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https://www.readbyqxmd.com/read/28221777/rhenium-complexes-based-on-2-pyridyl-1-2-3-triazole-ligands-a-new-class-of-co2-reduction-catalysts
#1
H Y Vincent Ching, Xia Wang, Menglan He, Noemi Perujo Holland, Régis Guillot, Cyrine Slim, Sophie Griveau, Hélène C Bertrand, Clotilde Policar, Fethi Bedioui, Marc Fontecave
A series of [Re(N^N)(CO)3(X)] (N^N = diimine and X = halide) complexes based on 4-(2-pyridyl)-1,2,3-triazole (pyta) and 1-(2-pyridyl)-1,2,3-triazole (tapy) diimine ligands have been prepared and electrochemically characterized. The first ligand-based reduction process is shown to be highly sensitive to the nature of the isomer as well as to the substituents on the pyridyl ring, with the peak potential changing by up to 700 mV. The abilities of this class of complexes to catalyze the electroreduction and photoreduction of CO2 were assessed for the first time...
February 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28217365/crystal-structure-of-the-cis-and-trans-polymorphs-of-bis-%C3%AE-2-1-3-benzo-thia-zol-2-yl-phenolato-%C3%AE%C2%BA-3-n-o-o-%C3%AE%C2%BA-3-o-n-o-bis-fac-tri-carbonyl-rhenium-i
#2
Maruthupandiyan Priyatharsini, Bhaskaran Shankar, Malaichamy Sathiyendiran, Navaneethakrishnan Srinivasan, Rajaputi Venkatraman Krishnakumar
The title dinuclear complex, [Re2(C13H8NOS)2(CO)6], crystallizes in two polymorphs where the 2-(1,3-benzo-thia-zol-2-yl)phenolate ligands and two carbonyl groups are trans- (I) or cis-arranged (II) with respect to the [Re2O2(CO)4] core. Polymorphs I and II exhibit a crystallographically imposed centre of symmetry and a twofold rotation axis, respectively. The structures may be described as being formed by two octa-hedrally distorted metal-coordinating units fused through μ-oxido bridges, leading to edge-sharing dimers...
February 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28217345/fac-aceto-nitrile-tricarbon-yl-di-methyl-carbamodi-thio-ato-%C3%AE%C2%BA-2-s-s-rhenium-i-crystal-structure-and-hirshfeld-surface-analysis
#3
Sang Loon Tan, See Mun Lee, Peter J Heard, Nathan R Halcovitch, Edward R T Tiekink
The title compound, [Re(C3H6NS2)(C2H3N)(CO)3], features an octa-hedrally coordinated Re(I) atom within a C3NS2 donor set defined by three carbonyl ligands in a facial arrangement, an aceto-nitrile N atom and two S atoms derived from a symmetrically coordinating di-thio-carbamate ligand. In the crystal, di-thio-carbamate-methyl-H⋯O(carbon-yl) inter-actions lead to supra-molecular chains along [36-1]; both di-thio-carbamate S atoms participate in intra-molecular methyl-H⋯S inter-actions. Further but weaker aceto-nitrile-C-H⋯O(carbonyl) inter-actions assemble mol-ecules in the ab plane...
February 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28217011/rhenium-188-the-poor-man-s-yttrium
#4
EDITORIAL
Ajit Shinto
No abstract text is available yet for this article.
January 2017: World Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28199089/technetium-i-complexes-of-bathophenanthrolinedisulfonic-acid
#5
Abdolreza Yazdani, Nancy Janzen, Shannon Czorny, John F Valliant
Bathophenanthrolinedisulfonate (BPS) complexes of technetium(I) of the type [Tc(CO)3(BPS)(L)](n) (L = imidazole derivatives) were synthesized and evaluated both in vitro and in vivo. [(99m)Tc(CO)3(BPS)(MeIm)](-) (MeIm = 1-methyl-1H-imidazole) was prepared in near-quantitative yield using a convenient two-step, one-pot labeling procedure. A targeted analogue capable of binding regions of calcium turnover associated with bone metabolism was also prepared. Here, a bisphosphonate was linked to the metal through an imidazole ligand to give [(99m)Tc(CO)3(BPS)(ImAln)](2-) (ImAln = an imidazole-alendronate ligand) in high yield...
