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https://www.readbyqxmd.com/read/28937753/facile-substitution-of-bridging-so2-2-ligands-in-re12-bioctahedral-cluster-complexes
#1
Yakov M Gayfulin, Anton I Smolentsev, Svetlana G Kozlova, Igor N Novozhilov, Pavel E Plyusnin, Nikolay B Kompankov, Yuri V Mironov
Selective substitution of μ-SO2(2-) groups by either O(2-) or Se(2-) ions occurs upon heating the bioctahedral rhenium cluster complex K6[Re12CS14(μ-SO2)3(CN)6] in air atmosphere or in the presence of a Se source, respectively, manifesting the remarkable lability of SO2(2-) ligands bound to a transition-metal cluster. A series of compounds based on the new mixed-ligand anions, [Re12CS14(μ-O)3(CN)6](6-), [Re12CS14(μ-Se)3(CN)6](6-), and [Re12CS14(μ-O)3(OH)6](6-), were isolated and their solid-state structures were elucidated by single-crystal X-ray diffraction analysis...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28929746/atomic-layer-deposition-of-rhenium-aluminum-oxide-thin-films-and-reox-incorporation-in-a-metal-organic-framework
#2
Martino Rimoldi, Joseph T Hupp, Omar K Farha
Methyltrioxorhenium (ReO3Me) is introduced as the first rhenium atomic layer deposition (ALD) precursor and used to grow rhenium aluminum oxide thin films in combination with trimethylaluminum (TMA - AlMe3). The growth rate of the smooth Re-Al oxide films, with general stoichiometry RexAlyO3x, has been monitored by in situ quartz crystal microbalance (QCM) and ex situ ellipsometry, and found to be 3.2 Å/cycle. X-ray photoelectron spectroscopy (XPS) revealed the mixed valent composition of the film with Re(III) species being the main component...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929597/olefin-supported-rhenium-iii-terminal-oxo-complexes-generated-by-nucleophilic-addition-to-a-cyclopentadienyl-ligand
#3
Trevor Lohrey, Robert Bergman, John Arnold
The reactivity of the oxo Re(V) β-diketiminate, OReCl2(BDI), with various cyclopentadienide (Cp) sources has been investigated. As a result, we have developed a route to a new class of terminal oxo complexes of Re(III) supported by olefin moieties of substituted cyclopentadienes. The success of this pathway is due to the electrophilic nature of the Cp ligand in the cation, [ORe(η5-Cp)(BDI)]+ (3+), which allows for nucleophilic attack by a variety of reagents under mild conditions. In contrast, tBuNC was found to attack at the oxo moiety to produce isocyanate by oxygen atom transfer...
September 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28918630/assessing-the-reliability-of-mfa-results-the-cases-of-rhenium-gallium-and-germanium-in-the-us-economy
#4
Grégoire Meylan, Barbara K Reck, Helmut Rechberger, Thomas E Graedel, Oliver Schwab
Decision-makers traditionally expect "hard facts" from scientific inquiry, an expectation the results of Material Flow Analyses (MFAs) can hardly meet. MFA limitations are attributable to incompleteness of flowcharts, limited data quality, and model assumptions. Moreover, MFA results are mostly less based on empirical observation and rather on social knowledge construction processes. Developing, applying, and improving means for evaluating and communicating reliability of MFA results is imperative. We apply two recently proposed approaches for making quantitative statements on MFA reliability to national minor metals systems: rhenium, gallium, and germanium in the US in 2012...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28914686/rhenium-188-as-a-therapeutic-radionuclide-in-low-income-and-middle-income-countries
#5
Ajit Shinto, Ambi M R Pillai
No abstract text is available yet for this article.
