A simple and efficient microwave-assisted preparation of ReB2-based material is reported utilizing ammonium perrhenate (NH4ReO4), magnesium boride (MgB12) reactants and carbon as an absorber of microwave irradiation. The investigation of microwave irradiated NH4ReO4 +MgB12 +C mixtures, thermal a...

For the small rhenium boride clusters, we carried out detailed calculations based on density-functional theory. The results indicate that the ratio of boron to rhenium with 2:1 and 4:3 possess higher stability among considered RemBn (m=1–3, n=1–3m) clusters, which the ratio with 2:1 was also f...

Based on in situ synchrotron X-ray diffraction experiments employing laser heated diamond anvil cells to investigate the reaction of rhenium and boron from the elements at high-(p, T) conditions, Re7B3 was found to be extremely incompressible, with BRe7B3=435(14)GPa, making it one of the least c...

The searching of hard and superhard materials is a hot topic in material science. Two known factors are fundamental to get high hardness: (1) high valence-electron density; and (2) high number of electron in covalent bonds. The 5d-transition metals comply with requirement (1); so, the task is to...

Based on synchrotron X-ray diffraction on phase-pure samples, we revised the bulk moduli of the rhenium borides Re7B3 (B0 (Re7B3) = 391(5) GPa) and orthorhombic Re3B (B0 (orthorhombic Re3B) = 393(4) GPa) and determined the bulk modulus of monoclinic Re3B (B0 (monoclinic Re3B) = 390(3) GPa). Thes...

Reactions of [Cp*RhCl2]2 with 1,1′-bis(diphenylphosphinomethyl)ferrocene (dpmf) or 1,1′-bis(diphenylphosphino)ferrocene (dppf) gave the bridged complex [Cp*RnCl2]2(μ-diphos) (1: diphos=dpmf; 2: diphos=dppf). Reaction with dppf in the presence of NaPF6 gave the cationic chelated [Cp*RhCl(dppf-...

The dialkyl-μ-ethylidene-μ-methylene-bis (pentamethylcyclopentadienyl)-dirhodium complexes [{(C5Me5)Rh}2(μ-CH2)(μ-CHMe) (R)2] (4, PMe; 5, Et; 6, n-Bu; 7, CHCH2; and 8, Z-CHCHMe) have been prepared from RMgBr and [{(C5Me5)Rh}2(μ-CH2)(μ-CHMe)(X)2] (2, X=Cl; 3, X=Br). Structures deduced...

Reaction of [Cp*IrCl2]2 1 (Cp*=C5Me5) with (2,6-dimethoxyphenyl)diphenylphosphine (MDMPP) at room temperature gave a monohapto-complex [Cp*IrCl2(MDMPP-P)] 2a, whereas the reaction with bis(2,6-dimethoxyphenyl)phenylphosphine (BDMPP) led to loss of one molecule of CH3Cl to give Cp*IrCl[P(C6H3-2-O...

Known Ru(II), Rh(I) and Ir(III) complexes of C2-symmetric ferrocenyl based chiral bis(phoshinite) ligands were catalyzed the asymmetric transfer hydrogenation of alkyl/aryl or alkyl methyl ketones. Corresponding secondary alcohols were obtained with high enantioselectivities up to 98% ee and rea...

Reactions of [Cp*MCl2]2 (1a: M=Rh, 1b: M=Ir; Cp*=C5Me5) with 2-methoxyphenylphosphines at room temperature gave the corresponding 1η-P coordination complexes, [Cp*MCl2(PPh3−nRn)] (2: n=1; 4: n=2; 6b: n=3 for R=C6H4-2-MeO). Reaction of 1 with (2-methoxyphenyl)diphenylphosphine at reflux in digly...

Conductivity, calorimetry, and in-situ XRD can be closely interrelated with each other in terms of the sodium ion ordering and rearrangements in NASICON structure. An intermediate phase transition at 103 °C, not associated with heat effects, is evidenced for the first time, in addition to α–β...

Transition behavior of relaxor lead scandium niobate, Pb(Sc1/2Nb1/2)O3, has been investigated by means of an X-ray diffuse scattering technique. The results show simultaneous occurrence of freezing of ferroelectric and anti-ferroelectric fluctuations. Frustration between dipoles in the two state...

Vibrational properties of Gd substituted lead magnesium niobate (PGMN, Pb1−xGdx(Mg1+x/3Nb2−x/3)O3 with 0 ≤ x ≤ 0.1) ceramics have been investigated by using Raman spectroscopy, which were correlated to the enhancement in dielectric relaxor behaviour. Raman active stretching modes of NbOMg (A1g...

Zeolite (ZSM-5), as a kind of carbon-free sorbent or catalyst, has been widely applied in many fields due to its big surface area, good chemical and thermal stability, and excellent adsorption performance. In this study, Mn-Fe modified ZSM-5 are synthesized via sol-gel approach and employed for ...

Lead nitrate and mercury chloride are the most common heavy metal pollutants. In the present study, the effects of lead and mercury induced nephrotoxicity were studied in Wistar rats. Lead nitrate (LN, 45 mg/kg b.w/day) and mercury chloride (MC, 0.02 mg/kg b.w/day) and their combination were adm...

Graphene was used for the enhancement of gaseous elemental mercury (Hg0) catalytic oxidation and adsorption over Mn-based oxides. A series of graphene modified Mn-based and Ce-Mn-based oxides were prepared via a hydrothermal method. Experimental results indicated that [email protected] composite...

Although the oxidation of elemental mercury (Hg0) on catalyst can be significantly affected by acid gases, its mechanism is still unclear. This study used in situ DRIFT to research the influence of acid gases (NO, HCl and SO2) on the performance of mercury oxidation on catalyst CeO2(5)–WO3(9)/T...

To increase elemental mercury removal efficiency of CuO without HCl gas, the Mn-modified CuO samples were proposed. In this work, four doping ratios of Mn to CuO were fabricated by a hydrothermal synthesis method. The surface morphologies, crystalline structures and chemical states of as-prepare...

Permeable reactive barriers (PRBs) remove nitrogen from groundwater by enhancing microbial denitrification. The PRBs consist of woodchips that provide carbon for denitrifiers, but these woodchips also support other anaerobic microbes, including sulfate-reducing bacteria. Some of these anaerobes ...

Here we report a disposable, cost effective electrochemical paper-based sensor for the detection of both nitrate and mercury ions in lake water and contaminated agricultural runoff. Disposable carbon paper electrodes were functionalized with selenium particles (SePs) and gold nanoparticles (AuNP...