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Syed Qaiser Shah, Gul-E-Raana, Ghias Uddin
This investigation aimed to modify finasteride (1) to finasteride dithiocarbamate (2) for subsequent synthesis of the rhenium analogue (3) and [99m Tc]tricarbonyl complexes (4), to assess its prostate cancer (PCa) targeting potential in a rat model. To validate the identity of (4), reference (3) has been synthesized using fac-[Net4 ]2 [ReBr3 (CO)3 ] precursor and characterized by1 H-NMR,13 C-NMR , ESI-MS and elemental analysis. The analogue (4) was synthesized using fac-[99m Tc(H2 O)3 (CO)3 ]+ precursor and its structure was confirmed by comparative HPLC using (3) as a reference...
March 13, 2018: Journal of Labelled Compounds & Radiopharmaceuticals
Ruwei Zhao, Guoru Li, Baitao Zhang, Jingliang He
As a new member of transition metal dichalcogenides (TMDs), rhenium disulfide (ReS2 ), with a nearly unchanged direct bandgap from bulk to monolayer form, is attractive in physics and material fields. By using the optically driving deposition method, the ReS2 saturable absorber (SA) has been fabricated with a modulation depth and saturation fluence of 6.9% and 27.5 μJ/cm2 , respectively. Based on the ReS2 -SA, a multi-wavelength bright-dark pulse pair from a mode-locked fiber laser has been observed experimentally for the first time, to the best of our knowledge...
March 5, 2018: Optics Express
Christopher B Larsen, Oliver S Wenger
Herein a homoleptic rhenium(I) complex bearing three chelating diisocyanide ligands and its photophysical properties are communicated. The complex emits weakly from a high-energy triplet metal-to-ligand charge-transfer excited state with an 8 ns lifetime in deaerated CH3 CN at 22 °C and is shown to act as an efficient photoredox catalyst comparable to [Ir(ppy)3 ] (ppy = 2-phenylpyridine) in representative test reactions.
March 6, 2018: Inorganic Chemistry
Mamina Bhol, Bhaskaran Shankar, Malaichamy Sathiyendiran
Neutral ditopic flexible N-donor ligands (Ln = bis(4-(naphtho[2,3-d]imidazol-1-ylmethyl)phenyl)methane, L1 bis(4-(benzimidazol-1-ylmethyl)phenyl)methane, L2 or bis(4-(2-nonylbenzimidazol-1-ylmethyl)phenyl)methane, L3 ) possessing a bis(4-methylphenyl)methane spacer with two imidazolyl donor units were designed and synthesized. The ligands were utilized to develop metallacavitands analogous to irregular pentagonal-shaped metallacavitands with larger cavities. The metallacavitands 1-4 were assembled from Re2 (CO)10 , a rigid bis-chelating donor (1,4-dihydroxy-9,10-anthraquinone or chloranilic acid) and Ln via a solvothermal approach...
March 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Shaolong Jiang, Liyun Zhao, Yuping Shi, Chunyu Xie, Na Zhang, Zhepeng Zhang, Yahuan Huan, Pengfei Yang, Min Hong, Xiebo Zhou, Jianping Shi, Qing Zhang, Yanfeng Zhang
Rhenium diselenide (ReSe2), which bears in-plane anisotropic optical and electrical properties, is of considerable interest for its excellent applications in novel devices, such as polarization-sensitive photodetectors and integrated polarization-controllers. However, great challenges to date in the controllable synthesis of high-quality ReSe2 have hindered its in-depth investigations and practical applications. Herein, we report a feasible synthesis of monolayer single-crystal ReSe2 flakes on the Au foil substrate by using a chemical vapor deposition route...
