scholarly journals Enantioselective [2+2] Cycloadditions of Cinnamate Esters: Generalizing Lewis Acid Catalysis of Triplet Energy Transfer

2019 ◽  
Vol 141 (24) ◽  
pp. 9543-9547 ◽  
Author(s):  
Mary Elisabeth Daub ◽  
Hoimin Jung ◽  
Byung Joo Lee ◽  
Joonghee Won ◽  
Mu-Hyun Baik ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis ◽  
Triplet Energy ◽  
Triplet Energy Transfer

scholarly journals Enantioselective photochemistry through Lewis acid–catalyzed triplet energy transfer

Science ◽  
2016 ◽  
Vol 354 (6318) ◽  
pp. 1391-1395 ◽  
Author(s):  
Travis R. Blum ◽  
Zachary D. Miller ◽  
Desiree M. Bates ◽  
Ilia A. Guzei ◽  
Tehshik P. Yoon
Keyword(s):  
Energy Transfer ◽  
Lewis Acid ◽  
Triplet Energy ◽  
Acid Catalyzed ◽  
Triplet Energy Transfer

scholarly journals Brønsted acid catalysis of photosensitized cycloadditions

2020 ◽  
Vol 11 (3) ◽  
pp. 856-861 ◽  
Author(s):  
Evan M. Sherbrook ◽  
Hoimin Jung ◽  
Dasol Cho ◽  
My-Hyun Baik ◽  
Tehshik P. Yoon
Keyword(s):  
Energy Transfer ◽  
Acid Catalysis ◽  
Reorganization Energy ◽  
Transfer Reactions ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Triplet Energy ◽  
Dft Computations ◽  
Brönsted Acid ◽  
Triplet Energy Transfer

Brønsted acids can catalyze triplet energy transfer reactions, and DFT computations suggest the unexpected importance of reorganization energy for catalysis.

Thymine Dimerization Induced by Oxidative DNA Lesions and Epigenetic Intermediates via Triplet-Triplet Energy Transfer

2020 ◽  
Author(s):  
Mauricio Lineros-Rosa ◽  
Antonio Francés-Monerris ◽  
Antonio Monari ◽  
Miguel Angél Miranda ◽  
Virginie Lhiaubet-Vallet
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Transient Absorption ◽  
Theoretical Calculations ◽  
Dna Lesions ◽  
Transient Absorption Spectroscopy ◽  
Triplet Energy ◽  
Pyrimidine Dimers ◽  
Triplet Energy Transfer ◽  
Dna Nucleobases

Interaction of nucleic acids with light is a scientific question of paramount relevance not only in the understanding of life functioning and evolution, but also in the insurgence of diseases such as malignant skin cancer and in the development of biomarkers and novel light-assisted therapeutic tools. This work shows that the UVA portion of sunlight, not absorbed by canonical DNA nucleobases, can be absorbed by 5-formyluracil (ForU) and 5-formylcytosine (ForC), two ubiquitous oxidative lesions and epigenetic intermediates present in living beings in natural conditions. We measure the strong propensity of these molecules to populate triplet excited states able to transfer the excitation energy to thymine-thymine dyads, inducing the formation of the highly toxic and mutagenic cyclobutane pyrimidine dimers (CPDs). By using steady-state and transient absorption spectroscopy, NMR, HPLC, and theoretical calculations, we quantify the differences in the triplet-triplet energy transfer mediated by ForU and ForC, revealing that the former is much more efficient in delivering the excitation energy and producing the CPD photoproduct. Although significantly slower than ForU, ForC is also able to harm DNA nucleobases and therefore this process has to be taken into account as a viable photosensitization mechanism. The present findings evidence a rich photochemistry crucial to understand DNA photodamage and of potential use in the development of biomarkers and non-conventional photodynamic therapy agents.

Triplet energy transfer in conjugated polymers. II. A polaron theory description addressing the influence of disorder

2008 ◽  
Vol 78 (4) ◽  
Author(s):  
Ivan I. Fishchuk ◽  
Andrey Kadashchuk ◽  
Lekshmi Sudha Devi ◽  
Paul Heremans ◽  
Heinz Bässler ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymers ◽  
Triplet Energy ◽  
Polaron Theory ◽  
Triplet Energy Transfer

Chiral Lewis Acid Catalysis in Nitrile Oxide Cycloadditions

2004 ◽  
Vol 126 (17) ◽  
pp. 5366-5367 ◽  
Author(s):  
Mukund P. Sibi ◽  
Kennosuke Itoh ◽  
Craig P. Jasperse
Keyword(s):  
Lewis Acid ◽  
Acid Catalysis ◽  
Nitrile Oxide ◽  
Lewis Acid Catalysis ◽  
Chiral Lewis Acid

Triplet Energy Transfer Insight in Coordination of Unsaturated Hydrocarbons by d0Bent Metallocenes (Zr, Hf)

2007 ◽  
Vol 111 (43) ◽  
pp. 10928-10937 ◽  
Author(s):  
Galina V. Loukova ◽  
Svetlana E. Starodubova ◽  
Vyatcheslav A. Smirnov
Keyword(s):  
Energy Transfer ◽  
Triplet Energy ◽  
Unsaturated Hydrocarbons ◽  
Triplet Energy Transfer
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