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inorganic chemistry

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https://www.readbyqxmd.com/read/28432500/walking-over-4-gya-chemical-evolution-from-photochemistry-to-mineral-and-organic-chemistries-leading-to-an-rna-world
#1
REVIEW
Kunio Kawamura, Marie-Christine Maurel
Here we overview the chemical evolution of RNA molecules from inorganic material through mineral-mediated RNA formation compatible with the plausible early Earth environments. Pathways from the gas-phase reaction to the formation of nucleotides, activation and oligomerization of nucleotides, seem to be compatible with specific environments. However, how these steps interacted is not clear since the chemical conditions are frequently different and can be incompatible between them; thus the products would have migrated from one place to another, suitable for further chemical evolution...
April 21, 2017: Origins of Life and Evolution of the Biosphere
https://www.readbyqxmd.com/read/28429494/a-modular-approach-to-inorganic-phosphazane-macrocycles
#2
Alex J Plajer, Raúl García-Rodríguez, Callum G M Benson, Peter D Matthews, Andrew D Bond, Sanjay Singh, Lutz H Gade, Dominic S Wright
Inorganic macrocycles, based on non-carbon backbones, present exciting synthetic challenges in the systematic assembly of inorganic molecules, as well as new avenues in host-guest and supramolecular chemistry. Here we demonstrate a new high-yielding modular approach to a broad range of trimeric and hexameric S- and Se-bridged inorganic macrocycles based on cyclophosphazane frameworks, using the building blocks [S=(H)P(μ-NR)]2 . The method involves the in situ generation of the key intermediate [E....._ (S...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28429029/derivatization-and-interlaminar-debonding-of-graphite-iron-nanoparticle-hybrid-interfaces-using-fenton-chemistry
#3
Neha Agarwal, Ruma Bhattacharyya, Narendra K Tripathi, Sanjay Kanojia, Debmalya Roy, Kingsuk Mukhopadhyay, Namburi Eswara Prasad
The interfacial debonding of graphite lattices using iron (Fe) nanoparticles and Fenton's reagent is reported, towards the scalable production of few-layer graphene flakes. Acoustic cavitation via a sonochemical route was adapted to produce iron and iron oxide nanoparticles in the graphite matrix. The oxygenated species were introduced into the graphite lattice using a physical method, and then Fenton chemistry was utilized to generate localized hydroxyl radicals at the Fe nanoparticle-graphite interfaces for zipping and self-exfoliation of the defected graphite lattices...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28426208/global-and-local-partitioning-of-the-charge-transferred-in-the-parr-pearson-model
#4
Angel Ulises Orozco-Valencia, José Luis Gázquez, Alberto Vela
Through a simple proposal, the charge transfer obtained from the cornerstone theory of Parr and Pearson is partitioned, for each reactant, in two channels: an electrophilic, through which the species accepts electrons, and the other, a nucleophilic, where the species donates electrons. It is shown that this global model allows us to determine unambiguously the charge transfer mechanism prevailing in a given reaction. The partitioning is extended to include local effects through the Fukui functions of the reactants...
April 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28414229/coding-the-assembly-of-polyoxotungstates-with-a-programmable-reaction-system
#5
Andreu Ruiz de la Oliva, Victor Sans, Haralampos N Miras, De-Liang Long, Leroy Cronin
Chemical transformations are normally conducted in batch or flow mode, thereby allowing the chemistry to be temporally or spatially controlled, but these approaches are not normally combined dynamically. However, the investigation of the underlying chemistry masked by the self-assembly processes that often occur in one-pot reactions and exploitation of the potential of complex chemical systems requires control in both time and space. Additionally, maintaining the intermediate constituents of a self-assembled system "off equilibrium" and utilizing them dynamically at specific time intervals provide access to building blocks that cannot coexist under one-pot conditions and ultimately to the formation of new clusters...
April 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28391688/total-as-and-as-speciation-in-italian-rice-as-related-to-producing-areas-and-paddy-soils-properties
#6
Daniele Tenni, Maria Martin, Elisabetta Barberis, Gian Maria Beone, Eleonora Miniotti, Marcella Sodano, Elena Zanzo, Maria Chiara Fontanella, Marco Romani
Rice and rice-based foodstuffs are important pathways for inorganic As dietary intake. This work shows a detailed picture of As content and speciation in Italian rice, which contributes to more than one half of European production, and addresses the role of soil chemistry and agronomic management on As concentration in rice grain, in view of ameliorative strategies. The mean total As content in Italian white rice was 155±65 µg kg-1 with significant differences among producing areas, while the mean inorganic As was 102±26 µg kg-1, largely below the E...
April 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28388189/strong-coupling-between-surface-plasmon-polaritons-and-molecular-vibrations
#7
H Memmi, O Benson, S Sadofev, S Kalusniak
We report on the strong coupling of surface plasmon polaritons and molecular vibrations in an organic-inorganic plasmonic hybrid structure consisting of a ketone-based polymer deposited on top of a silver layer. Attenuated-total-reflection spectra of the hybrid reveal an anticrossing in the dispersion relation in the vicinity of the carbonyl stretch vibration of the polymer with an energy splitting of the upper and lower polariton branch up to 15 meV. The splitting is found to depend on the molecular layer thickness and saturates for micrometer-thick films...
March 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28378591/semiconductor-photocatalysis-for-chemoselective-radical-coupling-reactions
#8
Horst Kisch
Photocatalysis at semiconductor surfaces is a growing field of general photocatalysis because of its importance for the chemical utilization of solar energy. By analogy with photoelectrochemistry the basic mechanism of semiconductor photocatalysis can be broken down into three steps: photogenerated formation of surface redox centers (electron-hole pairs), interfacial electron transfer from and to substrates (often coupled with proton-transfer), and conversion of primary redox intermediates into the products...
