Highly Efficient Light-Harvesting System Based on a Phosphorescent Acceptor Coupled with Dendrimer Donors via Singlet−Singlet and Triplet−Triplet Energy Transfer

2007 ◽  
Vol 19 (15) ◽  
pp. 3673-3680 ◽  
Author(s):  
Tae-Hyuk Kwon ◽  
Myoung Ki Kim ◽  
Jongchul Kwon ◽  
Dae-Yup Shin ◽  
Su Jin Park ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Triplet Energy ◽  
Highly Efficient ◽  
Triplet Energy Transfer

scholarly journals Boron-Enabled Geometric Isomerization of Small Alkene Fragments via Selective Energy Transfer Catalysis

2020 ◽  
Author(s):  
John James Molloy ◽  
Michael Schäfers ◽  
Max Wienhold ◽  
Tobias Morack ◽  
Constantin G. Daniliuc ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Retinoic Acid ◽  
Visual Cycle ◽  
Triplet Energy ◽  
Molecular Precursors ◽  
Highly Efficient ◽  
Geometric Isomerization ◽  
Gating Mechanism ◽  
Triplet Energy Transfer

The mammalian visual cycle epitomizes the importance of complex polyenes in biology. However, isomerization-based strategies to enable the sterodivergent construction of these important biomolecules from geometrically defined alkene linchpins remain conspicuously underdeveloped. Mitigating the thermodynamic constraints inherent to isomerization is further frustrated by the considerations of atom efficiency in idealized low molecular precursors. Herein, we report a general ambiphilic C3 scaffold that can be isomerized and bi-directionally extended. Predicated on highly efficient triplet energy transfer, the selective isomerization of β-15 borylacrylates is contingent on the participation of the boron p-orbital in the substrate chromophore. Rotation of the C(sp2)-B bond by 90° in the product renders re-excitation inefficient and endows directionality. This subtle stereoelectronic gating mechanism enables the stereocontrolled syntheses of well-defined retinoic acid derivatives.<br>

scholarly journals Boron-Enabled Geometric Isomerization of Small Alkene Fragments via Selective Energy Transfer Catalysis

2020 ◽  
Author(s):  
John James Molloy ◽  
Michael Schäfers ◽  
Max Wienhold ◽  
Tobias Morack ◽  
Constantin G. Daniliuc ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Retinoic Acid ◽  
Visual Cycle ◽  
Triplet Energy ◽  
Molecular Precursors ◽  
Highly Efficient ◽  
Geometric Isomerization ◽  
Gating Mechanism ◽  
Triplet Energy Transfer

The mammalian visual cycle epitomizes the importance of complex polyenes in biology. However, isomerization-based strategies to enable the sterodivergent construction of these important biomolecules from geometrically defined alkene linchpins remain conspicuously underdeveloped. Mitigating the thermodynamic constraints inherent to isomerization is further frustrated by the considerations of atom efficiency in idealized low molecular precursors. Herein, we report a general ambiphilic C3 scaffold that can be isomerized and bi-directionally extended. Predicated on highly efficient triplet energy transfer, the selective isomerization of β-15 borylacrylates is contingent on the participation of the boron p-orbital in the substrate chromophore. Rotation of the C(sp2)-B bond by 90° in the product renders re-excitation inefficient and endows directionality. This subtle stereoelectronic gating mechanism enables the stereocontrolled syntheses of well-defined retinoic acid derivatives.<br>

scholarly journals Bodipy–C60 triple hydrogen bonding assemblies as heavy atom-free triplet photosensitizers: preparation and study of the singlet/triplet energy transfer

2015 ◽  
Vol 6 (7) ◽  
pp. 3724-3737 ◽  
Author(s):  
Song Guo ◽  
Liang Xu ◽  
Kejing Xu ◽  
Jianzhang Zhao ◽  
Betül Küçüköz ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Energy Transfer ◽  
Visible Light ◽  
Light Harvesting ◽  
Heavy Atom ◽  
Intersystem Crossing ◽  
Triplet Energy ◽  
Triplet Energy Transfer

Hydrogen bonding-mediated supramolecular triplet photosensitizers with easily interchangeable visible light-harvesting Bodipy modules and the fullerene intersystem crossing module were devised.

Enhancing Shielding of Triplet Energy Transfer to Poly(p-phenylene)s from Phosphor Dopant by Addition of Branched Alcohol for Highly Efficient Electrophosphorescence

2010 ◽  
Vol 2 (4) ◽  
pp. 1094-1099 ◽  
Author(s):  
Yu-Kai Huang ◽  
Tzu-Hao Jen ◽  
Yao-Tang Chang ◽  
Neng-Jye Yang ◽  
Hsin-Hung Lu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Triplet Energy ◽  
Highly Efficient ◽  
Triplet Energy Transfer

Boron-enabled geometric isomerization of alkenes via selective energy-transfer catalysis

Science ◽  
2020 ◽  
Vol 369 (6501) ◽  
pp. 302-306
Author(s):  
John J. Molloy ◽  
Michael Schäfer ◽  
Max Wienhold ◽  
Tobias Morack ◽  
Constantin G. Daniliuc ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Energy Transfer ◽  
Retinoic Acid ◽  
Low Molecular Weight ◽  
Triplet Energy ◽  
Highly Efficient ◽  
Geometric Isomerization ◽  
Gating Mechanism ◽  
Triplet Energy Transfer

Isomerization-based strategies to enable the stereodivergent construction of complex polyenes from geometrically defined alkene linchpins remain conspicuously underdeveloped. Mitigating the thermodynamic constraints inherent to isomerization is further frustrated by the considerations of atom efficiency in idealized low–molecular weight precursors. In this work, we report a general ambiphilic C3 scaffold that can be isomerized and bidirectionally extended. Predicated on highly efficient triplet energy transfer, the selective isomerization of β-borylacrylates is contingent on the participation of the boron p orbital in the substrate chromophore. Rotation of the C(sp2)–B bond by 90° in the product renders re-excitation inefficient and endows directionality. This subtle stereoelectronic gating mechanism enables the stereocontrolled syntheses of well-defined retinoic acid derivatives.

Carotenoids in photosynthesis

1978 ◽  
Vol 284 (1002) ◽  
pp. 569-579 ◽  
Keyword(s):  
Energy Transfer ◽  
Photosynthetic Bacteria ◽  
Light Harvesting ◽  
Protective Role ◽  
Reaction Centre ◽  
Triplet Energy ◽  
Photosynthetic Unit ◽  
Accessory Pigment ◽  
Light Harvesting Antenna ◽  
Triplet Energy Transfer

Carotenoids are usually considered to perform two major functions in photosynthesis. They serve as accessory light harvesting pigments, extending the range of wavelengths over which light can drive photosynthesis, and they act to protect the chlorophyllous pigments from the harmful photodestructive reaction which occurs in the presence of oxygen. Drawing upon recent work with photosynthetic bacteria, evidence is presented as to how the carotenoids are organized within both portions of the photosynthetic unit (the light harvesting antenna and the reaction centre) and how they discharge both their functions. The accessory pigment role is a singlet-singlet energy transfer from the carotenoid to the bacteriochlorophyll, while the protective role is a triplet-triplet energy transfer from the bacteriochlorophyll to the carotenoid.

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