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Chemical luminescence

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https://www.readbyqxmd.com/read/29774898/chiroptical-methods-in-a-wide-wavelength-range-for-obtaining-ln-3-complexes-with-circularly-polarized-luminescence-of-practical-interest
#1
Marcin Górecki, Luca Carpita, Lorenzo Arrico, Francesco Zinna, Lorenzo Di Bari
We studied enantiopure chiral trivalent lanthanide (Ln3+ = La3+, Sm3+, Eu3+, Gd3+, Tm3+, and Yb3+) complexes with two fluorinated achiral tris(β-diketonate) ligands (HFA = hexafluoroacetylacetonate and TTA = 2-thenoyltrifluoroacetonate), incorporating a chiral bis(oxazolinyl)pyridine (PyBox) unit as a neutral ancillary ligand, by the combined use of optical and chiroptical methods, ranging from UV to IR both in absorption and circular dichroism (CD), and including circularly polarized luminescence (CPL). Ultimately, all the spectroscopic information is integrated into a total and a chiroptical super-spectrum, which allows one to characterize a multidimensional chemical space, spanned by the different Ln3+ ions, the acidity and steric demand of the diketone and the chirality of the PyBox ligand...
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29773172/seleno-l-methionine-and-l-ascorbic-acid-differentiate-the-biological-activity-of-doxorubicin-and-its-metal-complexes-as-a-new-anticancer-drugs-candidate
#2
Marzena Matejczyk, Grzegorz Świderski, Renata Świsłocka, Stanisław Józef Rosochacki, Włodzimierz Lewandowski
The most important problems of anti-cancer therapy include the toxicity of the drugs applied to healthy cells and the multi-drug cells resistance to chemotherapeutics. One of the most commonly used anticancer drugs is doxorubicin (DOX) used to treat certain leukemias and non-Hodgkin's lymphomas, as well as bladder, breast, stomach, lung, ovarian, thyroid, multiple myeloma and other cancers. Preliminary studies showed that metal complex with DOX improve its cytostatic activity with changes in their molecular structure and distribution of electrons, resulting in a substantial change of its biological activity (including antitumor activity)...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29770424/anion-induced-3d-4f-luminescent-coordination-clusters-structural-characteristics-and-chemical-fixation-of-co-2-under-mild-conditions
#3
Ruilian Zhang, Li Wang, Cong Xu, Huan Yang, Wanmin Chen, Guoshu Gao, Weisheng Liu
Two series of anion-induced 3d-4f luminescent clusters ZnII2LnIII2L4 (LnIII = Eu3+, Tb3+, Er3+, Yb3+, Nd3+) and ZnII4LnIII2L4 (LnIII = Tb3+, Nd3+) based on μ3-OH group were synthesized and characterized. The difference in anions not only leads to significant structural changes, but also changes the luminescent properties of the 3d-4f coordination clusters. These complexes show excellent catalytic performance for CO2 conversion to obtain cyclic carbonates with wide substrate scopes and high selectivity under mild conditions...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29768855/facile-synthesis-and-characterization-of-zro%C3%A2-nanoparticles-via-modified-co-precipitation-method
#4
M Ramachandran, R Subadevi, Wei-Ren Liu, M Sivakumar
The crystalline Zirconium oxide (ZrO2) nano particles were synthesized using optimized content of Zirconium nitrate (Zr(NO3)2·3H2O) with varying KOH concentration (0.5, 1 and 1.5 M) by co-precipitation method. The thermal history of the precursor was carefully analyzed through Thermogravimetric (TG/DTA) measurement. The as prepared samples were characterized to ensure structural, functional, morphological, compositional, chemical composition and band gap by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Laser Raman, scanning electron microscopy (SEM), High resolution Transverse Electron Microscopy (HR-TEM), X-ray photo electron spectroscopy (XPS), EDX, Photo luminescence spectroscopy (PL)...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29766175/bismuth-as-a-versatile-cation-for-luminescence-in-coordination-polymers-from-bix-3-4-4-bipy-understanding-of-photophysics-by-quantum-chemical-calculations-and-structural-parallels-to-lanthanides
#5
Jens R Sorg, Tobias Wehner, Philipp R Matthes, Rebecca Sure, Stefan Grimme, Johanna Heine, Klaus Müller-Buschbaum
Coordination polymers (CPs) with bismuth(iii) as a connectivity centre have been prepared from BiX3 (X = Cl-I) and 4,4'-bipyridine (bipy) in order to implement Bi-based luminescence. The products were obtained via different synthetic routes such as solution chemistry, melt syntheses or mechanochemical reactions. Five neutral and anionic 1D-CPs are presented that show a chemical parallel to trivalent lanthanides forming isostructural or closely related 1D-CPs, of which five additional compounds are described...
