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https://www.readbyqxmd.com/read/28323358/rediscovering-the-crystal-chemistry-of-borides
#1
REVIEW
Georgiy Akopov, Michael T Yeung, Richard B Kaner
For decades, borides have been primarily studied as crystallographic oddities. With such a wide variety of structures (a quick survey of the Inorganic Crystal Structure Database counts 1253 entries for binary boron compounds!), it is surprising that the applications of borides have been quite limited despite a great deal of fundamental research. If anything, the rich crystal chemistry found in borides could well provide the right tool for almost any application. The interplay between metals and the boron results in even more varied material's properties, many of which can be tuned via chemistry...
March 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28318243/three-unique-barium-manganese-vanadates-from-high-temperature-hydrothermal-brines
#2
Tiffany M Smith Pellizzeri, Colin D McMillen, Yimei Wen, George Chumanov, Joseph W Kolis
Three new barium manganese vanadates, all containing hexagonal barium chloride layers interpenetrated by [V2O7](4-) groups, were synthesized using a high-temperature (580 °C) hydrothermal method. Two of the compounds were prepared from a mixed BaCl2/Ba(OH)2 mineralizer, and the third compound was prepared from BaCl2 mineralizer. An interesting structural similarity exists between two of the compounds, Ba2Mn(V2O7)(OH)Cl and Ba4Mn2(V2O7)(VO4)2O(OH)Cl. These two compounds crystallize in the orthorhombic space group Pnma, Z = 4, and are structurally related by a nearly doubled a axis...
March 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28314145/preparation-of-polyhedral-oligomeric-silsesquioxane-based-cross-linked-inorganic-organic-nanohybrid-as-adsorbent-for-selective-removal-of-acidic-dyes-from-aqueous-solution
#3
Jiawei Liu, Heng Yu, Qingmei Liang, Yanna Liu, Jiwei Shen, Quan Bai
A cross-linked polyhedral oligomeric silsesquioxane (POSS) nanohybrid is synthesized through Schiff base chemistry by using octa-amino POSS as building blocks and glutaraldehyde as dual functional reagent. The obtained nanohybrid is characterized by FT-IR, solid-state (29)Si NMR, SEM, TEM, TGA and N2 adsorption-desorption isotherm, and the results demonstrate the successful cross-linkage between POSS molecules, forming block-like irregular nanoparticles with a specific surface area of 42.8m(2)g(-1). As a novel solid-phase adsorbent, cross-linked POSS nanohybrid exhibits selective adsorption properties for acidic dyes, i...
March 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28303719/pentanuclear-lanthanide-mono-organophosphates-synthesis-structure-and-magnetism
#4
Sandeep K Gupta, Stuart K Langley, Kamna Sharma, Keith S Murray, Ramaswamy Murugavel
Research on rare-earth phosphates has recently received substantial interest because of their unique physical and chemical properties. In recent years, because of their low solubility, research interest has been built on developing methodologies to prepare nanostructures and grow single crystals of inorganic rare-earth phosphates. The chemistry of rare-earth organophosphates, however, is still at a latent stage. Contrary to the traditional hydrothermal route, we report rare examples of discrete pentanuclear lanthanide(III) organophosphate clusters assembled from a sterically encumbered monoester of phosphoric acid under mild reaction conditions...
March 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28301760/metal-free-motifs-for-solar-fuel-applications
#5
Stefan Ilic, Marija R Zoric, Usha Pandey Kadel, Yunjing Huang, Ksenija D Glusac
Metal-free motifs, such as graphitic carbon nitride, conjugated polymers, and doped nanostructures, are emerging as a new class of Earth-abundant materials for solar fuel devices. Although these metal-free structures show great potential, detailed mechanistic understanding of their performance remains limited. Here, we review important experimental and theoretical findings relevant to the role of metal-free motifs as either photoelectrodes or electrocatalysts. First, the light-harvesting characteristics of metal-free photoelectrodes (band energetics, exciton binding energies, charge carrier mobilities and lifetimes) are discussed and contrasted with those in traditional inorganic semiconductors (such as Si)...
