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Metal Complexes

Xiaoting Zhang, Daijun Zhang, Yongkui Huang, Kai Zhang, Peili Lu
The high volume of flowback water (FW) generated during shale gas exploitation is highly saline, and contains complex organics, iron, heavy metals, and sulfate, thereby posing a significant challenge for the environmental management of the unconventional natural gas industry. Herein, the treatment of FW in a sulfur-cycle-mediated microbial fuel cell (MFC) is reported. Simultaneous removal efficiency for chemical oxygen demand (COD) and total iron from a synthetic FW was achieved, at 72 ± 7% and 90.6 ± 8...
October 8, 2018: Water Research
Zhiqiang Guo, Zhixin Ni, Hengzhen Ye, Juan Xiao, Lizhao Chen, Iain Green, Li Zhang
The embryonic state of our knowledge regarding the simultaneous uptake of trace metals via multiple routes in aquatic organisms makes it difficult to accurately assess the bioaccumulation and risk of metals. This study used cadmium (Cd) and a demersal marine fish (the yellowstripe goby) as a model system to determine tissue-specific uptake of Cd under conditions of simultaneous exposure to Cd from water, sediment and diet. A triple stable isotope tracing method was used in which each exposure route was spiked by a different stable isotope (110 Cd, 111 Cd and 113 Cd)...
October 6, 2018: Journal of Hazardous Materials
Martin Balog, Ahmed Mohamed Hassan Ibrahim, Peter Krizik, Oto Bajana, Alena Klimova, Amir Catic, Zdravko Schauperl
Metallic implant materials are biomaterials that have experienced major development over the last fifty years, yet some demands posed to them have not been addressed. For the osseointegration process and the outcome of endosseous implantation, it is crucial to reduce the stress shielding effect and achieve sufficient biocompatibility. Powder metallurgy (PM) was utilized in this study to fabricate a new type of titanium (Ti) + magnesium (Mg) bioactive composite to enable stress-shielding reduction and obtain better biocompatibility compared with that of the traditional Ti and Ti alloys used for dental implants...
October 12, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Shruti Sarode, Punita Upadhyay, M A Khosa, Tony Mak, Abdus Shakir, Sandra Song, Aman Ullah
Heavy metals have substantively high values of half-lives with nonbiodegradable chemical nature. At the same time, their ionic compounds have amazing ability of ionization in aqueous media. Remediation of such metals from wastewaters has been very complex, expensive and a challenging goal for ages. Several methods have been employed to segregate heavy metals and their corresponding anions, and organic contents from wastewaters in industries. In this review, a comparative analysis of various technologies is summarized with their working principle, advantages, and limitations followed by special focus on biosorption...
October 18, 2018: International Journal of Biological Macromolecules
Matteo Barborini, Sandro Sorella, Massimo Rontani, Stefano Corni
Angle-resolved photoemission spectroscopy allows one to visualize in momentum space the probability weight maps of electrons subtracted from molecules deposited on a substrate. The interpretation of these maps usually relies on the plane wave approximation through the Fourier transform of single particle orbitals obtained from density functional theory. Here we propose a first-principle many-body approach based on quantum Monte Carlo (QMC) to directly calculate the quasi-particle wave functions (also known as Dyson orbitals) of molecules in momentum space...
October 21, 2018: Journal of Chemical Physics
Laa-Iqa Rylands, Athi Welsh, Keletso Maepa, Tameryn Stringer, Dale Taylor, Kelly Chibale, Gregory S Smith
Benzimidazoles, such as albendazole, thiabendazole and omeprazole have antiplasmodial activity against Plasmodium falciparum and are widely used as scaffolds for metal-based drug research. Incorporating substituents with various lipophilic and electronic properties can influence trans-membrane interactions and concomitantly improve the biological activity. To study structure-activity relationships, a series of 2-phenylbenzimidazoles and their corresponding Ru(II), Ir(III) and Rh(III) cyclometallated complexes were synthesised and evaluated for antiplasmodial activity against the chloroquine-sensitive (NF54) strain of the human malaria parasite Plasmodium falciparum...
October 10, 2018: European Journal of Medicinal Chemistry
Jiawei Wen, Pengge Ning, Hongbin Cao, He Zhao, Zhi Sun, Yi Zhang
Identification the polymerization nature of vanadium bearing solution is difficult, yet it is of great environmental concern due to the possible carcinogenic effects as well as high-value sustainable necessities. Thus, seeking for simple and efficient characterization methods of tracking vanadium species is in urgent demand. In this work, high-resolution electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS) coupled with thermodynamic calculations was employed to measure vanadium-containing samples...
