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inorganic chemistry

Xiang Zhao, Edward T Nguyen, Anh N Hong, Pingyun Feng, Xianhui Bu
Homochiral metal-organic frameworks (MOFs) are an important class of chiral solids with potential applications in chiral recognition; however, relatively few are available. Of great importance is the availability of low-cost, racemization-resistant, and versatile enantiopure building blocks. Among chiral building blocks, d-camphoric acid is highly prolific, yet, its trans-isomer, l-isocamphoric acid, has remained unknown in the entire field of solid-state materials. Its rich yet totally untapped synthetic and structural chemistry has now been investigated through the synthesis of a large family of homochiral metal isocamphorates...
May 17, 2018: Angewandte Chemie
Leonard Bezinge, Richard M Maceiczyk, Ioannis Lignos, Maksym V Kovalenko, Andrew J deMello
Recent advances in the development of hybrid organic-inorganic lead halide perovskite (LHP) nanocrystals (NCs) have demonstrated their versatility and potential application as photovoltaics and light emitters through compositional tuning of optical properties. That said, due to their compositional complexity, the targeted synthesis of mixed-cation, mixed-halide LHP NCs still represents an immense challenge for traditional batch scale chemistry. To address this limitation, we herein report the integration of a high-throughput segmented-flow microfluidic reactor and self-optimizing algorithm for the synthesis of nanocrystals with defined emission properties...
May 16, 2018: ACS Applied Materials & Interfaces
Brech Aikman, Andreia de Almeida, Samuel M Meier-Menches, Angela Casini
Aquaporins (AQPs) are membrane proteins allowing permeation of water, glycerol & hydrogen peroxide across biomembranes, and playing an important role in water homeostasis in different organs, exocrine gland secretion, urine concentration, skin moisturization, fat metabolism and neural signal transduction. Notably, a large number of studies showed that AQPs are closely associated with cancer biological functions and expressed in more than 20 human cancer cell types. Furthermore, AQP expression is positively correlated with tumour types, grades, proliferation, migration, angiogenesis, as well as tumour-associated oedema, rendering these membrane channels attractive as both diagnostic and therapeutic targets in cancer...
May 16, 2018: Metallomics: Integrated Biometal Science
Lianfang Wei, Siyao Yue, Wanyu Zhao, Wenyi Yang, Yingjie Zhang, Lujie Ren, Xiaokun Han, Qingjun Guo, Yele Sun, Zifa Wang, Pingqing Fu
Pervasive particulate pollution has been observed over large areas of the North China Plain. The high level of sulfate, a major component in fine particles, is pronounced during heavy pollution periods. Being different from source apportionments by atmospheric chemistry-transport model and receptor modeling methods, here we utilize sulfur isotopes to discern the potential emission sources. Sixty-five daily PM2.5 samples were collected at an urban site in Beijing between September 2013 and July 2014. Inorganic ions, organic/elemental carbon and stable sulfur isotopes of sulfate were analyzed...
August 15, 2018: Science of the Total Environment
Chenglin Yan, Xianfu Wang, Yiming Xie, Kai Tang, Chao Wang
Hydrogen ions are ideal charge carriers for rechargeable batteries due to their small ionic radius and wide availability. However, little attention has been paid to hydrogen-ion storage devices because they generally deliver relatively low Coulombic efficiency as a result of the hydrogen evolution reaction that occurs in an aqueous electrolyte. Herein, we successfully demonstrate that hydrogen ions can be electrochemically stored in an inorganic molybdenum trioxide (MoO3) electrode with high Coulombic efficiency and stability...
May 11, 2018: Angewandte Chemie
Taisiia Berestok, Pablo Guardia, Javier Blanco Portals, Sonia Estrade, Jordi Llorca, Francesca Peiró, Andreu Cabot, Stephanie L Brock
Colloidal nanocrystals (NCs) compete with molecular catalysts in the field of homogenous catalysis, offering an easier recyclability and a number of potentially advantageous functionalities, such as tunable band gaps, plasmonic properties or a magnetic moment. Using high throughput printing technologies, colloidal NCs can be also supported onto substrates to produce cost-effective electronic, optoelectronic, electrocatalytic and sensing devices. For both catalytic and technological application, NCs surface chemistry and supracrystal organization are key parameters determining final performance...