March 15, 2017: Annual Review of Physical Chemistry
https://www.readbyqxmd.com/read/28298908/serpentinization-influenced-groundwater-harbors-extremely-low-diversity-microbial-communities-adapted-to-high-ph
#6
Katrina I Twing, William J Brazelton, Michael D Y Kubo, Alex J Hyer, Dawn Cardace, Tori M Hoehler, Tom M McCollom, Matthew O Schrenk
Serpentinization is a widespread geochemical process associated with aqueous alteration of ultramafic rocks that produces abundant reductants (H2 and CH4) for life to exploit, but also potentially challenging conditions, including high pH, limited availability of terminal electron acceptors, and low concentrations of inorganic carbon. As a consequence, past studies of serpentinites have reported low cellular abundances and limited microbial diversity. Establishment of the Coast Range Ophiolite Microbial Observatory (California, U...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28293829/plant-growth-in-amended-molybdenum-mine-waste-rock
#7
Owen T Burney, Edward F Redente, Charles E Lambert
This greenhouse study examined the use of organic and inorganic soil amendments in waste rock material from the former Questa Molybdenum Mine in northern New Mexico to promote beneficial soil properties. Waste rock material was amended with 11 soil amendment treatments that included municipal composted biosolids, Biosol®, inorganic fertilizer, and two controls (pure waste rock and sand). Elymus trachycaulus and Robinia neomexicana growth performance and plant chemistry were assessed across all treatments over a period of 99 and 141 days, respectively...
March 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28288893/redox-responsive-theranostic-nanoplatforms-based-on-inorganic-nanomaterials
#8
Lu Han, Xiao-Yong Zhang, Yu-Long Wang, Xi Li, Xiao-Hong Yang, Min Huang, Kun Hu, Lu-Hai Li, Yen Wei
Spurred on by advances in materials chemistry and nanotechnology, scientists have developed many novel nanopreparations for cancer diagnosis and therapy. To treat complex malignant tumors effectively, multifunctional nanomedicines with targeting ability, imaging properties and controlled drug release behavior should be designed and exploited. The therapeutic efficiency of loaded drugs can be dramatically improved using redox-responsive nanoplatforms which can sense the differences in the redox status of tumor tissues and healthy ones...
March 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28288212/direct-experimental-probing-and-theoretical-analysis-of-the-reaction-between-the-simplest-criegee-intermediate-ch2oo-and-isoprene
#9
Z C J Decker, K Au, L Vereecken, L Sheps
Recent advances in the spectroscopy of Criegee intermediates (CI) have enabled direct kinetic studies of these highly reactive chemical species. The impact of CI chemistry is currently being incorporated into atmospheric models, including their reactions with trace organic and inorganic compounds. Isoprene, C5H8, is a doubly-unsaturated hydrocarbon that accounts for the largest share of all biogenic emissions around the globe and is also a building block of larger volatile organic compounds. We report direct measurements of the reaction of the simplest CI (CH2OO) with isoprene, using time-resolved cavity-enhanced UV absorption spectroscopy...
March 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28285858/high-resolution-profile-of-inorganic-aqueous-geochemistry-and-key-redox-zones-in-an-arsenic-bearing-aquifer-in-cambodia
#10
Laura A Richards, Daniel Magnone, Chansopheaktra Sovann, Chivuth Kong, Sebastian Uhlemann, Oliver Kuras, Bart E van Dongen, Christopher J Ballentine, David A Polya
Arsenic contamination of groundwaters in South and Southeast Asia is a major threat to public health. In order to better understand the geochemical controls on the mobility of arsenic in a heavily arsenic-affected aquifer in northern Kandal Province, Cambodia, key changes in inorganic aqueous geochemistry have been monitored at high vertical and lateral resolution along dominant groundwater flow paths along two distinct transects. The two transects are characterized by differing geochemical, hydrological and lithological conditions...
