Journal ArticleDOI
Morphology-Dependent Photochemical Events in Aryl Ether Dendrimer Porphyrins: Cooperation of Dendron Subunits for Singlet Energy Transduction
Donglin Jiang,Takuzo Aida +1 more
TLDR
A series of dendrimer porphyrins ((L5)nP, n = 1−4), which bear different numbers (n) of five-layered dendron subunits at the meso-positions of a porphrin, were synthesized in this article.Abstract:
A series of dendrimer porphyrins ((L5)nP, n = 1−4), which bear different numbers (n) of five-layered dendron subunits (L5) at the meso-positions of a porphyrin, were synthesized. Upon excitation of the dendron subunits in CH2Cl2 at 20 °C, (L5)nP showed an intramolecular singlet energy transfer from the dendron subunits to the porphyrin core, where tetrasubstituted (L5)4P with a spherical morphology exhibited a much higher energy transfer quantum yield (ΦENT = 80.3%) than partially substituted (L5)1P−(L5)3P (10.1−31.6%). Fluorescence depolarization characteristics of (L5)4P indicated that the excitation energy migrates very efficiently over the continuous dendrimeric array of dialkoxybenzyl building units within the lifetime of the excited state. Consequently, the probability of energy transfer to the porphyrin core was enhanced.read more
Citations
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Photochemical Conversion of Solar Energy
TL;DR: The "grand challenge" for chemists is to find a convenient means for artificial conversion of solar energy into fuels, if chemists succeed to create an artificial photosynthetic process, as the Italian scientist Giacomo Ciamician forecast almost one hundred years ago.
Journal ArticleDOI
Dendritic Encapsulation of Function: Applying Nature's Site Isolation Principle from Biomimetics to Materials Science.
Stefan Hecht,Jean M. J. Fréchet +1 more
TL;DR: The recent progress in the synthesis of dendrimer-encapsulated molecules and their study by a variety of techniques is discussed, and a natural design principle that contributes to bridging the gap between biology and materials science is focused on.
Journal ArticleDOI
Multidimensional femtosecond correlation spectroscopies of electronic and vibrational excitations.
TL;DR: A classical-oscillator description of these spectroscopies in terms of interacting quasiparticles (rather than transitions among global eigenstates) sets the stage for designing new pulse sequences and inverting the multidimensional signals to yield molecular structures.
Journal ArticleDOI
Highly Efficient Mesoscopic Dye-Sensitized Solar Cells Based on Donor-Acceptor-Substituted Porphyrins
TL;DR: A greatly enhanced photovoltaic performance is observed when the porphyrin dye is cosensitized with a metal-free dye that has a complementary spectral response.
Journal ArticleDOI
Light-harvesting dendrimers
Alex Adronov,Jean M. J. Frechet +1 more
TL;DR: In this article, it has been realized that dendritic macromolecules can exhibit similar properties, though on a more modest scale, and they have been used as model systems in light-emitting diodes, signal amplifiers, fluorescent sensors, frequency converters, and other photonic devices.
References
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Crystal structure of an integral membrane light-harvesting complex from photosynthetic bacteria
Gerry McDermott,Stephen M. Prince,Andrew A. Freer,A. M. Hawthornthwaite-Lawless,Miroslav Z. Papiz,Richard J. Cogdell,Neil W. Isaacs +6 more
TL;DR: The crystal structure of the light harvesting antenna complex (LH2) from Rhodopseudomonas acidophila strain 10050 showed that the active assembly consists of two concentric cylinders of helical protein subunits which enclose the pigment molecules as discussed by the authors.
Journal ArticleDOI
Preparation of polymers with controlled molecular architecture. A new convergent approach to dendritic macromolecules
TL;DR: In this article, a convergent growth approach to topological macromolecules based on dendritic fragments is described, where polyether dendric fragments are prepared by starting from what will become the periphery of the molecule and progressing inward.
Journal ArticleDOI
Designing Dendrimers Based on Transition-Metal Complexes. Light-Harvesting Properties and Predetermined Redox Patterns
Vincenzo Balzani,Sebastiano Campagna,Gianfranco Denti,Alberto Juris,Scolastica Serroni,Margherita Venturi +5 more
Journal ArticleDOI
Energy transfer in dendritic macromolecules: Molecular size effects and the role of an energy gradient
TL;DR: In this paper, Perylene-terminated monodendrons 1−7 and phenylterminated reference monodenrons 8−14 have been synthesized, and the intramolecular energy transfer has been studied using steady-state as well as time-resolved fluorescence spectroscopy.
Journal ArticleDOI
Photoisomerization in dendrimers by harvesting of low-energy photons
Donglin Jiang,Takuzo Aida +1 more
TL;DR: In this paper, it was shown that in a macromolecular system that is designed to be insulated against collisional energy scattering, infrared absorption can excite photoisomerization by multiphoton intramolecular energy transfer.
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