Synthesis of nano zinc hydroxide via sol–gel method on silica surface and its potential application in the reduction of cure activator level in the vulcanization of natural rubber

Journal of Sol-Gel Science and Technology - In this article, we have described the synthesis of nano zinc hydroxide on the surface of precipitated silica via the sol–gel precipitation method....     

Theoretical investigation of intramolecular magnetic interaction through an ethylenic coupler

We show that an ethylenic coupler provides a very strong intramolecular magnetic interaction. A recently synthesized nitronyl nitroxide derivative, D-NIT2, is investigated by ab initio quantum chemical methods. The broken symmetry approach yields a coupling constant -541 K that is in good agreement with the observed value in solid state.     

Measurement of inclusive differential cross sections for pp collisions at (square root)s = 1.96 TeV

We present measurements of the inclusive production cross sections of the Gamma(1S) bottomonium state in pp collisions at (square root)s = 1.96 TeV. Using the Gamma(1S) --> mu(+)mu(-) decay mode for a data sample of 159 +/- 10 pb(-1) collected by the D0 detector at the Fermilab Tevatron collider, we determine the differential cross sections as a function of the Gamma(1S) transverse momentum for three ranges of the Gamma(1S) rapidity: 0 < y(Gamma) < or = 0.6, 0.6 < y(Gamma) < or = 1.2, and 1.2 < y(Gamma) < or = 1.8.     

Search for anomalous heavy-flavor quark production in association with W bosons

We search for anomalous production of heavy-flavor quark jets in association with W bosons at the Fermilab Tevatron pp Collider in final states in which the heavy-flavor quark content is enhanced by requiring at least one tagged jet in an event. Jets are tagged using one algorithm based on semileptonic decays of b/c hadrons, and another on their lifetimes. We compare e+jets (164 pb(-1)) and mu+jets (145 pb(-1)) channels collected with the D0 detector at sqrt[s]=1.96 TeV to expectations from the standard model and set upper limits on anomalous production of such events.     

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

Isoporous block copolymer (BCP) films have received exponential interest as highly selective membranes, stemming from their unique morphological features, but their applications in functional devices remain to be realized. Now single‐walled carbon nanotubes (CNTs) were efficiently incorporated into isoporous block copolymer films for chemiresistive sensing at room temperature. Leveraging the efficient charge extraction ability of CNTs together with nanochannel arrays aligned perpendicular to the surface of the films, an ultrafast response time of 0.3 s was achieved for humidity detection with a sensor response of about 800 on changing humidity from 10 % to 95 %. Furthermore, the sensor also responds to various organic vapors, underscoring its promising detection capability.     

Inclusion complexes of cyclodextrins with hydrophobic ionic liquids

Two imidazolium-based hexafluorophosphate ionic liquids (ILs), 1-butyl-3-methylimidazolium hexafluorophosphate and 1-dodecyl-3-methylimidazolium hexafluorophosphate, were used to form inclusion complexes (ICs) with α- and β-cyclodextrins (CDs). Formation of the ICs of each CD with each IL was confirmed by the appearance of a characteristic peak in the UV region. Characterisation of the ICs by NMR and FT-IR spectroscopy provided information about the interactions between the host and guest molecules and the structure of the ICs. Temperature-dependent particle size analysis by dynamic light scattering suggested that the size of the host and the guest governs their stability.     

Volume expansion and vapour–liquid equilibrium of toluene and ethanol with carbon dioxide at high pressures for the selection of optimum operational condition in the GAS process

High-pressure equilibrium data (vapour–liquid equilibria) were measured for CO₂ + toluene and CO₂ + ethanol systems between 298.15K and 318.15K and pressures up to 7.8 MPa. Based on reported relative volume expansion of solvents, the optimum operational condition for production of fine particles in Gas Anti-Solvent process has been suggested. Moreover, thermodynamic modelling of phase equilibria has been done using Peng-Robinson and Soave-Redlich-Kwong (SRK) equations of state along with van der Waals and Huron Vidal (HV) mixing rules. The results showed that the SRK–HV combination has the best accuracy between studied models and is capable of simulating the binary systems investigated in current research.     