March 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28277654/discovery-synthesis-design-and-prediction-of-chalcogenide-phases
#11
Mercouri G Kanatzidis
The discovery of new materials and their efficient syntheses is a fundamental goal of chemistry. A related objective is to identify foundational and rational approaches to enhance the art of synthesis by combining the exquisite predictability of organic synthesis with the high yields of solid-state chemistry. In contrast to so-called solid-state methods, inorganic syntheses in liquid fluxes permit bond formation, framework assembly, and crystallization at lower temperatures because of facile diffusion and chemical reactions with and within the flux itself...
March 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28273907/hybrid-inorganic-organic-capsules-for-efficient-intracellular-delivery-of-novel-sirnas-against-influenza-a-h1n1-virus-infection
#12
Alexander S Timin, Albert R Muslimov, Aleksandra V Petrova, Kirill V Lepik, Maria V Okilova, Andrey V Vasin, Boris V Afanasyev, Gleb B Sukhorukov
The implementation of RNAi technology into the clinical practice has been significantly postponing due to the issues regarding to the delivery of naked siRNA predominantly to target cells. Here we report the approach to enhance the efficiency of siRNA delivery by encapsulating the siRNA into new carrier systems which are obtained via the combination of widely used layer-by-layer technique and in situ modification by sol-gel chemistry. We used three types of siRNAs (NP-717, NP-1155 and NP-1496) in encapsulated form as new therapeutic agents against H1N1 influenza virus infection...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28273533/effects-of-polyphosphates-and-orthophosphate-on-the-dissolution-and-transformation-of-zno-nanoparticles
#13
Biao Wan, Yupeng Yan, Yuanzhi Tang, Yuge Bai, Fan Liu, Wenfeng Tan, Qiaoyun Huang, Xionghan Feng
The fate and toxicity of zinc oxide nanoparticles (ZnO NPs) in nature are affected by solution chemistry such as pH, anions, and natural organic matter (NOM). Inorganic polyphosphates are environmentally ubiquitous phosphorus (P) species that may change the speciation and environmental fate of ZnO NPs. In this study, the interactions of polyphosphates with ZnO NPs and the impacts on ZnO NP dissolution and transformation were investigated and compared with orthophosphate (P1). The results revealed that pyrophosphate (P2), tripolyphosphate (P3), and hexametaphosphate (P6) enhanced whereas P1 inhibited the dissolution of ZnO NPs...
February 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28267340/the-mechanism-of-hydrogen-bonded-complex-formation-between-ibuprofen-and-nanocrystalline-hydroxyapatite
#14
Yulia Ryabenkova, Niten Jadav, Marco Conte, Michael F A Hippler, Nik Reeves-McLaren, Phil D Coates, Peter Twigg, Anant Paradkar
Nanocrystalline hydroxyapatite (nanoHA) is the main hard component of bone and has potential to be used to promote osseointegration of implants and to treat bone defects. Here, using active pharmaceutical ingredients (APIs) like ibuprofen, we report on the prospects of combining nanoHA with biologically active compounds to improve the clinical performance of these treatments. In this study we designed and investigated the possibility of API attachment to the surface of nano-HA crystals via the formation of a hydrogen-bonded complex...
March 7, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28264159/streamlined-synthesis-and-assembly-of-a-hybrid-sensing-architecture-with-solid-binding-proteins-and-click-chemistry
#15
Brian J F Swift, Jared A Shadish, Cole A DeForest, François Baneyx
Combining bioorthogonal chemistry with the use of proteins engineered with adhesive and morphogenetic solid-binding peptides is a promising route for synthesizing hybrid materials with the economy and efficiency of living systems. Using optical sensing of chloramphenicol as a proof of concept, we show here that a GFP variant engineered with zinc sulfide and silica-binding peptides on opposite sides of its β-barrel supports the fabrication of protein-capped ZnS:Mn nanocrystals that exhibit the combined emission signatures of organic and inorganic fluorophores...
