaces.
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Formation and photophysics of a stable concave–convex Supramolecular Complex of C60 and a substituted s-triazine derivative
Chemical Communications, 2002Co-Authors: David I. Schuster, Joel Rosenthal, Shaun Macmahon, Peter D Jarowski, Christopher A Alabi, Dirk M. GuldiAbstract:Spectroscopic, electrochemical and computational data show that C60 and a highly phenylated s-triazine derivative form a stable Supramolecular Complex at micromolar concentrations in solution at ambient temperatures, due to strong van der Waals attraction between their complementary surfaces.