September 29, 2018: Journal of Hazardous Materials
Shaohua Wu, Shenglu Zhou, Haijun Bao, Dongxiang Chen, Chunhui Wang, Baojie Li, Guijie Tong, Yujie Yuan, Baogen Xu
Identifying combined pollution risk areas is difficult because of the complex pollutant sources and heterogeneous soil properties in urban systems. This study used bivariate local Moran's I to analyze the spatial interaction between heavy metals and PAHs, revealed the causes of spatial interaction patterns through PMF, and proposed a risk zoning approach for combined pollution in urban areas. The results showed that both heavy metals and PAHs had high spatial heterogeneity in urban soil. Bivariate LISA maps revealed the spatial interactions between heavy metals and PAHs...
October 2, 2018: Journal of Hazardous Materials
Hellen Franciane Gonçalves Barbosa, Éder Tadeu Gomes Cavalheiro
Influence of some reactional parameters as mol ratio (Schiff base:metal), solvent, temperature and reaction time were evaluated in order to improve the extension of complexation during the preparation of zinc complexes of biopolymeric Schiff base from chitosan and salicylaldehyde. Zinc(II) complex was used as a model system in order to improve the degree of complexation for further synthesis of different Schiff bases complexes from other aldehydes and metallic centers. The complexation yields for each synthesis were estimated on the basis of the zinc oxide formed after thermal degradation...
October 17, 2018: International Journal of Biological Macromolecules
Han Yu, Shunxi Dong, Qian Yao, Long Chen, Dong Zhang, Xiaohua Liu, Xiaoming Feng
2-Alkenoyl pyridine-bound N,N'-dioxide/TbIII complex was found to be able to absorb visible light to reach its excited state, leading to direct visible-light-excited catalytic enantioselective [2+2] cycloaddition of 2-alkenoyl pyridines with various alkenes in the absence of additional photosensitizer. Diverse enantioenriched cyclobutanes were obtained in good results (up to 70% yields, >19:1 d.r., 92% ee). The new chiral terbium(III) complex features bathochromic shift, lower excitation energy, and facile intersystem crossing due to the paramagnetic and heavy-atom effects, enabling the antenna 2-alkenoyl pyridines to be excited...
October 20, 2018: Chemistry: a European Journal
Sorcha Cronin-O'Reilly, Joe D Taylor, Ian Jermyn, A Louise Allcock, Michael Cunliffe, Mark P Johnson
One of the most common approaches for investigating the ecology of spatially complex environments is to examine a single biotic assemblage present, such as macroinvertebrates. Underlying this approach are assumptions that sampled and unsampled taxa respond similarly to environmental gradients and exhibit congruence across different sites. These assumptions were tested for five benthic groups of various sizes (archaea, bacteria, microbial eukaryotes/protists, meiofauna and macrofauna) in Plymouth Sound, a harbour with many different pollution sources...
October 19, 2018: Scientific Reports
Kathryn S Evans, Shannon C Brady, Joshua S Bloom, Robyn E Tanny, Daniel E Cook, Sarah E Giuliani, Stephen W Hippleheuser, Mostafa Zamanian, Erik C Andersen
Phenotypic complexity is caused by the contributions of environmental factors and multiple genetic loci, interacting or acting independently. Studies of yeast and Arabidopsis often find that the majority of natural variation across phenotypes is attributable to independent additive quantitative trait loci (QTL). Detected loci in these organisms explain most of the estimated heritable variation. By contrast, many heritable components underlying phenotypic variation in metazoan models remain undetected. Before the relative impacts of additive and interactive variance components on metazoan phenotypic variation can be dissected, high replication and precise phenotypic measurements are required to obtain sufficient statistical power to detect loci contributing to this missing heritability...
October 19, 2018: Genetics
Barbora Hudcová, Martina Vítková, Petr Ouředníček, Michael Komárek
Although the mechanisms of metal(loid) removal from aqueous solutions using LDHs (layered double hydroxides) and mixed oxides (thermally treated LDHs; CLDHs) have been studied, research dealing with their stability, stabilizing efficiency and remediation potential for contaminated soils remains scarce. We present a complex study investigating the stabilizing efficiency of Mg-Fe LDHs and CLDHs at different conditions, including aqueous solutions and real soils with highly elevated As(V), Pb(II) and Zn(II) concentrations...
