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Chemical luminescence

Mojtaba Abdi-Jalebi, Zahra Andaji-Garmaroudi, Stefania Cacovich, Camille Stavrakas, Bertrand Philippe, Johannes M Richter, Mejd Alsari, Edward P Booker, Eline M Hutter, Andrew J Pearson, Samuele Lilliu, Tom J Savenije, Håkan Rensmo, Giorgio Divitini, Caterina Ducati, Richard H Friend, Samuel D Stranks
Metal halide perovskites are of great interest for various high-performance optoelectronic applications. The ability to tune the perovskite bandgap continuously by modifying the chemical composition opens up applications for perovskites as coloured emitters, in building-integrated photovoltaics, and as components of tandem photovoltaics to increase the power conversion efficiency. Nevertheless, performance is limited by non-radiative losses, with luminescence yields in state-of-the-art perovskite solar cells still far from 100 per cent under standard solar illumination conditions...
March 21, 2018: Nature
Debamalya Ghosh, Uma Dutta, Ariful Haque, Natalia E Mordvinova, Oleg I Lebedev, Kamalesh Pal, Arup Gayen, Md Motin Seikh, Partha Mahata
Here, we report the luminescence based sensing of trace amounts of nitroaromatic explosive organic compounds. The luminescence emission of nanosized spinel oxide ZnCr2O4 with high chemical and thermal stabilities has been used as a potential probe to detect such organic explosives. Low temperature solution combustion synthesized ZnCr2O4 oxide with an average particle size of ∼9 nm exhibits strong luminescence emission at 410 nm upon excitation at 260 nm in an aqueous suspension. The presence of nitroaromatics in ZnCr2O4 suspension dramatically suppresses the luminescence emission providing an opportunity to detect it quantitatively...
March 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Koichiro Takao, Satoru Tsushima
The carbonate ion is an effective quencher of uranyl(vi) luminescence and makes uranyl(vi) tricarbonate barely luminescent and photochemically inactive. We demonstrate here that photoexcited uranyl(vi) tricarbonate, *[UVIO2(CO3)3]4-, can however oxidize borohydrides (BH3X-, X = H, CN) to give boric acid and H2 gas, reducing itself to [UVO2(CO3)3]5-. This hypothesis was supported by UV-vis and NMR spectroscopy as well as quantum chemical calculations. The charge transfer states associated with photoreduction processes were modelled by density functional theory calculations...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yangbo Wang, Bingxiao Yang, Kun Chen, Enlong Zhou, Qinghua Zhang, Lisha Yin, Xiaoji Xie, Lin Gu, Ling Huang
Scandium (Sc) sits at a unique position in the periodic table, i.e., the junction of the top of the rare earth column and the beginning of the transition metal row. Studies have shown that Sc-based nanomaterials are very sensitive to the surrounding chemical environment. A simple adjustment of the chemical reaction conditions such as temperature, surfactant molecules, and solvents (e.g., oleic acid (OA) or 1-octadecene (OD)) can easily lead to different products in terms of chemical composition and phase structure...
March 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Zhou Hong, Juan Li, Sangita Biswas, Cheng-Shuai Jiang, Yu Huang, Tao Sun, Yang Niu, Jian-Qiang Yu, Wei-Qi Li, Yao Yao
Tamarix ramosissima is a traditional Chinese herbal medicine used for rheumatoid arthritis (RA) treatment in Northwest China. Chemical investigation of EtOH/H2O extracts of T. ramosissima led to the discovery of a new flavonol, ramosissimin (1), together with the known flavonoids compounds quercetin (2), quercetin-3'4'-dimethylether (3) and kaempferol (4). By means of high resolution electrospray ionization mass spectroscopy (HRESIMS) and 1D and 2D-NMR experiments, and after comparison with literature data, the structures of the compounds were determined...
March 5, 2018: Die Pharmazie
C L Depoix, F Haegemann, F Debiève, C Hubinont
STUDY QUESTION: Is 8% O2 a better percentage of atmospheric oxygen for long-term cultures of human primary term cytotrophoblasts than the conventional 21% O2 traditionally used in cell culture? SUMMARY ANSWER: Human primary term cytotrophoblasts are able to differentiate into syncytiotrophoblasts under both atmospheric oxygen levels. WHAT IS KNOWN ALREADY: Cell culture is traditionally done under 21% O2, which is equal to a pO2 of ~160 mm Hg...
March 9, 2018: Molecular Human Reproduction
Puay-Wah Phuan, Guido Veit, Joseph-Anthony Tan, Ariel Roldan, Walter E Finkbeiner, Peter M Haggie, Gergely L Lukacs, Alan S Verkman
The most common cystic fibrosis-causing mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) is deletion of phenylalanine at residue 508 (∆F508). The ∆F508 mutation impairs folding of nucleotide binding domain 1 (NBD1) and interfacial interactions of NBD1 and the membrane spanning domains. Here, we report a domain-targeted screen to identify ∆F508-CFTR modulators that act on NBD1. A biochemical screen for ΔF508-NBD1 cell surface expression was done in Madin-Darby canine kidney cells expressing a chimeric reporter consisting of ΔF508-NBD1, the CD4 transmembrane domain, and an extracellular horseradish peroxidase (HRP) reporter...