March 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28257024/structure-of-a-pentamanganese-ii-phenoxide-cluster-with-a-central-five-coordinate-oxide-mn-ii-5-%C3%AE-oph-6-%C3%AE-3-oph-2-%C3%AE-5-o-py-6%C3%A2-py-py-is-pyridine
#16
Clifton R Hamilton, Michael J Zdilla
Polynuclear metal clusters frequently feature geometric structural features not common in traditional coordination chemistry. These structures are of particular interest to bioinorganic chemists studying metallocluster enzymes, which frequently possess remarkably unusual inorganic structures. The structure of the manganese cluster μ5-oxido-di-μ3-phenoxido-hexa-μ-phenoxido-hexakis(pyridine-κN)hexamanganese(II) pyridine monosolvate, [Mn5(C6H5O)8O(C5H5N)6]·C5H5N or Mn(II)5(μ-OPh)6(μ3-OPh)2(μ5-O)(Py)6·Py, containing an unusual trigonal bipyramidal central oxide, is described...
March 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/28252973/dna-with-ionic-atomic-and-clustered-silver-an-xps-study
#17
Ivan L Volkov, Anastasiya Smirnova, Anna A Makarova, Zakhar V Reveguk, Ruslan R Ramazanov, Dmitry Yu Usachov, Vera K Adamchuk, Alexei I Kononov
The rapidly developing field of bionanotechnology requires detailed knowledge of the mechanisms of interaction between inorganic matter and biomolecules. Under conditions different from those in an aqueous solution, however, the chemistry of these systems is elusive and may differ dramatically from their interactions in vitro and in vivo. Here, we report for the first time a photoemission study of a metal silver-DNA interface, formed in vacuo, in comparison with DNA-Ag(+) and fluorescent DNA-Ag complexes formed in solution...
March 13, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28251566/fluorescence-sensing-of-inorganic-phosphate-and-pyrophosphate-using-small-molecular-sensors-and-their-applications
#18
REVIEW
Jirarut Wongkongkatep, Akio Ojida, Itaru Hamachi
The aim of this contribution is to provide an introduction and a brief summary of the principle of fluorescence molecular sensors specific to inorganic phosphate (Pi) and inorganic pyrophosphate (PPi) as well as their applications. In our introduction we describe the impact of both Pi and PPi in the living organism and in the environment, followed by a description of the principle of fluorescence molecular sensors and the sensing mechanism in solution. We then focus on exciting research which has emerged in recent years on the development of fluorescent sensors specific to Pi and PPi, categorized by chemical interactions between the sensor and the target molecule, such as hydrogen bonding, coordination chemistry, displacement assay, aggregation induced emission or quenching, and chemical reactions...
April 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28247884/rational-design-of-super-alkalis-and-their-role-in-co2-activation
#19
Tianshan Zhao, Qian Wang, Puru Jena
Super-alkalis are clusters of atoms. With ionization potentials smaller than those of the alkali atoms, they are playing an increasing role in chemistry as highlighted by recent applications in solar cells as well as in Li-ion batteries. For the past 40 years superalkalis were designed using inorganic elements with the sp orbital character. Here, we show that a large class of superalkalis composed of only simple metal atoms, transition metal complexes as well as organic molecules can be designed by making use of electron counting rules beyond the octet rule...
March 1, 2017: Nanoscale
https://www.readbyqxmd.com/read/28247489/inorganic-snip-type-double-helices-in-main-group-chemistry
#20
Maximilian Baumgartner, Richard Weihrich, Tom Nilges
Inspired by the synthesis of the first atomic-scale double helix semiconductor SnIP this study deals with the question if more atomistic, inorganic double helix compounds are accessible. With the aid of quantum chemical calculations we have identified 31 candidates by a homoatomic substitution in MXPn, varying the group 4 M-element from Si to Pb, the group 7 X-element from F to I and replacing the pnictide (Pn) phosphorus by arsenic. The double-helical structure of SnIP has been used as the starting model for all candidates and the electronic structure and vibrational spectra were determined within the Framework of Density Functional Theory (DFT)...
March 1, 2017: Chemistry: a European Journal
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