May 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Athanasia Kostopoulou, Konstantinos Brintakis, Eirini Fragogeorgi, Amalia Anthousi, Liberato Manna, Sylvie Begin-Colin, Claire Billotey, Anthi Ranella, George Loudos, Irene Athanassakis, Alexandros Lappas
Advances in surfactant-assisted chemical approaches have led the way for the exploitation of nanoscale inorganic particles in medical diagnosis and treatment. In this field, magnetically-driven multimodal nanotools that perform both detection and therapy, well-designed in size, shape and composition, are highly advantageous. Such a theranostic material—which entails the controlled assembly of smaller (maghemite) nanocrystals in a secondary motif that is highly dispersible in aqueous media—is discussed here...
May 9, 2018: Nanomaterials
Daniel Prochowicz, Arkadiusz Kornowicz, Janusz Lewiński
No abstract text is available yet for this article.
May 10, 2018: Chemical Reviews
Tobias Hokamp, Leonardo Mollari, Lewis C Wilkins, Rebecca L Melen, Thomas Wirth
Non-iodinated arenes are easily and selectively converted into (diacetoxyiodo)arenes in a single step under mild conditions using iodine triacetates as reagents. The oxidative step is decoupled from the synthesis of hypervalent iodine(III) reagents which can now be prepared conveniently in a one-pot synthesis for subsequent reactions without prior purification. The chemistry of iodine triacetates was also expanded to heteroatom ligand exchanges to form novel inorganic hypervalent iodine compounds.
May 10, 2018: Angewandte Chemie
Gang Han, Jiang Tao Liu, Kangjia Lu, Tai-Shung Chung
A facile and versatile approach was demonstrated for the fabrication of low-fouling pressure retarded osmosis (PRO) membranes for osmotic power generation from highly polluted wastewater. A water-soluble zwitterionic random copolymer with superior hydrophilicity and unique chemistry was molecularly designed and synthesized via a single-step free-radical polymerization between 2-methacryloyloxyethyl phosphorylcholine (MPC) and 2-aminoethyl methacrylate hydrochloride (AEMA). The P[MPC-co-AEMA] copolymer was then chemically grafted onto the surface of PES&Torlon hollow fibers via amino groups coupling of poly(AEMA) with the polyimide structures of Torlon, leaving the zwitterions of poly(MPC) in the feed solution...
May 9, 2018: Environmental Science & Technology
Victor V Volkov, David J Belton, Carole C Perry
Structural properties of bioinorganic composites are of current interest in the areas of drug delivery, bone repair and biomimetics. In such composite systems, structural analysis is enhanced when we combine methods of spectroscopy and simulation. Depending on size and shape, structural discontinuities of inorganic matter may modulate the optical response of a bound molecule. Using Density Functional Theory we explore the effects of a local field next to the surface of a silica cluster on frequencies of methyl stretching modes of associated methanols...
May 8, 2018: Journal of Physical Chemistry. A
Yuji Sun, Jianglin Zhang, Yuanbin Zhang, Jiyong Liu, Stijn van der Veen, Simon Duttwyler
The synthesis and application of icosahedral boron cluster compounds has been studied extensively since their discovery several decades ago; however, two aspects of their chemistry have received little attention: The possibility to form inorganic/organic fused boraheterocycles and their potential to act as antimicrobial agents. This work comprises the preparation of a class of three-dimensional diborabenzoxazole analogues with the closo-dodecaborate in place of the benzene moiety. The presented synthetic procedures provide access to a wide range of diboraheterocycles under mild conditions...
May 8, 2018: Chemistry: a European Journal
Susmita Bose, Dishary Banerjee, Samuel Robertson, Sahar Vahabzadeh
Calcium phosphate (CaP) ceramics show significant promise towards bone graft applications because of the compositional similarity to inorganic materials of bone. With 3D printing, it is possible to create ceramic implants that closely mimic the geometry of human bone and can be custom-designed for unusual injuries or anatomical sites. The objective of the study was to optimize the 3D-printing parameters for the fabrication of scaffolds, with complex geometry, made from synthesized tricalcium phosphate (TCP) powder...
May 4, 2018: Annals of Biomedical Engineering
Shuqing He, Jun Song, Junle Qu, Zhen Cheng
The development of fluorophores and molecular probes for the second near-infrared biological window (NIR-II, 1000-1700 nm) represents an important, newly emerging and dynamic field in molecular imaging, chemical biology and materials chemistry. Because of reduced scattering, minimal absorption and negligible autofluorescence, NIR-II imaging provides high resolution, a high signal-to-noise ratio, and deep tissue penetration capability. Among various state-of-the-art bioimaging modalities, one of the greatest challenges in developing novel probes is to achieve both high resolution and sensitivity...