March 2, 2018: Nanotechnology
Hila Shalom, Yishay Feldman, Rita Rosentsveig, Iddo Pinkas, Ifat Kaplan-Ashiri, Alexey Moshkovich, Vladislav Perfilyev, Lev Rapoport, Reshef Tenne
Films combining hydroxyapatite (HA) with minute amounts (ca. 1 weight %) of (rhenium doped) fullerene-like MoS₂ (IF) nanoparticles were deposited onto porous titanium substrate through electrophoretic process (EPD). The films were analyzed by scanning electron microscopy (SEM), X-ray diffraction and Raman spectroscopy. The SEM analysis showed relatively uniform coatings of the HA + IF on the titanium substrate. Chemical composition analysis using energy dispersive X-ray spectroscopy (EDS) of the coatings revealed the presence of calcium phosphate minerals like hydroxyapatite, as a majority phase...
February 26, 2018: International Journal of Molecular Sciences
Honghua He, Zhigang Dong, Jiayin Pang, Gao-Lin Wu, Jiyong Zheng, Xingchang Zhang
Coal fly ash (CFA) is an industrial waste generated in huge amounts worldwide, and the management of CFA has become an environmental concern. Recovery of valuable metals from CFA is one of the beneficial reuse options of CFA. Rhenium (Re) is one of the rarest metals in the Earth's crust and one of the most expensive metals of strategic significance in the world market. A CFA at the Jungar Thermal Power Plant, Inner Mongolia, China, contains more Re than two alkaline soils in the surrounding region. Pot experiments were undertaken to grow lucerne (Medicago sativa) and erect milkvetch (Astragalus adsurgens) in a loessial soil and an aeolian sandy soil amended with different rates (5%, 10%, 20%, and 40%) of CFA...
February 26, 2018: Science of the Total Environment
Zhao-Hua Miao, Lan-Xiang Lv, Kai Li, Pei-Ying Liu, Zhenglin Li, Huanjie Yang, Qingliang Zhao, Manli Chang, Liang Zhen, Cheng-Yan Xu
Near-infrared light-mediated theranostic agents with superior tissue penetration and minimal invasion have captivated researchers in cancer research in the past decade. Herein, a probe sonication-assisted liquid exfoliation approach for scalable and continual synthesis of colloidal rhenium disulfide nanosheets, which is further explored as theranostic agents for cancer diagnosis and therapy, is reported. Due to high-Z element of Re (Z = 75) and significant photoacoustic effect, the obtained PVP-capped ReS2 nanosheets are evaluated as bimodality contrast agents for computed tomography and photoacoustic imaging...
February 22, 2018: Small
Chen Lai, Jinshu Wang, Fan Zhou, Wei Liu, Quan Zhang, Deng Luo, Gencai Guo, Yaowu Hao
In this study, rhenium-tungsten mixed particles with different content of rhenium have been prepared by spray-drying method followed by hydrogen reduction. Using such particles, the cathodes have been prepared by powder metallurgy followed by impregnating BaO, CaO, and Al2O3 with 4:1:1 molar ratio. After proper activation, electron emission test is performed in standard parallel-plate diode configuration. The emission results reveal that the Re-W matrix cathode containing 75% rhenium has the highest direct current emission density of 11...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Parul Thakral, Jyotsna, Pankaj Tandon, Sugandha Dureja, Vineet Pant, Ishita Sen
Aim: The aim of this study is to estimate whole-body radiation dose to the radiopharmacist involved in labeling of three different 188Re-labeled compounds, namely, 188Re-Lipiodol, 188Re-tin colloid, and 188Re-hydroxyl-ethylidene-diphosphonate (HEDP) and to compare the occupational burden with the dose limits recommended by Atomic Energy Regulatory Board, India. Materials and Methods: The Department of Nuclear Medicine at Fortis Memorial Research Institute currently synthesizes three different Rhenium-188 labeled compounds, namely, 188Re-Lipiodol, 188Re-HEDP, and 188Re-tin colloid...