September 15, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28913709/unprecedented-anticancer-activities-of-organorhenium-sulfonato-and-carboxylato-complexes-against-hormone-dependent-mcf-7-and-hormone-independent-triple-negative-mda-mb-231-breast-cancer-cells
#6
Paul T Wilder, David J Weber, Angela Winstead, Sabreea Parnell, Tiara V Hinton, Monet Stevenson, Dipak Giri, Samira Azemati, Pola Olczak, Brent V Powell, Tijesunimi Odebode, Solomon Tadesse, Yongchao Zhang, Saroj K Pramanik, James M Wachira, Sujan Ghimire, Pumtiwitt McCarthy, Alexis Barfield, Hirendra N Banerjee, Chao Chen, James A Golen, Arnold L Rheingold, Jeanette A Krause, Douglas M Ho, Peter Y Zavalij, Roosevelt Shaw, Santosh K Mandal
Cisplatin and other metal-based drugs often display side effects and tumor resistance after prolonged use. Because rhenium-based anticancer complexes are often less toxic, a novel series of organorhenium complexes were synthesized of the types: XRe(CO)3Z (X = α-diimines and Z = p-toluenesulfonate, 1-naphthalenesulfonate, 2-naphthalenesulfonate, picolinate, nicotinate, aspirinate, naproxenate, flufenamate, ibuprofenate, mefenamate, tolfenamate, N-acetyl-tryptophanate), and their biological properties were examined...
September 14, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28868546/enhancement-of-the-photocatalytic-activity-of-rhenium-i-complexes-by-encapsulation-in-light-harvesting-soft-nanotubes
#7
Naohiro Kameta, Masaru Aoyagi, Masumi Asakawa
Dye-assembled soft nanotubes with controlled-diameter nanochannels functioned as light-harvesting antennae to strongly enhance the photocatalytic activity of Re(i) complexes encapsulated in their nanochannels.
September 4, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28843158/development-of-bone-seeker-radiopharmaceuticals-by-scandium-47-and-estimation-of-human-absorbed-dose
#8
Leila Deilami-Nezhad, Leila Moghaddam-Banaem, Mahdi Sadeghi
In this study labeling EDTMP (ethylenediamine tetra(methylene phosphonic acid)) and HEDP (Hydroxyethylidene-1, 1-Diphosphonic Acid) as the carrier ligands with Scandium-47 were investigated. The biokinetics of the bone seeking of labeled ligands with Scandium-47 were assessed by measuring the skeletal absorbed dose and then the mice data extrapolated to human absorbed dose and compared with the (186/188)Rhenium-HEDP, (153)Samarium-EDTMP dosimetry data estimated by other researchers. Because the availability of (47)Sc was limited we performed some preliminary studies using (46)Sc...
August 1, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28834058/electrochemical-co2-reduction-at-glassy-carbon-electrodes-functionalized-by-mn-i-and-re-i-organometallic-complexes
#9
Cunfa Sun, Laura Rotundo, Claudio Garino, Luca Nencini, Sam S Yoon, Roberto Gobetto, Carlo Nervi
The catalytic activities towards electrochemical CO2 reduction of two new rhenium and manganese complexes, namely fac-Mn(apbpy)(CO)3 Br (1) and fac-Re(apbpy)(CO)3 Cl (2) (apbpy=4-(4-aminophenyl)-2,2'-bipyridine), in both homogeneous and heterogeneous phases are compared. A glassy carbon electrode (GCE) surface has been functionalized with complexes 1 and 2 by two approaches: a) direct electrochemical oxidation of the amino group with formation of C-N bonds, and b) electrochemical reduction of the corresponding diazonium salts with formation of C-C bonds...
August 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28833727/viking-helmet-corroles-activating-inert-oxidometal-corroles
#10
Peter Schweyen, Kai Brandhorst, Martin Hoffmann, Benedikt Wolfram, Marc-Kevin Zaretzke, Martin Bröring
Chemically inert oxidometal(V) corrols of Molybdenum and Rhenium undergo clean ligand exchange reactions upon the action of SiCl4. The resulting dichlorido complexes show trigonal prismatic coordination of the metal ion with the chlorine atoms residing in a cis configuration, and were studied by optical and resonance spectroscopy as well as DFT calculations. In situ reactivity studies with carbon nucleophiles indicate high reactivity for chlorine replacement. Treatment with sodium cyclopentadienide paves the way to robust molybdenum corrolocene half-sandwich complexes...
August 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28820602/intricate-resonant-raman-response-in-anisotropic-res2
#11
Amber McCreary, Jeffrey R Simpson, Yuanxi Wang, Daniel Rhodes, Kazunori Fujisawa, Luis Balicas, Madan Dubey, Vincent H Crespi, Mauricio Terrones, Angela R Hight Walker
The strong in-plane anisotropy of rhenium disulfide (ReS2) offers an additional physical parameter that can be tuned for advanced applications such as logic circuits, thin-film polarizers, and polarization-sensitive photodetectors. ReS2 also presents advantages for optoelectronics, as it is both a direct-gap semiconductor for few-layer thicknesses (unlike MoS2 or WS2) and stable in air (unlike black phosphorus). Raman spectroscopy is one of the most powerful characterization techniques to nondestructively and sensitively probe the fundamental photophysics of a 2D material...
