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A cautionary tale of basic azo photoswitching in dichloromethane finally explained.
Commun Chem
November 2024
Department of Physics and Astronomy, York University, Toronto, ON, Canada.
Many studies of azobenzene photoswitches are carried out in polar aprotic solvents as a first principles characterization of thermal isomerization. Among the most convenient polar aprotic solvents are chlorinated hydrocarbons, such as DCM. However, studies of azobenzene thermal isomerization in such solvents have led to spurious, inconclusive, and irreproducible results, even when scrupulously cleaned and dried, a phenomenon not well understood.
View Article and Find Full Text PDFDialysate regeneration via urea photodecomposition with TiO nanowires at therapeutic rates.
Artif Organs
July 2023
Department of Materials Science & Engineering, University of Washington, Seattle, Washington, USA.
Article Synopsis
- Current hemodialysis treatment for end-stage renal disease patients is limited by lengthy sessions and large volumes of dialysate, which hampers the development of portable alternatives.
- Researchers have developed a method to regenerate dialysate using TiO nanowires, demonstrating effective urea removal and minimal production of harmful by-products.
- The study confirms that photodecomposition of urea at therapeutic rates using this technology could facilitate portable dialysis options, improving patient mobility and overall quality of life.
QuatCy: A Heptamethine Cyanine Modification With Improved Characteristics.
Theranostics
June 2020
Department of Chemistry, Texas A & M University, Box 30012, College Station, TX 77842, USA.
A major restriction on optical imaging techniques is the range of available fluorophores that are compatible with aqueous media without aggregation, absorb light above 750 nm with high extinction coefficients, fluoresce with relatively high quantum yields, and resist photodecomposition. Indocyanine green (ICG or in this paper) is an important example of a fluorophore that fits this description. Other dyes that are becoming increasingly prevalent are select heptamethine cyanine dyes (Cy7) which feature a cyclohexyl framework to rigidify the conjugated alkenes, and -chlorine substitution; MHI-148 () is one example.
View Article and Find Full Text PDFDegradation of benzophenone-4 in a UV/chlorine disinfection process: Mechanism and toxicity evaluation.
Chemosphere
May 2019
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, No. 163 Xianlin Avenue, Nanjing 210023, PR China.
This study investigated the degradation of benzophenone-4 (BP-4) in a UV/chlorine disinfection process, with chlorination and UV disinfection as comparisons. With a degradation efficiency of 80% after 10 s, the UV/chlorine process significantly enhanced the degradation of BP-4. However, a rebound of 36% of the initial concentration was observed in the UV/chlorine process ([free active chlorine (FAC)]:[BP-4] = 1:1, pH = 7).
View Article and Find Full Text PDFLipid vesicle-loaded meso-substituted chlorins of high in vitro antimicrobial photodynamic activity.
Photochem Photobiol Sci
January 2019
Centre of Molecular and Macromolecular Studies, Polish Academy of Science, Sienkiewicza 112, 90-363 Lodz, Poland.
Photodynamic inactivation potential against bacteria of four chlorin derivatives with phenyl or fluorophenyl substituents was evaluated. The quantum yield values of singlet oxygen formation were in the range of 0.16-0.
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