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Comprehensive Summary: Recently, photodynamic therapy (PDT) has attracted wide attention due to its less susceptibility to drug resistance, broad‐spectrum biocidal activity and biosafety in normal tissues. However, the traditional photosensitizers (PSs) face the disadvantage of poor therapeutic efficacy due to the requirement of an aerobic environment to generate 1O2 through Type ІI pathway. Herein, we designed and synthesized a novel cationic conjugated oligomer oligo(phenylene vinylene) (OPV) and studied its antibacterial photodynamic activity against both Gram‐negative Escherichia coli (E. coli) and Gram‐positive bacteria methicillin‐resistant Staphylococcus aureus (MRSA). Importantly, the OPV can rapidly produce reactive oxygen species (ROS) through double pathways, Type I and II mechanism under white light irradiation, and efficiently kill E. coli and MRSA at a nanomolar level. The dual type photosensitizing capability makes OPV promising for enhanced PDT to treat pathogens and tumors in complex environments. [ABSTRACT FROM AUTHOR]

Main observation and conclusion: The molecular weight of polymers plays a major role in their aggregation and miscibility in active layer, which eventually dominate the energy loss and device performance. A series of chlorine‐substituted PBD‐Cl polymers with controlled molecular weight have been synthesized as templates to discern a relationship between molecular weight and the optical properties, energy levels, morphologies, energy loss and photovoltaic performance. Although it has similar optical and electrochemical properties, when blended with acceptor N3, the low molecular weight polymer PBD‐ClL gives the biggest energy loss value, and a PCE of 12.06%. PBD‐ClH shows a moderate energy loss, but displays the lowest PCE of 9.00% as a result of excessive aggregation. PBD‐ClM with a medium molecular weight gives the smallest energy loss and achieves a PCE of 17.17%, which is among one of the highest values recorded to date for the Cl‐substituted polymer solar cells. Moreover, the molecular weight mainly affects the nonradiative energy loss (ΔE3), PBD‐ClM also shows the smallest value of 0.252 eV among three polymer donors. These results show the effect of controlling the molecular weight to achieve a small energy loss and provide guidelines which can lead to an understanding of the real photovoltaic performance of new materials. [ABSTRACT FROM AUTHOR]

Main observation and conclusion: The molecular weight of polymers plays a major role in their aggregation and miscibility in active layer, which eventually dominate the energy loss and device performance. A series of chlorine‐substituted PBD‐Cl polymers with controlled molecular weight have been synthesized as templates to discern a relationship between molecular weight and the optical properties, energy levels, morphologies, energy loss and photovoltaic performance. Although it has similar optical and electrochemical properties, when blended with acceptor N3, the low molecular weight polymer PBD‐ClL gives the biggest energy loss value, and a PCE of 12.06%. PBD‐ClH shows a moderate energy loss, but displays the lowest PCE of 9.00% as a result of excessive aggregation. PBD‐ClM with a medium molecular weight gives the smallest energy loss and achieves a PCE of 17.17%, which is among one of the highest values recorded to date for the Cl‐substituted polymer solar cells. Moreover, the molecular weight mainly affects the nonradiative energy loss (ΔE3), PBD‐ClM also shows the smallest value of 0.252 eV among three polymer donors. These results show the effect of controlling the molecular weight to achieve a small energy loss and provide guidelines which can lead to an understanding of the real photovoltaic performance of new materials. [ABSTRACT FROM AUTHOR]

A convenient protocol has been developed for the hydrogenation of metallo-protoporphyrin IX dimethyl esters (MPPDMEs) to their mesoporphyrin analogues using CoCl2-NaBH4 reagent system. Metallo-porphyrin complexes were found to perform as self-catalysts in this procedure. This method provides several advantages such as safe and simple procedure, short reaction time, high yields and low cost. [ABSTRACT FROM AUTHOR]