May 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29763647/a-simple-cell-based-high-throughput-screening-hts-assay-for-inhibitors-of-salmonella-enterica-rna-polymerase-containing-the-general-stress-response-regulator-rpos-%C3%AF-s
#6
Javier Campos-Gomez, Jorge A Benitez
RNA polymerase containing the stress response regulator σS subunit (RpoS) plays a key role in bacterial survival in hostile environments in nature and during infection. Here we devise and validate a simple cell-based high throughput luminescence assay for this holoenzyme suitable for screening large chemical libraries in a robotic platform.
May 12, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29757601/fluorescence-detection-of-bone-microcracks-using-monophosphonated-carbon-dots
#7
Fatemeh Ostadhossein, Lily Benig, Indu Tripathi, Santosh K Misra, Dipanjan Pan
Phosphonated compounds, in particular, bis-analogs are widely applied in clinical settings for the treatment of severe bone turnovers and recently as imaging probes when conjugated with organic fluorophores. Herein, we introduce a bone seeking luminescent probe that shows high binding affinity towards bone minerals based on monophosphonated carbon dots (CDs). The spheroidal CDs tethered with PEG monophosphates are synthesized in a one pot hydrothermal method and are physico-chemically characterized where the retention of phosphonates is confirmed by 13P NMR and XPS...
May 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29756141/near-unity-thermally-activated-delayed-fluorescence-efficiency-in-three-and-four-coordinate-au-i-complexes-with-diphosphine-ligands
#8
Masahisa Osawa, Masa-Aki Aino, Takaki Nagakura, Mikio Hoshino, Yuya Tanaka, Munetaka Akita
The synthesis and photoluminescence properties of three-coordinate Au(i) complexes with rigid diphosphine ligands LMe {1,2-bis[bis(2-methylphenyl)phosphino]benzene}, LEt {1,2-bis[bis(2-ethylphenyl)phosphino]benzene}, and LiPr {1,2-bis[bis(2-isopropylphenyl)phosphino]benzene} are investigated. The LMe and LEt ligands afford two types of complexes: dinuclear complexes [μ-LMe(AuCl)2] (1d) and [μ-LEt(AuCl)2] (2d) with an Au(i)-Au(i) bond and mononuclear three-coordinate Au(i) complexes LMeAuCl (1) and LEtAuCl (2)...
May 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29742204/brazilian-bioluminescent-beetles-reflections-on-catching-glimpses-of-light-in-the-atlantic-forest-and-cerrado
#9
Etelvino J H Bechara, Cassius V Stevani
Bioluminescence - visible and cold light emission by living organisms - is a worldwide phenomenon, reported in terrestrial and marine environments since ancient times. Light emission from microorganisms, fungi, plants and animals may have arisen as an evolutionary response against oxygen toxicity and was appropriated for sexual attraction, predation, aposematism, and camouflage. Light emission results from the oxidation of a substrate, luciferin, by molecular oxygen, catalyzed by a luciferase, producing oxyluciferin in the excited singlet state, which decays to the ground state by fluorescence emission...
2018: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/29733188/the-root-causes-of-the-limited-electroluminescence-stability-of-organic-light-emitting-devices-made-by-solution-coating
#10
Yong Joo Cho, Hany Aziz
Although organic electroluminescent materials have long promised the prospect of making Organic Light Emitting Devices (OLEDs) via low-cost solution-coating techniques, the electroluminescence stability of devices made by such techniques continues to be rather limited making them unsuitable for commercialization. The root causes of the lower stability of OLEDs made by solution-coating versus the more conventional vacuum-deposition remain unknown. In this work, we investigate and compare between solution-coated and vacuum-deposited materials under prolonged excitation, using the archetypical host material 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) as a model OLED material...