January 15, 2019: Science of the Total Environment
Xiaoqian Liu, Na Li, Min-Min Xu, Chunhui Jiang, Jianhao Wang, Guoqiang Song, Yong Wang
A thymine moiety as ion binding accepter was introduced into asymmetric squaraine fluorophore by amide coupling reaction to develop a new thymine-squaraine based fluorescent chemosensor (SQ). Its detection ability towards heavy metal ions was investigated by UV-vis and fluorescent spectrometry. The results showed that the sensor had high selectivity towards Cd2+ over the other metal ions in aqueous media. Moreover, it was shown that the turn on fluorescence signal occurred in the present of high concentration of cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) solution which resulting in deaggregations of SQ...
October 12, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Kensuke Yotsumoto, Kenta Ishii, Miho Kokubo, Sakiko Yasuoka
Polymeric micelles, which form through the self-assembly of poly(ethylene glycol)-poly(amino acid) block copolymers, are systemic nanocarriers in targeted cancer therapy. These micelles can encapsulate therapeutic compounds, such as lipophilic substances, charged compounds, and metal complexes, that have characteristics of increased solubility, sustained release, and improved tissue distribution. However, few studies have been conducted on the local distribution of polymeric micelles. Thus, we evaluated the skin penetration pattern of hydrophobic drugs in polymeric micelles...
October 16, 2018: International Journal of Pharmaceutics
Lele Yao, Donghui Li, Lingling Liu
For the full-bridge LLC converter, it is necessary to establish a large signal model with low-complexity and high-precision when the current of filter inductor works under the continuous conduction mode (CCM) situation. In terms of low complexity, peak values of resonant state variables and average values of slow state variables are taken as the measured indexes between models and actual converter. Models based on the first harmonic approximation (FHA) are studied in depth because they have lower complexity than the existing models...
2018: PloS One
Gennaro Pescitelli, Steffen Lüdeke, Anne-Christine Chamayou, Marija Marolt, Viktor Justus, Marcin Górecki, Lorenzo Arrico, Lorenzo Di Bari, Mohammad Ariful Islam, Irina Gruber, Mohammed Enamullah, Christoph Janiak
Chiroptical broad-range spectral analysis extending from UV to mid-IR was employed to study a family of Co(II) N-(1-(aryl)ethyl)salicylaldiminato Schiff base complexes with pseudotetrahedral geometry associated with chirality-at-metal of the Δ/Λ type. While common chiral organic compounds have well-separated absorption and circular dichroism spectra (CD) in the UV/vis and IR regions, chiral Co(II) complexes feature an almost unique continuum of absorption and CD bands, which cover in sequence the UV, visible, near-IR (NIR), and IR regions of the electromagnetic spectrum...
October 19, 2018: Inorganic Chemistry
Yuxiang Chen, M Lisa Phipps, James H Werner, Saumen Chakraborty, Jennifer S Martinez
Metal nanoclusters containing a few to several hundred atoms with sizes ranging from sub-nanometer to ∼2 nm occupy an intermediate size regime that bridges larger plasmonic nanoparticles and smaller metal complexes. With strong quantum confinement, metal nanoclusters exhibit molecule-like properties. This Account focuses on noble metal nanoclusters that are synthesized within a single stranded DNA template. Compared to other ligand protected metal nanoclusters, DNA-templated metal nanoclusters manifest intriguing physical and chemical properties that are heavily influenced by the design of DNA templates...
October 19, 2018: Accounts of Chemical Research
Dmytro Havrylyuk, Megha Deshpande, Sean Parkin, Edith C Glazer
Coordination complexes can be used to photocage biologically active ligands, providing control over the location, time, and dose of a delivered drug. Dual action agents can be created if both the ligand released and the ligand-deficient metal center effect biological processes. Ruthenium(ii) complexes coordinated to pyridyl ligands generally are only capable of releasing one ligand in H2O, wasting equivalents of drug molecules, and producing a Ru(ii) center that is not cytotoxic. In contrast, Ru(ii) polypyridyl complexes containing diazine ligands eject both monodentate ligands, with the quantum yield (φPS) of the second phase varying as a function of ligand pKa and the pH of the medium...
October 19, 2018: Chemical Communications: Chem Comm
Heather Lam, Zafar Qureshi, Marcus Wegmann, Mark Lautens
Cycloadditions are powerful processes to synthesize complex polycyclic scaffolds. Herein, we disclose a [4+3]-cycloaddition between an in situ generated ortho-quinone methide and an isomünchnone to yield oxa-bridged oxazocine cores, generating N2 and H2O as the sole by-products. Using only catalytic amounts of camphorsulfonic acid, it is possible to generate both reactive intermediates in one step, eliminating the need for rhodium catalysts generally employed for isomünchnone formation. Spectroscopic data and X-ray crystallography indicate the formation of the syn diastereomer, with the main side-product arising from a hydrate participating in a competing [4+2]-cycloaddition pathway...
October 19, 2018: Angewandte Chemie
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