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inorganic chemistry

Jonathan Watté, Wouter Tony Mathias Van Gompel, Petra Leona Lommens, Klaartje De Buysser, Isabel Van Driessche
A method to obtain photocatalytically active thin films of anatase nanocrystals on polymer substrates was explored. Anatase nanocrystals were synthesized by a fast hydrolysis synthesis in an apolar solvent and characterized with regard to their crystallinity, size, dispersibility and stability of the resulting suspensions. The stable titania nanocrystal suspensions were further processed for their use in polar solvents using ligand exchange. Oleic acid was exchanged for 3-aminopropyltriethoxysilane (APTES), resulting in aqueous suspensions of charge-stabilized nanocrystals...
October 13, 2016: ACS Applied Materials & Interfaces
Giuseppe Meola, Henrik Braband, Paul Schmutz, Michael Benz, Bernhard Spingler, Roger Alberto
The synthesis of mono- and difunctionalized [Re(η(6)-C6H5R)(η(6)-C6H6-nRn)](+) (n = 0, 1; R = COOH, Br) complexes starting from [Re(η(6)-benzene)2](+) is described. The lithiation of [Re(η(6)-benzene)2](+) with n-BuLi leads preferentially to the neutral, alkylated product [Re(η(6)-C6H6)(η(5)-C6H6-Bu)] but not to the expected deprotonation of the arene ring. Deprotonation/lithiation with LDA gave the mono- and the dilithiated products in situ. Their reactions with 1,1,2,2-tetra-bromoethane (TBE) or with CO2, respectively, gave [Re(η(6)-C6H5Br)(η(6)-C6H6)](+), [Re(η(6)-C6H5Br)2](+), or [Re(η(6)-C6H5COOH)(η(6)-C6H6)](+), [Re(η(6)-C6H5COOH)2](+)...
October 12, 2016: Inorganic Chemistry
Constantinos G Efthymiou, Luís Cunha-Silva, Spyros P Perlepes, Euan K Brechin, Ross Inglis, Marco Evangelisti, Constantina Papatriantafyllopoulou
The use of pyridine-2-amidoxime (pyaoxH2) in Ni chemistry has provided access to a dodecanuclear complex and a hexadecanuclear Ni cluster, namely [Ni12(pyaox)6(pyaoxH)6(MeOH)2Cl2]Cl4·5MeOH (1·5MeOH) and [Ni16(pyaox)8(pyaoxH)8(MeOH)4](SO4)4·10H2O·26MeOH (2·10H2O·26MeOH). Complex 1·5MeOH was isolated by the reaction of NiCl2·6H2O, pyaoxH2 and NaOMe in a 1 : 1 : 2 molar ratio in MeOH in 60% yield. Treatment of NiSO4·6H2O with pyaoxH2 and NEt3 in a 1 : 1 : 2 molar ratio in MeOH afforded 2·10H2O·26MeOH in good yield (65%)...
October 12, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Kunfeng Chen, Dongfeng Xue
The formation of electrochemical activated cations in electrode materials to induce multiple-electron transfer reactions is a challenge for high-energy storage systems. Herein, highly electroactive Ni-based colloidal electrode materials have been synthesized by in situ electrochemical activation of a NiCl2 electrode. The highest specific capacitance of the activated Ni-based electrodes was 10 286 F g(-1) at a current density of 3 A g(-1), indicating that a three-electron Faradaic redox reaction (Ni(3+) ↔ Ni) occurred...
October 6, 2016: Nanoscale
Min-Rui Gao, Jiayin Yuan, Markus Antonietti
Ionic liquids (ILs) are new, innovative ionic solvents with rich physicochemical properties and intriguing pre-organized solvent structures, which offer great potentials to impact across versatile areas of scientific research, for example, the synthetic inorganic chemistry. Recent use of ILs as precursors, templates, and solvents has led to inorganic materials with tailored sizes, dimensionalities, morphologies and functionalities that are difficultly, or even not accessible, with conventional solvents. Poly(ionic liquid)s (PILs) polymerized from ILs monomers also raise the prospect of modifying nucleation, growth and crystallization of inorganic objects, shedding light on the synthesis of a wide range of new materials...
October 6, 2016: Chemistry: a European Journal
Meghan B Teunis, Katie N Lawrence, Poulami Dutta, Amanda P Siegel, Rajesh Sardar
Organic-inorganic hybrid perovskites, direct band-gap semiconductors, have shown tremendous promise for optoelectronic device fabrication. We report the first colloidal synthetic approach to prepare ultrasmall (∼1.5 nm diameter), white-light emitting, organic-inorganic hybrid perovskite nanoclusters. The nearly pure white-light emitting ultrasmall nanoclusters were obtained by selectively manipulating the surface chemistry (passivating ligands and surface trap-states) and controlled substitution of halide ions...