February 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28189044/preparation-and-evaluation-of-aptes-peg-coated-iron-oxide-nanoparticles-conjugated-to-rhenium-188-labeled-rituximab
#6
Bakhtiar Azadbakht, Hossein Afarideh, Mohammad Ghannadi-Maragheh, Ali Bahrami-Samani, Mehdi Asgari
Radioimmuno-conjugated (Rhenium-188 labeled Rituximab), 3-aminopropyltriethoxysilane (APTES)-polyethylene glycol (PEG) coated iron oxide nanoparticles were synthesized and then characterized. Therapeutic effect and targeting efficacy of complex were evaluated in CD20 express B cell lines and tumor bearing Balb/c mice respectively. To reach these purposes, superparamagnetic iron oxide nanoparticles (SPIONs) were synthesized using coprecipitation method and then their surface was treated with APTES for increasing retention time of SPIONs in blood circulation and amine group creation...
May 6, 2016: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28182418/translation-of-ligand-centered-hydrogen-evolution-reaction-activity-and-mechanism-of-a-rhenium-thiolate-from-solution-to-modified-electrodes-a-combined-experimental-and-density-functional-theory-study
#7
Wuyu Zhang, Andrew Z Haddad, Brady D Garabato, Pawel M Kozlowski, Robert M Buchanan, Craig A Grapperhaus
The homogeneous, nonaqueous catalytic activity of the rhenium-thiolate complex ReL3 (L = diphenylphosphinobenzenethiolate) for the hydrogen evolution reaction (HER) has been transferred from nonaqueous homogeneous to aqueous heterogeneous conditions by immobilization on a glassy carbon electrode surface. A series of modified electrodes based on ReL3 and its oxidized precursor [ReL3][PF6] were fabricated by drop-cast methods, yielding catalytically active species with HER overpotentials for a current density of 10 mA/cm(2), ranging from 357 to 919 mV...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28177296/a-first-principles-model-for-anomalous-segregation-in-dilute-ternary-tungsten-rhenium-vacancy-alloys
#8
Jan Wrobel, Duc Nguyen-Manh, Sergei Dudarev, Krzysztof Kurzydłowski
The occurrence of segregation in dilute alloys under irradiation is a highly unusual phenomenon that has recently attracted attention, simulated by the interest in the fundamental properties of alloys as well as by applications. The fact that solute atoms segregate in alloys that, according to equilibrium thermodynamics, should exhibit full solubility, has significant practical implications, as the formation of precipitates strongly affects physical and mechanical properties. A lattice Hamiltonian model, generalizing so-called "ABV" Ising model and including collective many-body inter-atomic interactions, has been developed to treat rhenium solute atoms and vacancies in tungsten as components of a ternary alloy...
February 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28165752/mechanism-of-me-re-bond-addition-to-platinum-ii-and-dioxygen-activation-by-the-resulting-pt-re-bimetallic-center
#9
Kothanda Rama Pichaandi, Lara Kabalan, Hashem Amini, Guanghui Zhang, Hanyu Zhu, Hilkka I Kenttämaa, Phillip E Fanwick, Jeffrey T Miller, Sabre Kais, S Masoud Nabavizadeh, Mehdi Rashdi, Mahdi M Abu-Omar
Unusual cis-oxidative addition of methyltrioxorhenium (MTO) to [PtMe2(bpy)], (bpy = 2,2'-bipyridine) (1) is described. Addition of MTO to 1 first gives the Lewis acid-base adduct [(bpy)Me2Pt-Re(Me)(O)3] (2) and subsequently affords the oxidative addition product [(bpy)Me3PtReO3] (3). All complexes 1, MTO, 2, and 3 are in equilibrium in solution. The structure of 2 was confirmed by X-ray crystallography, and its dissociation constant in solution is 0.87 M. The structure of 3 was confirmed by extended X-ray absorption fine structure and X-ray absorption near-edge structure in tandem with one- and two-dimensional NMR spectroscopy augmented by deuterium and (13)C isotope-labeling studies...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28147639/tungsten-rhenium-thin-film-thermocouples-for-sic-based-ceramic-matrix-composites
#10
Bian Tian, Zhongkai Zhang, Peng Shi, Chen Zheng, Qiuyue Yu, Weixuan Jing, Zhuangde Jiang
A tungsten-rhenium thin film thermocouple is designed and fabricated, depending on the principle of thermal-electric effect caused by the high temperature. The characteristics of thin film thermocouples in different temperatures are investigated via numerical analysis and analog simulation. The working mechanism and thermo-electric features of the thermocouples are analyzed depending on the simulation results. Then the thin film thermocouples are fabricated and calibrated. The calibration results show that the thin film thermocouples based on the tungsten-rhenium material achieve ideal static characteristics and work well in the practical applications...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28140500/on-the-origin-of-reactivity-enhancement-suppression-upon-sequential-ligation-re-co-x-ch4-x-0-3-couples
#11
Shaodong Zhou, Jilai Li, Maria Schlangen, Helmut Schwarz
The thermal gas-phase reactions of rhenium carbonyl complexes [Re(CO)x ](+) (x=0-3) with methane have been explored by using FT-ICR mass spectrometry complemented by high-level quantum chemical calculation. While it had been concluded in previous studies that addition of closed-shell ligands in general decreases the reactivity of metal ions, the current work provides an exception: the previously demonstrated inertness of atomic Re(+) towards methane is completely changed upon ligation with CO. Both [Re(CO)](+) and [Re(CO)2 ](+) bring about efficient dehydrogenation of the hydrocarbon under ambient conditions...
