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Stimulus‐responsive molecular photochromic materials have potential applications in sensor, information storage, and optical switch devices since they undergo reversible color changes upon stimulus from external light. In this work, a viologen‐derived Mg(II) coordination complex with molecular formula [Mg(dpbp)2(H2O)4] (1) has been synthesized from 1‐(3,5‐dicarboxyphenyl)‐4,4′‐bipyridinium chloride (H2dpbp⋅Cl) under solvothermal conditions. Complex 1 has a three‐dimensional viologen‐based hydrogen bond network showing reversible photochromism through radical formation under ultraviolet‐visible light irradiation. Simultaneously, the emission of complex 1 can be reversibly modulated by ultraviolet‐visible light irradiation. Importantly, due to its reversible photochromic properties, practical fading time, and high stability, complex 1 can be used as an ink‐free and erasable printing medium by applying ultraviolet visible light irradiation with a mask. [ABSTRACT FROM AUTHOR]

With the development of new biochemical and computational methods, circular RNAs (circRNAs) have been identified as microRNA sponges. circRNAs are associated with many diseases, particularly cancer. The present study aimed to investigate the expression profile of circRNAs in irradiated A549 lung cancer cells using high-throughput sequencing. Bioinformatics analyses were used to examine the potential functions of circRNAs. RNA sequencing data demonstrated that 1,875 circRNA targets were differentially expressed in A549 cells in response to irradiation. A total of 30 circRNAs were upregulated and 37 circRNAs were downregulated significantly in irradiation-treated A549 cells (fold change ≥2.0; P<0.05). The top 5 upregulated and downregulated circRNAs were successfully validated by reverse transcription-quantitative PCR. In addition, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis suggested that differentially expressed circRNAs might be pivotal in biological irradiation responses to irradiation. circRNA-microRNA co-expression networks highlighted the biological significance of circRNA_0002174 and circRNA_0036627, which require further study. In conclusion, the present study is, to the best of the authors' knowledge, the first to describe the differentially expressed profile of circRNAs in response to irradiation in A549 cells. These results provide a new perspective to elucidate insight into the molecular mechanisms by which A549 cells respond to radiation, and a basis for a more in-depth analysis of the potential application of circRNAs in the treatment of lung cancer therapy. [ABSTRACT FROM AUTHOR]

[Display omitted] • Cd 0.9 Zn 0.1 S nanorods are grown on Ti 3 C 2 MXene to construct Cd 0.9 Zn 0.1 S/Ti 3 C 2 composites. • Cd 0.9 Zn 0.1 S/Ti 3 C 2 composite achieves the high hydrogen production rate of 4.50 mmol·h−1·g−1. • The transfer of photogenerated carriers from Cd 0.9 Zn 0.1 S nanorods to Ti 3 C 2 MXene is achieved. • The good electrical conductivity and large surface area of Ti 3 C 2 MXene are advantageous to photocatalysis. Ti 3 C 2 MXene as a high electrical conductivity with a large surface area, is widely used as a co-catalyst. In this work, 1D Cd 0.9 Zn 0.1 S nanorods (NRs) are grown on the surface of 2D Ti 3 C 2 MXene nanosheets (NSs) to construct 1D/2D Cd 0.9 Zn 0.1 S/Ti 3 C 2 nanocomposites, which reduce the stacking of Ti 3 C 2 MXene and increase the layer spacing. Cd 0.9 Zn 0.1 S/Ti 3 C 2 nanocomposite with 5 wt% Ti 3 C 2 MXene adding amount achieves the hydrogen production rate of 4.50 mmol·h−1·g−1, which is 1.7 times than that of pure Cd 0.9 Zn 0.1 S (2.65 mmol·h−1·g−1). The remarkable enhancement of its photocatalytic activity is mostly attributed to three factors. Firstly, the electron-hole separation and charge transfer on the heterojunction between 1D Cd 0.9 Zn 0.1 S NRs and Ti 3 C 2 MXene. Secondly, the 1D Cd 0.9 Zn 0.1 S nanorod structure can shorten the carrier transfer distance. Thirdly, the good electrical conductivity and large surface area of Ti 3 C 2 MXene nanosheets are advantageous to the separation and transfer of photogenerated electron-hole pairs and increase the reaction sites. [ABSTRACT FROM AUTHOR]

Organic amines are ubiquitous and essential in the dye, polymer, and pharmaceutical industries, but can also be highly corrosive and toxic. Developing a quick and efficient method to detect organic amines is an important challenge. In this paper, we demonstrate the detection of organic amines by colorimetric and luminescence sensing of an electron-deficient viologen metal organic material. The material, comprising 1-(3,5-dicarboxyphenyl)-4,4′-bipyridinium and Cd(II), possesses a two-dimensional framework with viologen-lined chromophores and accessible electron-deficient viologen moieties constituting Lewis acidic sites. It exhibits reversible photochromic behavior under UV–Vis light irradiation and a visual color change and fluorescence quenching upon contact with amine vapors and solutions. Due to the defined pore size of the framework, the fluorescence sensing efficiency showed organic amine size dependence. The vapochromism and fluorescence quenching is attributable to electron transfer from the organic amine to the electron-deficient viologen moiety, generating colored viologen radicals. An electron-deficient metal-organic material has successfully synthesized based on the viologen ligand, which exhibit reversible photochromic behavior and selective colorimetric and luminescence sensing of organic amines. [Display omitted] • An electron-deficient viologen metal-organic material was prepared. • Compound 1 exhibit reversible photochromic behavior under UV–visible light irradiation. • Complex 1 shows colorimetric and luminescence sensing of organic amines. [ABSTRACT FROM AUTHOR]