January 2018: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
Markus Pschenitza, Simon Meister, Bernhard Rieger
A significant decrease in the amount of the sacrificial electron donor triethanolamine (TEOA) required for the homogeneous photocatalytic reduction of CO2 using rhenium-based catalytic systems can be achieved by adding small quantities of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) to the reaction mixture. The turnover numbers (TONs) and frequencies (TOFs) measured for the reactions described herein are even higher than those observed in reaction mixtures containing high concentrations of TEOA. Furthermore, replacing TEOA with DBU in the solutions of Re(i)/Ru(ii) mixed catalytic systems leads to a doubling of the values of TON and TOF...
February 8, 2018: Chemical Communications: Chem Comm
Peng Miao, Jing-Kai Qin, Yunfeng Shen, Huimin Su, Junfeng Dai, Bo Song, Yunchen Du, Mengtao Sun, Wei Zhang, Hsing-Lin Wang, Cheng-Yan Xu, Ping Xu
2D transition metal dichalcogenides materials are explored as potential surface-enhanced Raman spectroscopy substrates. Herein, a systematic study of the Raman enhancement mechanism on distorted 1T (1T') rhenium disulfide (ReS2 ) nanosheets is demonstrated. Combined Raman and photoluminescence studies with the introduction of an Al2 O3 dielectric layer unambiguously reveal that Raman enhancement on ReS2 materials is from a charge transfer process rather than from an energy transfer process, and Raman enhancement is inversely proportional while the photoluminescence quenching effect is proportional to the layer number (thickness) of ReS2 nanosheets...
February 7, 2018: Small
Yulia M Litvinova, Yakov M Gayfulin, Konstantin A Kovalenko, Denis G Samsonenko, Jan van Leusen, Ilya V Korolkov, Vladimir P Fedin, Yuri V Mironov
The redox-active rhenium octahedral cluster unit [Re6Se8(CN)6]4- was combined with Gd3+ ions and dicarboxylate linkers in novel types of metal-organic frameworks (MOFs) that display a set of functional properties. The hydrolytically stable complexes [{Gd(H2O)3}2(L)Re6Se8(CN)6]·nH2O (1, L = furan-2,5-dicarboxylate, fdc; 2, L = thiophene-2,5-dicarboxylate, tdc) exhibit a 3D framework of trigonal symmetry where 1D chains of [{Gd(H2O)3}2(L)]4+ are connected by [Re6Se8(CN)6]4- clusters. Frameworks contain spacious channels filled with H2O...
February 5, 2018: Inorganic Chemistry
Jorge Jimenez, Indranil Chakraborty, Annmarie Dominguez, Jorge Martinez-Gonzalez, W M Chamil Sameera, Pradip K Mascharak
A photoactive manganese carbonyl complex derived from dansylimidazole (Imdansyl), namely, [Mn(Imdansyl)(CO)3(phen)](CF3SO3) (1), has been synthesized and structurally characterized. This is the first luminescent manganese carbonyl-based photoCORM reported in the literature. This complex exhibits CO release under the exclusive control of low-power broadband visible light. The corresponding rhenium carbonyl complex, namely, [Re(Imdansyl)(CO)3(phen)](CF3SO3) (2), has also been reported, which is luminescent but sensitive only to UV-B (λ<315 nm) light...
February 2, 2018: Inorganic Chemistry
Wugang Liao, Wei Wei, Yu Tong, Wai Kin Chim, Chunxiang Zhu
Layered rhenium disulfide (ReS2) field effect transistors (FETs), with thickness ranging from few to dozens of layers, are demonstrated on 20 nm-thick HfO2/Si substrates. A small threshold voltage of -0.25 V, high on/off current ratio of up to ~107, small subthreshold swing of 116 mV/dec, and electron carrier mobility of 6.02 cm2/V·s are obtained for the two-layer ReS2 FETs. Low frequency noise characteristics in ReS2 FETs are analyzed for the first time and it is found that the carrier number fluctuation mechanism well describes the flicker (1/f) noise of ReS2 FETs with different thicknesses...