October 14, 2016: Nanoscale
Diego La Mendola, Enrico Rizzarelli
No abstract text is available yet for this article.
2016: Current Topics in Medicinal Chemistry
R Alonso-Mori, K Asa, U Bergmann, A S Brewster, R Chatterjee, J K Cooper, H M Frei, F D Fuller, E Goggins, S Gul, H Fukuzawa, D Iablonskyi, M Ibrahim, T Katayama, T Kroll, Y Kumagai, B A McClure, J Messinger, K Motomura, K Nagaya, T Nishiyama, C Saracini, Y Sato, N K Sauter, D Sokaras, T Takanashi, T Togashi, K Ueda, W W Weare, T-C Weng, M Yabashi, V K Yachandra, I D Young, A Zouni, J F Kern, J Yano
The ultra-bright femtosecond X-ray pulses provided by X-ray Free Electron Lasers (XFELs) open capabilities for studying the structure and dynamics of a wide variety of biological and inorganic systems beyond what is possible at synchrotron sources. Although the structure and chemistry at the catalytic sites have been studied intensively in both biological and inorganic systems, a full understanding of the atomic-scale chemistry requires new approaches beyond the steady state X-ray crystallography and X-ray spectroscopy at cryogenic temperatures...
September 14, 2016: Faraday Discussions
Bharath Kumar, Abhishek Chakraborty, S N Tripathi, Deepika Bhattu
Non-refractory submicron (NR-PM1) aerosols were measured during the late winter period (February-March) via an Aerodyne High Resolution Time of Flight Aerosols Mass Spectrometer (HR-ToF-AMS) along with Black Carbon (BC) and trace gasses in an industrial city, Kanpur, situated in the Gangetic Plain (GP) of India. The composition of NR-PM1 aerosols was dominated by organics (54%), followed by inorganics (36%), and BC (10%). Source apportionment via Positive Matrix Factorization (PMF) of AMS measured organic aerosols (OAs) revealed 6 factors...
October 12, 2016: Environmental Science. Processes & Impacts
Daniela M Arias-Rotondo, James K McCusker
Recently, the use of transition metal based chromophores as photo-induced single-electron transfer reagents in synthetic organic chemistry has opened up a wealth of possibilities for reinventing known reactions as well as creating new pathways to previously unattainable products. The workhorses for these efforts have been polypyridyl complexes of Ru(ii) and Ir(iii), compounds whose photophysics have been studied for decades within the inorganic community but never extensively applied to problems of interest to organic chemists...
September 21, 2016: Chemical Society Reviews
Anthony Cirri, Alexey Silakov, Lasse Jensen, Benjamin J Lear
Thiolate-protected gold nanoparticles have a rich history as model systems for understanding the physical and chemical properties of metallic nanoscale materials that, in turn, form the basis for applications in areas such as molecular electronics, photocatalytic systems, and plasmonic solar cells. It is well known that the electronic properties of gold nanoparticles can be tuned by modifying the geometry, size and dielectric surrounding of the particle. However, much less is known of how modifications to the surface chemistry modulates the electronic properties of gold nanoparticles...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Nam-Gyu Park
Since the groundbreaking report on a solid-state perovskite solar cell employing a methylammonium lead iodide-sensitized mesoporous TiO2 film and an organic hole conducting layer in 2012 by our group, the swift surge of perovskite photovoltaics opens a new paradigm in solar-cell research. As a result, ca. 1300 peer-reviewed research articles were published in 2015. In this Inorganic Chemistry Forum on Halide Perovskite, the researches with highlights of work on perovskite solar cells in my laboratory are reviewed...
October 6, 2016: Inorganic Chemistry
Alexander L Vogel, Johannes Schneider, Christina Müller-Tautges, Gavin J Phillips, Mira L Pöhlker, Diana Rose, Christoph Zuth, Ulla Makkonen, Hannele Hakola, John N Crowley, Meinrat O Andreae, Ulrich Pöschl, Thorsten Hoffmann
Aerosol hygroscopic properties were linked to its chemical composition by using complementary online mass spectrometric techniques in a comprehensive chemical characterization study at a rural mountaintop station in central Germany in August 2012. In particular, atmospheric pressure chemical ionization mass spectrometry ((-)APCI-MS) provided measurements of organic acids, organosulfates, and nitrooxy-organosulfates in the particle phase at 1 min time resolution. Offline analysis of filter samples enabled us to determine the molecular composition of signals appearing in the online (-)APCI-MS spectra...