April 5, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28376395/temporal-and-spatial-variation-in-major-ion-chemistry-and-source-identification-of-secondary-inorganic-aerosols-in-northern-zhejiang-province-china
#9
Jing-Sha Xu, Meng-Xia Xu, Colin Snape, Jun He, Sailesh N Behera, Hong-Hui Xu, Dong-Sheng Ji, Cheng-Jun Wang, Huan Yu, Hang Xiao, Yu-Jun Jiang, Bing Qi, Rong-Guang Du
To investigate the seasonal and spatial variations of ion chemistry of fine particles in Northern Zhejiang Province (NZP), China, one year-long field sampling was conducted at four representative sites (two urban, one suburb, and one rural sites) in both cities of Hangzhou and Ningbo from December 2014 to November 2015. Twelve water soluble inorganic ions (WSII) were characterized in this comprehensive study. The annual average of PM2.5 concentration in NZP as overall was 66.2 ± 37.7 μg m(-3), and urban sites in NZP were observed with more severe PM2...
March 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28375004/transferable-aspherical-atom-modeling-of-electron-density-in-highly-symmetric-crystals-a-case-study-of-alkali-metal-nitrates
#10
Yulia V Nelyubina, Alexander A Korlyukov, Konstantin A Lyssenko, Ivan V Fedyanin
A comparative electron density study (from X-ray diffraction and periodic quantum chemistry) of sodium and potassium nitrates is performed to test the performance of a transferrable aspherical atom model, which is based on the invarioms, to describe chemical bonding features of ions occurring in sites of different symmetry typical of inorganic salts and in different crystal environments. Relying on tabulated entries for the isolated ions (although tailor-made to account for different site symmetries), it takes the same time to employ as the spherical atom model routinely used in X-ray diffraction studies but provides an electron density distribution that faithfully reveals all the interionic interactions-even the weakest ones (such as between the nitrate anions or a K···N interaction found in the metastable form of KNO3) yet important for properties of inorganic materials-as if obtained from high-resolution X-ray diffraction data...
April 4, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28358072/inorganic-chemistry-making-iron-glow
#11
Felix N Castellano
No abstract text is available yet for this article.
March 29, 2017: Nature
https://www.readbyqxmd.com/read/28351644/silica-and-germania-based-dual-ligand-sol-gel-organic-inorganic-hybrid-sorbents-combining-superhydrophobicity-and-%C3%AF-%C3%AF-interaction-the-role-of-inorganic-substrate-in-sol-gel-capillary-microextraction
#12
Emre Seyyal, Abdul Malik
Principles of sol-gel chemistry were utilized to create silica- and germania-based dual-ligand surface-bonded sol-gel coatings providing enhanced performance in capillary microextraction (CME) through a combination of ligand superhydrophobicity and π-π interaction. These organic-inorganic hybrid coatings were prepared using sol-gel precursors with bonded perfluorododecyl (PF-C12) and phenethyl (PhE) ligands. Here, the ability of the PF-C12 ligand to provide enhanced hydrophobic interaction was advantageously combined with π-π interaction capability of the PhE moiety to attain the desired sorbent performance in CME...
April 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28351008/aerosol-characteristics-and-sources-in-yangzhou-china-resolved-by-offline-aerosol-mass-spectrometry-and-other-techniques
#13
Xinlei Ge, Ling Li, Yanfang Chen, Hui Chen, Dan Wu, Junfeng Wang, Xinchun Xie, Shun Ge, Zhaolian Ye, Jianzhong Xu, Mindong Chen
Detailed chemical characterization of fine aerosols (PM2.5) is important for reducing air pollution in densely populated areas, such as the Yangtze River Delta region in China. This study systematically analyzed PM2.5 samples collected during November 2015 to April 2016 in urban Yangzhou using a suite of techniques, in particular, an Aerodyne soot particle aerosol mass spectrometry (SP-AMS). The techniques used here reconstructed the majority of total PM2.5 measured where extracted species comprised on average 91...
March 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28345888/influence-of-ring-strain-and-bond-polarization-on-the-ring-expansion-of-phosphorus-homocycles
#14
Saurabh S Chitnis, Rebecca A Musgrave, Hazel A Sparkes, Natalie E Pridmore, Vincent T Annibale, Ian Manners
Heterolytic cleavage of homoatomic bonds is a challenge, as it requires separation of opposite charges. Even highly strained homoatomic rings (e.g., cyclopropane and cyclobutane) are kinetically stable and do not react with nucleophiles or electrophiles. In contrast, cycloalkanes bearing electron-donating/withdrawing substituents on adjacent carbons have polarized C-C bonds and undergo numerous heterolytic ring-opening and expansion reactions. Here we show that upon electrophile activation phosphorus homocycles exhibit analogous reactivity, which is modulated by the amount of ring strain and extent of bond polarization...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28337906/fates-of-chemical-elements-in-biomass-during-its-pyrolysis
#15
Wu-Jun Liu, Wen-Wei Li, Hong Jiang, Han-Qing Yu
Biomass is increasingly perceived as a renewable resource rather than as an organic solid waste today, as it can be converted to various chemicals, biofuels, and solid biochar using modern processes. In the past few years, pyrolysis has attracted growing interest as a promising versatile platform to convert biomass into valuable resources. However, an efficient and selective conversion process is still difficult to be realized due to the complex nature of biomass, which usually makes the products complicated...
March 24, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28323358/rediscovering-the-crystal-chemistry-of-borides
#16
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
#17
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
#18
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...
July 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28303719/pentanuclear-lanthanide-mono-organophosphates-synthesis-structure-and-magnetism
#19
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...
April 3, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28301760/metal-free-motifs-for-solar-fuel-applications
#20
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
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