February 1, 2018: ACS Applied Materials & Interfaces
Malgorzata Lipowska, Nashwa Jarkas, Ronald J Voll, Jonathon A Nye, Jeffrey Klenc, Mark M Goodman, Andrew T Taylor
INTRODUCTION: Our previous work demonstrated that the 99mTc renal tracer, 99mTc(CO)3(FEDA) (99mTc-1), has a rapid clearance comparable in rats to that of 131I-OIH, the radioactive gold standard for the measurement of effective renal plasma flow. The uncharged fluoroethyl pendant group of 99mTc-1 provides a route to the synthesis of a structurally analogous rhenium-tricarbonyl 18F renal imaging agent, Re(CO)3([18F]FEDA) (18F-1). Our goal was to develop an efficient one-step method for the preparation of 18F-1 and to compare its pharmacokinetic properties with those of 131I-OIH in rats...
December 27, 2017: Nuclear Medicine and Biology
Sankha Mukherjee, Avinav Banwait, Sean Grixti, Nikhil A Koratkar, Chandra Veer Singh
Single layer Rhenium disulfide (ReS2) is a unique material with distinctive, anisotropic electronic, mechanical and optical properties and has the potential to be used as an anode in alkali metal ion batteries. In this work, first principles calculations were performed to systematically evaluate the potential of monolayer pristine and defective ReS2 as anodes in lithium (Li) and sodium (Na)-ion batteries. Our calculations suggest that there are several potential adsorption sites for Li and Na on pristine ReS2, owing to its low-symmetry structure...
January 19, 2018: ACS Applied Materials & Interfaces
Minoru Waki, Ken-Ichi Yamanaka, Soichi Shirai, Yoshifumi Maegawa, Yasutomo Goto, Yuri Yamada, Shinji Inagaki
This paper describes the physicochemical properties of a rhenium (Re) complex [Re(bpy)(CO)3Cl] immobilized on a bipyridine-periodic mesoporous organosilica (BPy-PMO) acting as a solid support. The immobilized Re complex generated a metal-to-ligand charge transfer absorption band at 400 nm. This wavelength is longer than that exhibited by Re(bpy)(CO)3Cl in the polar solvent acetonitrile (371 nm) and is almost equal to that in nonpolar toluene (403 nm). The photocatalytic activity of this heterogeneous Re complex was lower than that of a homogeneous Re complex due to the reduced phosphorescence lifetime resulting from immobilization...
January 14, 2018: Chemistry: a European Journal
Joanna Borowiec, William P Gillin, Maureen A C Willis, Filippo S Boi, Y He, J Q Wen, S L Wang, Leander Schulz
In this study, a direct sulfidation reaction of ammonium perrhenate (NH4ReO4) leading to a synthesis of rhenium disulfide (ReS2) is demonstrated. These findings reveal the first example of a simplistic bottom-up approach to the chemical synthesis of crystalline ReS2. The reaction presented here takes place at room temperature, in an ambient and solvent-free environment and without the necessity of a catalyst. The atomic composition and structure of the as-synthesized product were characterized using several analysis techniques including energy dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy, x-ray diffraction, transmission electron microscopy, Raman spectroscopy, thermogravimetric analysis and differential scanning calorimetry...
January 11, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Sierra C Marker, Samantha N MacMillan, Warren R Zipfel, Zhi Li, Peter C Ford, Justin J Wilson
Fifteen water-soluble rhenium compounds of the general formula [Re(CO)3(NN)(PR3)]+, where NN is a diimine ligand and PR3 is 1,3,5-triaza-7-phosphaadamantane (PTA), tris(hydroxymethyl)phosphine (THP), or 1,4-diacetyl-1,3,7-triaza-5-phosphabicylco[3.3.1]nonane (DAPTA), were synthesized and characterized by multinuclear NMR spectroscopy, IR spectroscopy, and X-ray crystallography. The complexes bearing the THP and DAPTA ligands exhibit triplet-based luminescence in air-equilibrated aqueous solutions with quantum yields ranging from 3...
January 11, 2018: Inorganic Chemistry
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