May 4, 2018: Chemical Society Reviews
Muratahan Aykol, Shyam S Dwaraknath, Wenhao Sun, Kristin A Persson
Realizing the growing number of possible or hypothesized metastable crystalline materials is extremely challenging. There is no rigorous metric to identify which compounds can or cannot be synthesized. We present a thermodynamic upper limit on the energy scale, above which the laboratory synthesis of a polymorph is highly unlikely. The limit is defined on the basis of the amorphous state, and we validate its utility by effectively classifying more than 700 polymorphs in 41 common inorganic material systems in the Materials Project for synthesizability...
April 2018: Science Advances
Patrick F Muldoon, Chong Liu, Carson C Miller, Samuel Benjamin Koby, Michael O'Keeffe, Tian-Yi Luo, Nathaniel L Rosi, Sunil Saxena, Austin Gamble Jarvi
The use of diverse building blocks, such as multiple different heterometallic clusters, in metal-organic framework (MOF) syntheses greatly increases the complexity of the resulting materials and leads to emergent synergistic properties. However, this area has not been fully explored due to the inherent difficulty in applying reticular chemistry to syntheses involving more than two molecular building blocks. We are therefore motivated to develop a strategy for achieving systematic and differential control over the coordination of multiple metals in MOFs...
May 3, 2018: Journal of the American Chemical Society
Jiangchuan Shen, Brenna J C Walsh, Ana Lidia Flores-Mireles, Hui Peng, Yifan Zhang, Yixiang Zhang, Jonathan C Trinidad, Scott J Hultgren, David P Giedroc
Recent studies of hydrogen sulfide (H2S) signaling implicate low molecular weight (LMW) thiol persulfides and other reactive sulfur species (RSS) as signaling effectors. Here, we show that a CstR protein from the human pathogen Enterococcus faecalis ( E. faecalis), previously identified in Staphylococcus aureus ( S. aureus), is an RSS-sensing repressor that transcriptionally regulates a cst-like operon in response to both exogenous sulfide stress and Angeli's salt, a precursor of nitroxyl (HNO). E. faecalis CstR reacts with coenzyme A persulfide (CoASSH) to form interprotomer disulfide and trisulfide bridges between C32 and C61' which negatively regulate DNA binding to a consensus CstR DNA operator...
April 30, 2018: ACS Chemical Biology
Yuangang Xu, Qiuhan Lin, Pengcheng Wang, Ming Lu
Pentazolate anion (cyclo-N₅¯), and/or N₃¯, NO₃¯ were used as the ligands to obtain a series of nitrogen-rich energetic 3D MOFs [Cu(N₅)(N₃)]n, [Ag(N₅)]n, [Ba(N₅)(NO₃)(H₂O)₃]n, and [NaBa₃(N₅)₆(NO₃)(H₂O)₃]n by self-assembly. These frameworks were characterized by single-crystal X-ray diffraction, SEM, IR and Raman spectroscopy, elemental analysis, and thermal analysis. All the frameworks exhibited regular supramolecular structures and excellent stability at room temperature which can be attributed to the strong coordination bonds between cyclo-N₅¯ anions and metal ions...
April 27, 2018: Chemistry, An Asian Journal
Atanu Chakraborty, Chumki Dalal, Nikhil R Jana
Chemically and biochemically functionalized colloidal nanoparticle with appropriate surface chemistry are essential for various biomedical application. Although a variety of approaches are now available in making such functional nanoparticle and nanobioconjugate, the lack of complementary surface chemistry often leads to poor performance toward intended biomedical applications. This feature article will focus on our effort in making colloidal nanobioconjugates with appropriate/complementary surface chemistry for better performance of designed nanoprobe towards cellular and subcellular targeting applications...
April 26, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ib Holzmeister, Martha Schamel, Jürgen Groll, Uwe Gbureck, Elke Vorndran
Biohybrids can be defined as the functional combination of proteins, viable cells or microorganisms with non-biological materials. This article reviews recent findings on the encapsulation of microorganisms and eukaryotic cells in inorganic matrices such as silica gels or cements. The entrapment of biological entities into a support material is of great benefit for processing since the encapsulation matrix protects sensitive cells from shear forces, unfavourable pH changes, or cytotoxic solvents, avoids culture-washout, and simplifies the separation of formed products...
April 23, 2018: Acta Biomaterialia
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