October 6, 2016: Environmental Science & Technology
Maarten de Jong, Wei Chen, Randy Notestine, Kristin Persson, Gerbrand Ceder, Anubhav Jain, Mark Asta, Anthony Gamst
Materials scientists increasingly employ machine or statistical learning (SL) techniques to accelerate materials discovery and design. Such pursuits benefit from pooling training data across, and thus being able to generalize predictions over, k-nary compounds of diverse chemistries and structures. This work presents a SL framework that addresses challenges in materials science applications, where datasets are diverse but of modest size, and extreme values are often of interest. Our advances include the application of power or Hölder means to construct descriptors that generalize over chemistry and crystal structure, and the incorporation of multivariate local regression within a gradient boosting framework...
October 3, 2016: Scientific Reports
Zhe Feng, Ruiqing Lu, Baoling Yuan, Zhenming Zhou, Qingqing Wu, Thanh H Nguyen
MS2 inactivation by UV irradiance was investigated with the focus on how the disinfection efficacy is influenced by bacteriophage MS2 aggregation and adsorption to particles in solutions with different compositions. Kaolinite and Microcystis aeruginosa were used as model inorganic and organic particles, respectively. In the absence of model particles, MS2 aggregates formed in either 1mM NaCl at pH=3 or 50-200mM ionic strength CaCl2 solutions at pH=7 led to a decrease in the MS2 inactivation efficacy because the virions located inside the aggregate were protected from the UV irradiation...
September 22, 2016: Colloids and Surfaces. B, Biointerfaces
Bingdang Wu, Ran Yin, Guoyang Zhang, Chao Yu, Shujuan Zhang
The poor selectivity of hydroxyl radicals is a major restriction in the practical application of the UV/H2O2 process for dyeing wastewater treatment. As an alternative, the target-selective UV/acetylacetone (AA) process was found highly efficient for dye decolorization. For the proper selection and application of the two photochemical processes, the effects of water matrices, including common inorganic anions (Cl(-), SO4(2-), NO3(-), HCO3(-)), natural organic matter, metal cations (Mg(2+), Mn(2+), Cu(2+), Fe(3+), Cr(3+)), and temperature, on the photo-degradation of an azo dye, Acid Orange 7 (AO7), were systematically investigated...
November 15, 2016: Water Research
Banani Kundu, Mohamed Eltohamy, Vamsi K Yadavalli, Subhas C Kundu, Hae-Won Kim
In nature inorganic-organic building units create multifunctional hierarchical architectures. Organic silk protein is particularly attractive in this respect because of its micro-nanoscale structural blocks that are attributed to sophisticated hierarchical assembly imparting flexibility and compressibility to designed biohybrid materials. In the present study, aqueous silk fibroin is assembled to form nano/microtopography on inorganic silica surface via a facile diffusion-limited aggregation process. This process is driven by electrostatic interaction and only possible at a specified aminated surface chemistry...
October 12, 2016: ACS Applied Materials & Interfaces
Zhijie Liang, Zhiwei Zhao, Tianyi Sun, Wenxin Shi, Fuyi Cui
In this study, the spherical mesoporous silica (meso-silica MCM-41) and that inorganically modified with CuO (CuO/MCM-41 nano composite) were synthesized and characterized. It was demonstrated that CuO were successfully loaded in the synthesized nano composite CuO/MCM-41. Importantly, the loaded CuO had a significant enhancement effect on the adsorption of Crystal violet and Methylene blue. Adsorption kinetic of the tested cationic dyes in the synthesized materials fitted the pseudo-second-order kinetic model and Weber's intra-particle diffusion model well...
January 1, 2017: Journal of Colloid and Interface Science
James Barber
About 3 billion years ago an enzyme emerged which would dramatically change the chemical composition of our planet and set in motion an unprecedented explosion in biological activity. This enzyme used solar energy to power the thermodynamically and chemically demanding reaction of water splitting. In so doing it provided biology with an unlimited supply of reducing equivalents needed to convert carbon dioxide into the organic molecules of life while at the same time produced oxygen to transform our planetary atmosphere from an anaerobic to an aerobic state...
January 2016: Quarterly Reviews of Biophysics
Junran Feng, Hailong Fan, Dao-An Zha, Le Wang, Zhaoxia Jin
Recent studies demonstrated that polydopamine (PDA) coating is universal to nearly all substrates, and it endows substrates with biocompatibility, postfunctionality, and other useful properties. Surface chemistry of PDA coating is important for its postmodifications and applications. However, there is less understanding of the formation mechanism and surface functional groups of PDA layers generated in different conditions. Halloysite is a kind of clay mineral with tubular nanostructure. Water-swellable halloysite has unique reactivity...
October 11, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
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