May 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29725079/broadband-luminescence-in-defect-engineered-electrochemically-produced-porous-si-zno-nanostructures
#11
S Dellis, N Pliatsikas, N Kalfagiannis, O Lidor-Shalev, A Papaderakis, G Vourlias, S Sotiropoulos, D C Koutsogeorgis, Y Mastai, P Patsalas
The fabrication, by an all electrochemical process, of porous Si/ZnO nanostructures with engineered structural defects, leading to strong and broadband deep level emission from ZnO, is presented. Such nanostructures are fabricated by a combination of metal-assisted chemical etching of Si and direct current electrodeposition of ZnO. It makes the whole fabrication process low-cost, compatible with Complementary Metal-Oxide Semiconductor technology, scalable and easily industrialised. The photoluminescence spectra of the porous Si/ZnO nanostructures reveal a correlation between the lineshape, as well as the strength of the emission, with the morphology of the underlying porous Si, that control the induced defects in the ZnO...
May 3, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29708253/808-nm-triggered-optical-thermometry-based-on-up-conversion-luminescence-of-nd-3-yb-3-er-3-doped-min-2-o-4-m-ca-sr-and-ba-phosphors
#12
Xue Liu, Ting Li, Xiaoqi Zhao, Hao Suo, Zhiyu Zhang, Puju Zhao, Shuai Gao, Mu Niu
Optical thermometry based on up-conversion (UC) fluorescent intensity ratio (FIR) with 808 nm excitation is preferable in water-rich environments, and investigation of the ambiguous intrinsic influencing factors on host-dependent sensitivity is a prerequisite for the development of highly sensitive thermometry. Herein, MIn2O4:Nd3+/Yb3+/Er3+ (M = Ca, Sr, and Ba) microcrystals with low phonon energy are synthesized via a sol-gel method. Intense UC luminescence with tunable emission color from green to red is obtained by controlling the Yb3+ content, and the UC mechanisms and successive energy transfer of Nd3+ → Yb3+ → Er3+ are elaborated using lifetime measurements...
April 30, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29701653/synthesis-and-luminescent-properties-of-europium-complexes-covalently-bonded-to-hybrid-materials-based-on-mcm-41-and-poly-ionic-liquids
#13
Xiaolong Zheng, Meiyu Wang, Qiuping Li
Due to the wide potential application in the fields of sensing, lighting materials, and optical⁻electrical multifunctional devices, rare earth complex hybrid materials have been studied extensively over the past decades. A poly(ionic liquid)/mesoporous-based hybrid system which has been functionalized by the covalently linked europium complexes was reported here. Through surface modification with a coupling agent bearing an vinyl group, MCM-41 was chosen as the carrier matrix for poly(ionic liquids) (PILs) and europium compounds, and based on that, novel luminescent hybrid materials were prepared by confining the ionic liquid and europium complexes into the inorganic Si⁻O frameworks...
April 26, 2018: Materials
https://www.readbyqxmd.com/read/29677669/toxicological-interaction-of-multi-component-mixtures-to-vibrio-qinghaiensis-sp-q67-induced-by-at-least-three-components
#14
Ya-Qian Xu, Shu-Shen Liu, Ye Fan, Kai Li
It has been stated by researchers that the antibiotic polymyxin B sulfate (POL) is a key component inducing time-dependent antagonism in freshwater luminescent bacteria, Vibrio qinghaiensis sp.-Q67, exposed in the ternary mixture system of the ionic liquids, pesticide and antibiotics. However, the previous statement is limited to ternary and quaternary mixtures without considering situations such as the binary system. In order to prove the direct inducing of antagonism by POL in a more complete and systematic way, two categories of experiments (adding POL in non-antagonistic ternary system and decomposing antagonistic ternary system with POL into the binary system) have been conducted in this paper...
April 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29676899/large-hollow-cavity-luminous-nanoparticles-with-near-infrared-persistent-luminescence-and-tunable-sizes-for-tumor-afterglow-imaging-and-chemo-photodynamic-therapies
#15
Jun Wang, Jinlei Li, Jiani Yu, Hongwu Zhang, Bingbo Zhang
Persistent luminous nanoparticles (PLNPs) have been capturing increasing attention in biomedical imaging because of their long-life emission and concomitant benefits (e.g., zero-autofluorescence background, high signal-to-noise ratio). Although there are quite some synthetic methodologies to synthesize PLNPs, those for constructing functional structured PLNPs remain largely unexplored. Herein we report the design principle, synthesis route, and proof-of-concept applications of hollow structured PLNPs with near-infrared (NIR) persistent luminescence, namely afterglow, and tunable sizes for tumor afterglow imaging and chemical/photodynamic therapies...