March 1, 2018: SLAS Discovery
Hao Wang, William P Lustig, Jing Li
Toxic and hazardous chemical species are ubiquitous, predominantly emitted by anthropogenic activities, and pose serious risks to human health and the environment. Thus, the sensing and subsequent capture of these chemicals, especially in the gas or vapor phase, are of extreme importance. To this end, metal-organic frameworks have attracted significant interest, as their high porosity and wide tunability make them ideal for both applications. These tailorable framework materials are particularly promising for the specific sensing and capture of targeted chemicals, as they can be designed to fit a diverse range of required conditions...
March 13, 2018: Chemical Society Reviews
Wael Zakaria, A Farghali, A Moneim, N Imam, Samaa El-Dek
ZnS and their Cu doped nanoclusters (NCs) was synthesized successfully using wet chemical route with different Cu contents. The crystalline structure was investigated using X-ray powder diffraction which assured the single-phase formation in cubic symmetry. High resolution transmission electron microscope (HR-TEM) indicated the nanoclusters microstructure with size ranging from 2-4 nm. Butterfly hysteresis (M-H) loop is observed at room temperature with large values of coercivity for the Cu content of x = 0...
March 7, 2018: Nanotechnology
Yoshiki Natori, Yasutaka Kitagawa, Shogo Aoki, Rena Teramoto, Hayato Tada, Iori Era, Masayoshi Nakano
The fac -Ir(ppy)₃ complex, where ppy denotes 2-phenylpyridine, is one of the well-known luminescent metal complexes having a high quantum yield. However, there have been no specific molecular design guidelines for color tuning. For example, it is still unclear how its optical properties are changed when changing substitution groups of ligands. Therefore, in this study, differences in the electronic structures and optical properties among several substituted fac -Ir(ppy)₃ derivatives are examined in detail by density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations...
March 5, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Kazumi Sugihara
 In recent years, pharmaceuticals and personal care products (PPCPs) have emerged as significant pollutants of aquatic environments and have been detected at levels in the range of ng/L to μg/L. The source of PPCPs is humans and livestock that have been administered pharmaceuticals and subsequently excreted them via urine and feces. Unlike agricultural chemicals, the environmental dynamics of PPCPs is not examined and they would undergo structural transformation by environmental factors, e.g., sunlight, microorganisms and treatments in sewage treatment plants (STPs)...
2018: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
Himchan Cho, Joo Sung Kim, Christoph Wolf, Young-Hoon Kim, Hyung Joong Yun, Su-Hun Jeong, Aditya Sadhanala, Vijay Venugopalan, Jin Woo Choi, Chang-Lyoul Lee, Richard H Friend, Tae-Woo Lee
We have achieved high-efficiency polycrystalline perovskite light-emitting diodes (PeLEDs) based on formamidinium (FA) and cesium (Cs) mixed cations without quantum dot synthesis. Uniform single-phase FA1-x Csx PbBr3 polycrystalline films were fabricated by one-step formation with various FA:Cs molar proportions, then the influences of chemical composition on film morphology, crystal structure, photoluminescence (PL) and electroluminescence were systematically investigated. Incorporation of Cs+ cations in FAPbBr3 significantly reduced the average grain size (to 199 nm for FA:Cs = 90:10) and trap density; these changes consequently increased PL quantum efficiency (PLQE) and PL lifetime of FA1-x Csx PbBr3 films and current efficiency (CE) of PeLEDs...
March 1, 2018: ACS Nano
Mikhail Ya Goikhman, Irina A Valieva, Irina V Podeshvo, Iosif V Gofman, Ruslan Yu Smyslov, Larissa S Litvinova, Alexander V Yakimansky
A series of anthrazoline-containing monomers are synthesized, and eight co-polyamides of different chemical structures, containing 1,9-anthrazoline fragments in the main chain, are obtained and investigated. Photoluminescent, stress-strain, and thermal properties of these polymers are studied. It is shown that polymers with fragments of 4,4'-(pyrido[3,2-g]-quinoline-2,8-diyl)dianiline and 4,4'-(10-methylpyrido[3,2-g]quinoline-2,8-diyl)dianiline possess an intense luminescence in the range 550-650 nm. The performed investigations made it possible to determine the effect of substituents of various natures in the anthrazoline cycle and the position of amide group (meta- and para-configurations) on optical, stress-strain, and thermal properties of copolymers, opening up a prospect for further developments of principles of design of polymers with optimal characteristics...