September 12, 2017: Nano Letters
https://www.readbyqxmd.com/read/28815903/rhenium-loaded-tio2-a-highly-versatile-and-chemoselective-catalyst-for-the-hydrogenation-of-carboxylic-acid-derivatives-and-the-n-methylation-of-amines-using-h2-and-co2
#12
Takashi Toyao, Hakim S M A Siddiki, Yoshitsugu Morita, Takashi Kamachi, Abeda S Touchy, Wataru Onodera, Kenichi Kon, Shinya Furukawa, Hiroko Ariga, Kiyotaka Asakura, Kazunari Yoshizawa, Ken-Ichi Shimizu
Herein, we report a heterogeneous TiO2-supported Re catalyst (Re/TiO2) that promotes various selective hydrogenation reactions, e.g. hydrogenation of esters to alcohols, hydrogenation of amides to amines, and N-methylation of amines using H2 and CO2. Initially, Re/TiO2 was evaluated in the context of the selective hydrogenation of 3-phenylpropionic acid methyl ester to afford 3-phenylpropanol (pH2 = 5 MPa, T = 180 ºC), where revealed a superior performance relative to other catalysts explored in this study...
August 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28813041/supported-nickel-rhenium-catalysts-for-selective-hydrogenation-of-methyl-esters-to-alcohols
#13
Kaituo Liu, James Pritchard, Li Lu, Robbert van Putten, M W G M Tiny Verhoeven, Mike Schmitkamp, Xiaoming Huang, Laurent Lefort, Christopher J Kiely, Emiel J M Hensen, Evgeny A Pidko
The addition of Re to Ni on TiO2 yields efficient catalysts for the hydrogenation of acids and esters to alcohols under mild conditions. Rhenium promotes the formation of atomically dispersed and sub-nanometre-sized bimetallic species interacting strongly with the oxide support.
August 29, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28793762/rational-design-of-go-modified-fe3o4-sio2-nanoparticles-with-combined-rhenium-188-and-gambogic-acid-for-magnetic-target-therapy
#14
Yuxiang Yang, Yicheng Liu, Chao Cheng, Haowei Shi, Huan Yang, Hongming Yuan, Chaoying Ni
Peanutlike magnetic-fluorescent Fe3O4/SiO2 nanoparticles, with an effective dynamic diameter of 180 nm, were synthesized via EuO(+) doping and coupling of two Fe3O4 cores and reassembling through the solvothermal process. Spherical pure Fe3O4/SiO2 nanoparticles with an effective dynamic diameter of 230 nm were also prepared for comparison. We designed graphene oxide (GO)-modified core-shell Fe3O4/SiO2 nanoparticles as a nanocarrier for loading gambogic acid (GA) following labeling with radioisotope rhenium-188...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28777540/determination-of-the-isotopic-composition-of-iridium-using-multicollector-icpms
#15
Zuhao Zhu, Juris Meija, Airong Zheng, Zoltan Mester, Lu Yang
Like many other elements, iridium is lacking a calibrated, SI traceable isotope ratio measurement. In this study, we have undertaken absolute isotope amount ratio measurements of iridium by multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) using a state-of-the-art regression model to correct for the instrumental fractionation (mass bias) of isotope ratios using both NIST SRM 997 isotopic thallium and NIST SRM 989 isotopic rhenium as primary calibrators. The optimized regression mass bias correction model is based on incrementally increasing plasma power and short (10-30 min) measurement sessions...
September 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28773844/new-rhenium-doped-srco1-xrexo3-%C3%AE-perovskites-performing-as-cathodes-in-solid-oxide-fuel-cells
#16
Loreto Troncoso, María Celeste Gardey, María Teresa Fernández-Díaz, José Antonio Alonso
In the aim to stabilize novel three-dimensional perovskite oxides based upon SrCoO3-δ, we have designed and prepared SrCo1-xRexO3-δ phases (x = 0.05 and 0.10), successfully avoiding the competitive hexagonal 2H polytypes. Their performance as cathode materials in intermediate-temperature solid oxide fuel cells (IT-SOFC) has been investigated. The characterization of these oxides included X-ray (XRD) and in situ temperature-dependent neutron powder diffraction (NPD) experiments for x = 0.10. At room temperature, SrCo1-xRexO3-δ perovskites are defined in the P4/mmm space group, which corresponds to a subtle tetragonal perovskite superstructure with unit-cell parameters a = b ≈ ao, c = 2ao (ao = 3...