Carbonyl Displacement Reaction in Diiron Propane-Dithiolate Complex by Triphenylstibine: Crystal Structure of [Fe2(CO)6-n(SbPh3)n(μ-S2C3H6)] (n = 1 and 2)

Treatment of [Fe₂(CO)₆(μ-S₂C₃H₆)] (1) with triphenylstibine in a 1:1 molar ratio at room temperature in presence of Me₃NO resulted compound [Fe₂(CO)₅(SbPh₃)(μ-S₂C₃H₆)] (2) in 88% yield as red crystals. When the reaction was carried out under a 1:5 molar ratio in presence of Me₃NO, it resulted a monosubstituted compound [Fe₂(CO)₅(SbPh₃)(μ-S₂C₃H₆)] (2) in 63% yield along with a disubstituted compound [Fe₂(CO)₄(SbPh₃)₂(μ-S₂C₃H₆)] (3) in low yield (8%) as red crystals. Reaction of 2 with triphenylstibine in a 1:5 molar ratio under same condition resulted 3 in moderate yield (46%). Compounds 2 and 3 were characterized by elemental analyses, IR, ¹H NMR and ¹³C NMR spectroscopic data. Crystal structures of the compounds were unambiguously determined by single crystal X-Ray diffraction studies. Compound 2 crystalized as monoclinic crystal system with the space group P2₁/c, a?=?9.464(4) Å, b?=?16.902(7) Å, c?=?17.081(7) Å, β?=?101.216(13)° and Z?=?4. Compound 3 was triclinic, space group P-1, a?=?9.552(3) Å, b?=?13.985(5) Å, c?=?16.487(6) Å, α?=?78.372(16)°, β?=?89.976(14)°, γ?=?71.638(11)° and Z?=?2.

Graphic Abstract

Two new diiron propane-1,3-dithiolate complexes, [Fe₂(CO)₅(SbPh₃)(μ-S₂C₃H₆)] (2) and [Fe₂(CO)₄(SbPh₃)₂(μ-S₂C₃H₆)] (3), were synthesized by the displacement of carbonyl groups from [Fe₂(CO)₆(μ-S2C₃H₆)] (1) with triphenylstibine, and the resulting complexes were structurally characterized.

Solid state molecular structure of compound 2 (left) and compound 3 (right)

     

Carbon–hydrogen and carbon–phosphorus bond cleavage in a triruthenium cluster complex containing dppm: The crystal and molecular structures of Ru3(CO)6{μ 3-OPPh2 C2H(C6H4)PPhCH2PPh}(μ 3-OPPh2)Ph and Ru3(CO)6 {μ-OPPh2C2H(C6H4)PPhO}(μ-PPh2)(μ-PPh2O)

The crystal and molecular structures of Ru₃(CO)₆{μ ₃-OPPh₂C₂H(C₆H₄)PPhCH₂PPh}-(μ ₃-OPPh₂)Ph (1) and Ru₃(CO)₆{μ-OPPh₂C₂H(C₆H₄)PPhO}(μ-PPh₂)(μ-PPh₂O) (2) have been determined by single crystal X-ray diffraction. Both complexes contain oxygen atoms oxidatively inserted into phosphorus–ruthenium bonds, and unique σ/π multidentate ligands formed from C $---{\text{H}}$ H and C $--$ P bond cleavage in bis(diphenylphosphino)acetylene and bis(diphenylphosphino)methane. Complex 1 crystallized in the triclinic space group ${\bar 1}$ , with lattice parameters a = 11.642(4) Å, b = 15.018(5) Å, c =16.587(5) Å, α = 2.48(3)°, β = 76.47(2)°, γ = 70.35(3)°, V = 2651.1(15) ų, Z = 2. Complex 2 crystallized in the centered monoclinic space group, C2/c, with lattice parameters a = 34.467(4) Å, b = 14.274(2) Å, c = 23.258(3) Å, β = 5.29(1)°, V = 11394(3) ų, Z = 8.