Design of π -extended dipyranylidenes as redox-active materials

Courté, Marc; Ng, Yong Xiang; Tang, Shasha; Fichou, Denis

doi:10.1016/j.dyepig.2021.109584

Dyes and Pigments

2021

DOI: 10.1016/j.dyepig.2021.109584

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Design of π -extended dipyranylidenes as redox-active materials

Marc Courté

Yong Xiang Ng

Shasha Tang

et al.

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Cited by 2 publications

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“…Table 4 summarizes the data on the quantum yield of singlet oxygen of CDs, measured by different groups. N-doped carbon dots [205] 19 Coal UV-Vis (DBPF) N,S-codoped carbon dots [206] 11 Dansyl chloride UV-Vis (DBPF) CQD [207] 71 Riboflavin Visible photoluminescence (SOSG) GQD [63] 130 Polythiphene derivative UV-Vis (Na-ADPA) CQD [208] 27 Polythiphene benzoic acid UV-Vis (Na-ADPA) Mn/HA-CQD [209] 40 Manganese atoms and hyaluronic acid UV-Vis (Na-ADPA) N,S-codoped CQDs [210] 8 Polythiphene derivative UV-Vis (Na-ADMA) Sn@S-CQD [211] 37 Sodium p-styrene sulfonate and SnCl 4 UV-Vis (ABDA) CQD [212] 5.7 Trinitropyrene Luminescence at 1270 nm Cu-CQD [213] 36 Poly(acrilic acid) and Cu(NO 3 ) 2 UV-Vis (ABDA) CQD [214] 62 pheophytin UV-Vis (DBPF) Mn-CD [215] 40 Manganese-phthalocyanine UV-Vis (DBPF) CQD [109] 33 PF 68 copolymer Luminescence at 1270 nm…”

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confidence: 99%

Lights and Dots toward Therapy—Carbon-Based Quantum Dots as New Agents for Photodynamic Therapy

et al. 2023

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The large number of deaths induced by carcinoma and infections indicates that the need for new, better, targeted therapy is higher than ever. Apart from classical treatments and medication, photodynamic therapy (PDT) is one of the possible approaches to cure these clinical conditions. This strategy offers several advantages, such as lower toxicity, selective treatment, faster recovery time, avoidance of systemic toxic effects, and others. Unfortunately, there is a small number of agents that are approved for usage in clinical PDT. Novel, efficient, biocompatible PDT agents are, thus, highly desired. One of the most promising candidates is represented by the broad family of carbon-based quantum dots, such as graphene quantum dots (GQDs), carbon quantum dots (CQDs), carbon nanodots (CNDs), and carbonized polymer dots (CPDs). In this review paper, these new smart nanomaterials are discussed as potential PDT agents, detailing their toxicity in the dark, and when they are exposed to light, as well as their effects on carcinoma and bacterial cells. The photoinduced effects of carbon-based quantum dots on bacteria and viruses are particularly interesting, since dots usually generate several highly toxic reactive oxygen species under blue light. These species are acting as bombs on pathogen cells, causing various devastating and toxic effects on those targets.

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confidence: 99%

Lights and Dots toward Therapy—Carbon-Based Quantum Dots as New Agents for Photodynamic Therapy

et al. 2023

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Towards Designer Photocatalysts: Structure‐Property Relationships in 2,6‐Diaryl‐pyryliums

Konzal,

Murley,

Wolter

et al. 2024

Chemistry A European J

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Fully organic photocatalyst systems are highly attractive, not merely because they are transition‐metal free, but more importantly due to their unique and often potent reactivity. A detailed understanding of the various redox states, both ground and excited state, and specifically what structural parameters control them is therefore crucial for harnessing the full potential of these systems in organic synthesis. However, unlike their organometallic counterparts, detailed structure‐property relationships for organic photocatalysts are largely absent from the literature. In this study, we demonstrate linear free‐energy relationships across a range of key photophysical and electrochemical properties of 2,6‐diarylpyryliums. Electronic absorption and emission maxima can be carefully tuned over the ranges of 83 nm and 102 nm respectively. Intramolecular charge transfer (ICT) interactions were revealed in cases of substitution with polarizable heavy‐atoms. A strong linear dependence of ground state reduction potentials on substituent electronics was observed. Notably, the excited state reduction potential, E*red, could be controlled over a range of nearly 1000 mV. Systematic errors in computational modeling of ground and excited state redox potentials were identified and corrected. We believe the quantitative structure‐property relationships identified here provide foundational tools for rational and predictive organic photocatalyst design.

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Design of π -extended dipyranylidenes as redox-active materials

Cited by 2 publications

References 34 publications

Lights and Dots toward Therapy—Carbon-Based Quantum Dots as New Agents for Photodynamic Therapy

Lights and Dots toward Therapy—Carbon-Based Quantum Dots as New Agents for Photodynamic Therapy

Towards Designer Photocatalysts: Structure‐Property Relationships in 2,6‐Diaryl‐pyryliums

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