January 31, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28134389/glyco-functionalized-dinuclear-rhenium-i-complexes-for-cell-imaging
#12
Alessandro Palmioli, Alessandro Aliprandi, Dedy Septiadi, Matteo Mauro, Anna Bernardi, Luisa De Cola, Monica Panigati
The design, synthesis and photophysical characterization of four new luminescent glycosylated luminophores based on dinuclear rhenium complexes, namely Glyco-Re, are described. The derivatives have the general formula [Re2(μ-Cl)2(CO)6(μ-pydz-R)] (R-pydz = functionalized 1,2-pyridazine), where a sugar residue (R) is covalently bound to the pyridazine ligand in the β position. Different synthetic pathways have been investigated including the so-called neo-glycorandomization procedure, affording stereoselectively glyco-conjugates containing glucose and maltose in a β anomeric configuration...
January 30, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28128834/mono-and-bimetallic-manganese-carbonyl-complexes-and-clusters-bearing-imidazol-in-ium-2-dithiocarboxylate-ligands
#13
Tomás F Beltrán, Guillermo Zaragoza, Lionel Delaude
Five complexes with the generic formula fac-[MnBr(CO)3(S2C·NHC)] were obtained by reacting [MnBr(CO)5] with a set of representative imidazol(in)ium-2-dithiocarboxylate zwitterions. These ligands are the adducts of N-heterocyclic carbenes (NHCs) and carbon disulfide. The mononuclear Mn(i) derivatives were coupled with Na[Mn(CO)5] to afford bimetallic [Mn2(CO)6(S2C·NHC)] clusters. Yet, the most convenient strategy to access these dinuclear Mn(0) products implied a direct carbonyl substitution from the [Mn2(CO)10] dimer...
January 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28124691/characterising-molecules-for-fundamental-physics-an-accurate-spectroscopic-model-of-methyltrioxorhenium-derived-from-new-infrared-and-millimetre-wave-measurements
#14
Pierre Asselin, Yann Berger, Thérèse R Huet, Laurent Margulès, Roman Motiyenko, Richard J Hendricks, Michael R Tarbutt, Sean K Tokunaga, Benoît Darquié
Precise spectroscopic analysis of polyatomic molecules enables many striking advances in physical chemistry and fundamental physics. We use several new high-resolution spectroscopic devices to improve our understanding of the rotational and rovibrational structure of methyltrioxorhenium (MTO), the achiral parent of a family of large oxorhenium compounds that are ideal candidate species for a planned measurement of parity violation in chiral molecules. Using millimetre-wave and infrared spectroscopy in a pulsed supersonic jet, a cryogenic buffer gas cell, and room temperature absorption cells, we probe the ground state and the Re[double bond, length as m-dash]O antisymmetric and symmetric stretching excited states of both CH3(187)ReO3 and CH3(185)ReO3 isotopologues in the gas phase with unprecedented precision...
January 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28118029/cytotoxic-effects-of-the-therapeutic-radionuclide-rhenium-188-combined-with-taxanes-in-human-prostate-carcinoma-cell-lines
#15
Rogier Lange, Rob Ter Heine, Wessel N van Wieringen, Adrienne M Tromp, Mayke Paap, Haiko J Bloemendal, John M H de Klerk, N Harry Hendrikse, Albert A Geldof
OBJECTIVE: Rhenium-188-HEDP is an effective radiopharmaceutical for the treatment of painful bone metastases from prostate cancer. The effectiveness of the β-radiation emitted by (188)Re might be enhanced by combination with chemotherapy, using the radiosensitization concept. Therefore, the authors investigated the combined treatment of the taxanes, docetaxel and cabazitaxel, with (188)Re in prostate carcinoma cell lines. MATERIALS AND METHODS: The cytotoxic effects of single and combined treatment with taxanes and (188)Re were investigated in three human prostate carcinoma cell lines (PC-3, DU 145, and LNCaP), using the colony-forming assay...