August 24, 2016: Materials
https://www.readbyqxmd.com/read/28772808/production-of-high-purity-anhydrous-nickel-ii-perrhenate-for-tungsten-based-sintered-heavy-alloys
#17
Katarzyna Leszczyńska-Sejda, Grzegorz Benke, Dorota Kopyto, Tomasz Majewski, Michał Drzazga
This paper presents a method for the production of high-purity anhydrous nickel(II) perrhenate. The method comprises sorption of nickel(II) ions from aqueous nickel(II) nitrate solutions, using strongly acidic C160 cation exchange resin, and subsequent elution of sorbed nickel(II) ions using concentrated perrhenic acid solutions. After the neutralization of the resulting rhenium-nickel solutions, hydrated nickel(II) perrhenate is then separated and then dried at 160 °C to obtain the anhydrous form. The resulting compound is reduced in an atmosphere of dissociated ammonia in order to produce a Re-Ni alloy powder...
April 24, 2017: Materials
https://www.readbyqxmd.com/read/28766938/rhenium-and-technetium-oxo-complexes-with-thioamide-derivatives-of-pyridylhydrazine-bifunctional-chelators-conjugated-to-the-tumour-targeting-peptides-octreotate-and-cyclic-rgdfk
#18
Andrea J North, John A Karas, Michelle T Ma, Philip J Blower, Uwe Ackermann, Jonathan M White, Paul S Donnelly
This research aimed to develop new tumor targeted theranostic agents taking advantage of the similarities in coordination chemistry between technetium and rhenium. A γ-emitting radioactive isotope of technetium is commonly used in diagnostic imaging, and there are two β(-) emitting radioactive isotopes of rhenium that have the potential to be of use in radiotherapy. Variants of the 6-hydrazinonicotinamide (HYNIC) bifunctional ligands have been prepared by appending thioamide functional groups to 6-hydrazinonicotinamide to form pyridylthiosemicarbazide ligands (SHYNIC)...
August 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28766633/structure-and-reactivities-of-rhenium-and-technetium-bis-arene-sandwich-complexes-m-%C3%AE-6-arene-2
#19
Giuseppe Meola, Henrik Braband, Sara Jordi, Thomas Fox, Olivier Blacque, Bernhard Spingler, Roger Alberto
Sandwich complexes are important building blocks in medicinal inorganic chemistry for group 6 and 8 elements but are almost unknown for the manganese triad. We present the syntheses and full characterization of the mixed-arene (99)Tc sandwich complexes [(99)Tc(η(6)-hmbz)(η(6)-C6H5-NH3)](PF6)2 and [(99)Tc(η(6)-hmbz)(η(6)-C6H5-Br)](PF6). Both comprise functionalities for conjugation to targeting molecules or for being included as substructures in pharmaceutically active lead compounds. Since η(6)-benzene ligands are too stably bound to be replaced with incoming ligands, we prepared naphthalene complexes [Re(η(6)-C6H6)(η(6)-napht)](+) and [Re(η(6)-napht)2](+)...
August 2, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28764325/anion-exchange-fibers-for-improved-sample-loading-in-ultra-trace-analysis-of-plutonium-by-thermal-ionization-mass-spectrometry
#20
Joseph M Mannion, Charles R Shick, Glenn A Fugate, Brian A Powell, Scott M Husson
A new sample loading procedure was developed for isotope ratio measurements of ultratrace amounts of plutonium with thermal ionization mass spectrometry (TIMS). The goal was to determine the efficacy of a polymer fiber architecture for TIMS sample loading by following similar sample loading procedures as those used in bead loading. Fibers with diameter of approximately 100 μm were prepared from triethylamine-quaternized-poly(vinylbenzyl chloride) cross-linked with diazabicyclo[2.2.2]octane. Fiber sections (2...
September 5, 2017: Analytical Chemistry
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