April 20, 2018: ACS Nano
https://www.readbyqxmd.com/read/29675179/one-step-solvothermal-synthesis-of-high-emissive-amphiphilic-carbon-dots-via-rigidity-derivation
#16
Pei Zhao, Xuping Li, Glib Baryshnikov, Bin Wu, Hans Ågren, Junji Zhang, Liangliang Zhu
In nanoscience, amphiphilic carbon dots (ACDs) are of great importance due to their excellent transferability for application in biological sensing, imaging and labelling. However, facile synthetic strategies are still limited, especially for obtaining high-emissive ACDs. Since the development of a high-emissive feature is strongly desired for improving the practical resolution in vivo , here we report a chemical strategy that uses rigid molecules to straightforwardly construct amphiphilic carbon dots (ACDs) with high luminescence quantum yields (QYs)...
February 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29674647/oxygen-doped-carbon-nanotubes-for-near-infrared-fluorescent-labels-and-imaging-probes
#17
Yoko Iizumi, Masako Yudasaka, Jaeho Kim, Hajime Sakakita, Tsukasa Takeuchi, Toshiya Okazaki
Chemical modification of carbon nanotube surface can controllably modulate their optical properties. Here we report a simple and effective synthesis method of oxygen-doped single-walled carbon nanotubes (o-SWCNTs), in which a thin film of SWCNTs is just irradiated under the UV light for a few minutes in air. By using this method, the epoxide-type oxygen-adducts (ep-SWCNTs) were produced in addition to the ether-type oxygen-adducts (eth-SWCNTs). The Treated (6, 5) ep-SWCNTs show a red-shifted luminescence at ~1280 nm, which corresponds to the most transparent regions for bio-materials...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29668249/cs4pbbr6-cspbbr3-perovskite-composites-with-near-unity-luminescence-quantum-yield-large-scale-synthesis-luminescence-and-formation-mechanism-and-white-light-emitting-diode-application
#18
Yameng Chen, Yang Zhou, Qing Zhao, Junying Zhang, Ju-Ping Ma, Tong-Tong Xuan, Shao-Qiang Guo, Zi-Jun Yong, Jing Wang, Yoshihiro Kuroiwa, Chikako Moriyoshi, Hong-Tao Sun
All-inorganic perovskites have emerged as a new class of phosphor materials owing to their outstanding optical properties. Zero-dimensional inorganic perovskites, in particular the Cs4PbBr6-related systems, are inspiring intensive research owing to the high photoluminescence quantum yield (PLQY) and good stability. However, synthesizing such perovskites with high PLQYs through an enviromentally friendly, cost-effective, scalable, and high-yield approach remains challenging, and their luminescence mechanisms has been elusive...
April 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29665527/discovery-of-1-8-acridinedione-derivatives-as-novel-gcn5-inhibitors-via-high-throughput-screening
#19
Huan Xiong, Jie Han, Jun Wang, Wenchao Lu, Chen Wang, Yu Chen, Fulin Lian, Naixia Zhang, Yu-Chih Liu, Chenhua Zhang, Hong Ding, Hualiang Jiang, Wencong Lu, Cheng Luo, Bing Zhou
The general control nonrepressed protein 5 (GCN5) plays a crucial role in many biological processes. Dysregulation of GCN5 has been closely related to various human diseases, especially cancers. Hence, the exploitation of small molecules targeting GCN5 is essential for drug design and academic research. Based on the amplified luminescent proximity homogeneous assay screen methodology, we performed high throughput screening and discovered a novel GCN5 inhibitor DC_G16 with 1,8-acridinedione scaffold. Structure optimization led to the identification of a highly potent inhibitor, namely DC_G16-11 with the half-maximal inhibitory concentration (IC50 ) value of 6...
February 14, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29649110/luminescence-mechanism-of-carbon-dots-by-tailoring-functional-groups-for-sensing-fe-3-ions
#20
Jingjing Yu, Chang Liu, Kang Yuan, Zunming Lu, Yahui Cheng, Lanlan Li, Xinghua Zhang, Peng Jin, Fanbin Meng, Hui Liu
In this paper, spherical carbon dots (CDs) with distinct compositions and surface states have been successfully synthesized by a facile microwave method. From the fluorescence spectra, several characteristic luminescence features have been observed: surface amino groups are dominant in the whole emission spectra centering at 445 nm, and the fingerprint emissions relevant to the impurity levels formed by some groups related to C and N elements, including C-C/C=C (intrinsic C), C-N (graphitic N), N-containing heterocycles (pyridine N) and C=O groups, are located around 305 nm, 355 nm, 410 nm, and 500 nm, respectively...
April 12, 2018: Nanomaterials
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