scholarly journals Improved light absorbance does not lead to better DSC performance: studies on a ruthenium porphyrin–terpyridine conjugate

RSC Advances ◽  
2016 ◽  
Vol 6 (19) ◽  
pp. 15370-15381 ◽  
Author(s):  
Angelo Lanzilotto ◽  
Laura A. Büldt ◽  
Hauke C. Schmidt ◽  
Alessandro Prescimone ◽  
Oliver S. Wenger ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Performance Studies ◽  
Ruthenium Complex ◽  
Energy Transfer Process ◽  
Spectral Response ◽  
Photoconversion Efficiency ◽  
Triplet Energy ◽  
Light Absorbance ◽  
Triplet Energy Transfer ◽  
Ruthenium Porphyrin

Despite having a good spectral response, a bis(tpy)ruthenium complex with peripheral porphyrin and phosphonate anchoring domains gives poor photoconversion efficiency due to a triplet–triplet energy transfer process.

scholarly journals Singlet and triplet energy transfer dynamics in self-assembled axial porphyrin–anthracene complexes: towards supra-molecular structures for photon upconversion

2018 ◽  
Vol 20 (11) ◽  
pp. 7549-7558 ◽  
Author(s):  
Victor Gray ◽  
Betül Küçüköz ◽  
Fredrik Edhborg ◽  
Maria Abrahamsson ◽  
Kasper Moth-Poulsen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Molecular Structures ◽  
Triplet Energy ◽  
Self Assembled ◽  
Triplet Energy Transfer ◽  
Ruthenium Porphyrin

Singlet and triplet energy transfer dynamics in anthracene–ruthenium porphyrin complexes, and their application to photon upconversion.

Role of Structural Changes in the Triplet−Triplet Energy Transfer Process to Oxime Derivatives

2002 ◽  
Vol 106 (29) ◽  
pp. 6702-6709 ◽  
Author(s):  
Jacques Lalevée ◽  
Xavier Allonas ◽  
Frédéric Louërat ◽  
Jean Pierre Fouassier
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Structural Changes ◽  
Energy Transfer Process ◽  
Triplet Energy ◽  
Oxime Derivatives ◽  
Triplet Energy Transfer

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.

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