February 2017: Cancer Biotherapy & Radiopharmaceuticals
https://www.readbyqxmd.com/read/28116361/ambient-aging-of-rhenium-filaments-used-in-thermal-ionization-mass-spectrometry-growth-of-oxo-rhenium-crystallites-and-anti-aging-strategies
#16
Joseph M Mannion, Matthew S Wellons, Charles R Shick, Glenn A Fugate, Brian A Powell, Scott M Husson
Degassing is a common preparation technique for rhenium filaments used for thermal ionization mass spectrometric analysis of actinides, including plutonium. Although optimization studies regarding degassing conditions have been reported, little work has been done to characterize filament aging after degassing. In this study, the effects of filament aging after degassing were explored to determine a "shelf-life" for degassed rhenium filaments, and methods to limit filament aging were investigated. Zone-refined rhenium filaments were degassed by resistance heating under high vacuum before exposure to ambient atmosphere for up to 2 months...
January 2017: Heliyon
https://www.readbyqxmd.com/read/28112865/anisotropic-spectroscopy-and-electrical-properties-of-2d-res2-1-x-se2x-alloys-with-distorted-1t-structure
#17
Wen Wen, Yiming Zhu, Xuelu Liu, Hung-Pin Hsu, Zhen Fei, Yanfeng Chen, Xinsheng Wang, Mei Zhang, Kuan-Hung Lin, Fei-Sheng Huang, Yi-Ping Wang, Ying-Sheng Huang, Ching-Hwa Ho, Ping-Heng Tan, Chuanhong Jin, Liming Xie
2D black phosphorus (BP) and rhenium dichalcogenides (ReX2 , X = S, Se) possess intrinsic in-plane anisotropic physical properties arising from their low crystal lattice symmetry, which has inspired their novel applications in electronics, photonics, and optoelectronics. Different from BP with poor environmental stability, ReX2 has low-symmetry distorted 1T structures with excellent stability. In ReX2 , the electronic structure is weakly dependent on layer numbers, which restricts their property tunability and device applications...
January 23, 2017: Small
https://www.readbyqxmd.com/read/28111677/rhenium-i-complexes-of-n-heterocyclic-carbene-ligands-that-bind-to-amyloid-plaques-of-alzheimer-s-disease
#18
Chung Ying Chan, Asif Noor, Catriona A McLean, Paul S Donnelly, Peter J Barnard
A series of [Re(i)L(CO)3](+) complexes (where L is a bifunctional bis(NHC)-amine ligand) that are analogues of potential Tc-99m diagnostic imaging agents for Alzheimer's disease have been synthesised. One of the complexes bound to amyloid plaques in human frontal cortex brain tissue from subjects with Alzheimer's disease.
January 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28106830/-188-re-v-nitrido-radiopharmaceuticals-for-radionuclide-therapy
#19
REVIEW
Alessandra Boschi, Petra Martini, Licia Uccelli
The favorable nuclear properties of rhenium-188 for therapeutic application are described, together with new methods for the preparation of high yield and stable (188)Re radiopharmaceuticals characterized by the presence of the nitride rhenium core in their final chemical structure. (188)Re is readily available from an (188)W/(188)Re generator system and a parallelism between the general synthetic procedures applied for the preparation of nitride technetium-99m and rhenium-188 theranostics radiopharmaceuticals is reported...
January 19, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/28091651/composition-dependent-charge-transfer-and-phase-separation-in-the-v1-xrexo2-solid-solution
#20
D Mikhailova, N N Kuratieva, Y Utsumi, A A Tsirlin, A M Abakumov, M Schmidt, S Oswald, H Fuess, H Ehrenberg
The substitution of vanadium in vanadium dioxide VO2 influences the critical temperatures of structural and metal-to-insulator transitions in different ways depending on the valence of the dopant. Rhenium adopts valence states between +4 and +7 in an octahedral oxygen surrounding and is particularly interesting in this context. Structural investigation of V1-xRexO2 solid solutions (0.01 ≤ x ≤ 0.30) between 80 and 1200 K using synchrotron X-ray powder diffraction revealed only two polymorphs that resemble VO2: the low-temperature monoclinic MoO2-type form (space group P21/c), and the tetragonal rutile-like form (space group P42/mnm)...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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