March 1, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
Ryan O'Mara, Robert Hayes
In nuclear forensics or accident dosimetry, building materials such as bricks can be used to retrospectively determine radiation fields using thermoluminescence and/or optically stimulated luminescence. A major problem with brick material is that significant chemical processing is generally necessary to isolate the quartz from the brick. In this study, a simplified treatment process has been tested in an effort to lessen the processing burden for retrospective dosimetry studies. It was found that by using thermoluminescence responses, the dose deposition profile of a brick sample could be reconstructed without any chemical treatment...
April 2018: Health Physics
Albert-Manga Badiane, Stéphane Freslon, Carole Daiguebonne, Yan Suffren, Kevin Bernot, Guillaume Calvez, Karine Costuas, Magatte Camara, Olivier Guillou
Reactions in water of 4,5-dichlorophthalate (dcpa2- ) with the heaviest lanthanide ions lead to a family of compounds with the general chemical formula [Ln2 (dcpa)3 (H2 O)5 ·3H2 O]∞ , where Ln = Tb-Lu, Y. The synthesis, crystal structure, thermal behavior, and luminescent properties of this series of homonuclear compounds are described. Additionally, this family can be extended to isostructural heteronuclear compounds that can contain some light lanthanide ions and therefore present some original photophysical properties...
February 26, 2018: Inorganic Chemistry
Qingdi Zhu, Lihong Zhang, Krystyn J Van Vliet, Ali Miserez, Niels Holten-Andersen
Polymers that confer changes in optical properties in response to chemical or mechanical cues offer diverse sensing applications, particularly if this stimuli response is accessible in humid or aqueous environments. Here, luminescent hydrogels were fabricated using a facile aqueous process by incorporating lanthanide ions and carbon dots (CD) into a network of polyacrylamide and poly(acrylic acid). White luminescence was obtained by tuning the balance of blue light-emitting CD to green and red light-emitting lanthanide ions...
February 26, 2018: ACS Applied Materials & Interfaces
Si-Jia Qin, Bing Yan
Phenylamine has been recognized as one of the most important industrially relevant ingredient and a crucial intermediate in chemical products. Yet, its internal exposure detection in human remains largely elusive due to the lack of potent monitoring method. Hereby this issue is addressed with a probe based on lanthanide functionalized organic-inorganic hybrid material Al(OH)(bpydc) (1) through post-synthetically modified metal-organic framework. The as-synthesized Tb3+ @1 exhibits the strong luminescence of Tb3+ originated from efficient energy transfer from the ligand, which can sense the biological metabolite p-aminophenol (PAP) of the phenylamine in the human urine...
July 5, 2018: Analytica Chimica Acta
Dong Peng, Lei Yin, Peng Hu, Bao Li, Zhong-Wen Ouyang, Gui-Lin Zhuang, Zhenxing Wang
By utilizing a preselected functional ligand produced by 1H-imidazole-4,5-dicarboxylic acid, three isostructural lanthanide coordination polymers (CPs), denoted as {[Ln2 (OH)2 (L)2 ]·(DMF)·(H2 O)4 }n (Ln = Gd (1), Eu (2), Dy (3); L = 1-(4-carboxybenzyl)imidazole-4-carboxylic acid), containing a 1D infinite [Ln4 (OH)4 ] subchain have been successfully constructed. The highly connected mode between the multifunctional ligand and 1D building units is responsible for the exceptional chemical stability of three lanthanide CPs...
February 21, 2018: Inorganic Chemistry
K Vikrant, Daniel Cw Tsang, Nadeem Raza, Giri Balendu Shekher, Deepak Kukkar, Ki-Hyun Kim
The progress in modern agricultural practices could not have been realized without the large-scale contribution of assorted pesticides (e.g., organophosphates [OPs] and non-organophosphates [non-OPs]). Precise tracking of these chemicals has become a crucial component for safeguarding the environment and food resources owing to their very high toxicity. Hence, the development of sensitive and convenient sensors for the on-site detection of pesticides is imperative to overcome practical limitations encountered in conventional methodologies which require skilled manpower at the expense of high cost and low portability...
February 21, 2018: ACS Applied Materials & Interfaces
Qing-Yang Gu, Xiao Qiu, Jing-Jing Liu, Min Fu, Jian-Ping Chao, Rui-Jun Ju, Xue-Tao Li
Diclofenac sodium (abrr. DS) and indomethacin (abrr. IMC) have been intercalated into the layered terbium hydroxide (LTbH) by anion exchange method. Chemical compositions, thermostability, morphology, luminescence property, release behaviors and cytotoxic effects have been investigated. The DS molecules may embed between layers with a bilayered arrangement and the IMC may correspond to a monolayered arrangement. The Tb3+ luminescence in DS-LTbH and IMC-LTbH composites were enhanced compared with LTbH precusor and the luminescence intensity increases with the deprotonation degree...
August 1, 2018: Journal of Nanoscience and Nanotechnology
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