Synthesis of Nitrogen Doped Multilayered Graphene Flakes: Selective Non‐enzymatic Electrochemical Determination of Dopamine and Uric Acid in presence of Ascorbic Acid.

Nitrogen doped multilayered graphene (NDMLG) is synthesized by annealing the black fluffy mass obtained by decomposing the complex prepared from Zn(OAc)₂, diethanolamine and triethanolamine. The NDMLG has been characterized by HRTEM, FESEM, XRD, XPS, Raman spectroscopy, BET which indicate formation of nitrogen doped multilayer graphene flakes with high surface area. NDMLG shows better electrochemical oxidation property towards Dopamine, Uric acid and Ascorbic acid. The linear response ranges for determination of DA, UA and AA are 0.5–150 µM, 3–60 µM and 80–2000 µM respectively and the detection limits (S/N=3) are 15 nM, 15 nM, 580 nM, respectively in the mixture.     

Synthesis of Nanoporous Ni‐Co Mixed Oxides by Thermal Decomposition of Metal‐Cyanide Coordination Polymers

A straightforward strategy to prepare nanoporous metal oxides with well‐defined shapes is highly desirable. Through thermal treatment and a proper selection of metal‐cyanide coordination polymers, nanoporous nickel‐cobalt mixed oxides with different shapes (i.e., flakes and cubes) can be easily prepared. Our nanoporous materials demonstrate high electrocatalytic activity for oxygen evolution reaction.     

New microporous metal-organic framework demonstrating unique selectivity for detection of high explosives and aromatic compounds

A highly luminescent three-dimensional microporous metal-organic framework, [Zn(2)(oba)(2)(bpy)]·DMA, demonstrates unique selectivity for the detection of high explosives and other aromatics via a fluorescence quenching and enhancement mechanism.     

Characterization of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][Tf2N])∕TX-100∕cyclohexane ternary microemulsion: investigation of photoinduced electron transfer in this RTIL containing microemulsion

In this study we have characterized a ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethyl- sulfonyl)imide containing ternary nonaqueous microemulsion ([Emim][Tf(2)N]∕∕TX-100∕cyclo- hexane). The phase behavior and dynamic light scattering study show that the [Emim][Tf(2)N]∕TX-100∕cyclohexane three component system can form microemulsion with [Emim][Tf(2)N] as polar core at suitable condition. We have investigated photoinduced electron transfer (PET) using dimethyl aniline as electron donor and several Coumarin dyes as electron acceptor molecules at two different R values (R = [ionic liquid]∕[surfactant]) to observe how the dynamics of the PET rate is affected in this type of confined microenvironment compared to that of the PET dynamics in neat ionic liquid and other pure solvent media. The plot of observed k(q) values with the free energy change (ΔG(0)) for electron transfer reaction shows an apparent inversion in the observed rate as predicted by the Marcus theory.     

Reactivity of tris(acetylacetonato) iron(III) with tridentate [ONO] donor Schiff base as an access to newer mixed-ligand iron(III) complexes

Two new mixed-ligand iron(III) complexes, [Fe(L(n))(acac)(C(2)H(5)OH)] incorporating coordinated ethanol from the reaction solvent were accessed from the reaction of [Fe(acac)(3)] with [ONO] donor dibasic tridentate unsymmetrical Schiff base ligands derived from condensation of 2-hydroxy-1-napthaldehyde with 2-aminophenol (H(2)L(1)) or 2-aminobenzoic acid (H(2)L(2)). The thermal study (TGA-DTA) provided evidence for weakly bound ethanol which is readily substituted by neutral N-donor molecule imidazole, benzimidazole or pyridine to produce an array of newer complexes, [Fe(L(n))(acac)X] (n=1, 2; X=Im, Bim, Py). The compounds were characterized by elemental analyses, FT-IR, UV-vis, solution electrical conductivity, FAB mass, (1)H and (13)C NMR spectroscopy. Room temperature magnetic susceptibility measurements (μ(eff)～5.8 B.M.) are consistent with spin-free octahedral iron(III) complexes. Cyclic voltammetry of ethanol complexes revealed a quasi-reversible one electron redox response (ΔE(p)>100 mV) for the Fe(III)/Fe(II) couple. Low half wave redox potential (E(1/2)) values suggested easy redox susceptibility. The ground state geometries of the ethanol and imidazole complexes have been ascertained to be distorted octahedral by density functional theory using DMol3 program at BLYP/DNP level.     

Structural analysis of biologically active peptides and recombinant proteins and their modified counterparts by mass spectrometry

The structural characterization of the Escherichia coli-expressed human interferon alpha-2b (rh-IFN alpha-2b) was carried out by employing the fast atom bombardment (FAB) and plasma desorption (PD) mapping methods. The mass spectral data of the rh-IFN alpha-2b and the trypsin-generated peptide mixture allowed rapid and facile confirmation of the cDNA-derived sequence and determination of the existing disulfide pattern in the protein molecule. The same PD/FAB mapping approach was successfully employed in the structural determination of the iodination reaction product of rh-IFN alpha-2b and the potent vasoconstrictor peptide endothelin.     

The effect of viscosity on the waves due to a moving oscillatory surface pressure

Summary It is known that when a pressure distributionp ₀(x) exp (i t moves with a constant velocityu ₀ parallel to on the surface (y=0) of an inviscid liquid, (i) the steady-state wave amplitude does not die out at large distances from the source for (u ₀/g1/4, and(ii) the solution becomes singular for u ₀/g=1/4.Here is shown that the consideration of even a slight viscosity of the liquid leads to a wave decay with distance for all (u ₀/g), the solution remaining non-singular for (u ₀/g=1/4. Furthermore, for a finitely distributedp ₀(x), the wave amplitude is always non-zero, unlike in the case of an inviscid fluid, where no energy is transmitted for an infinite number of values of a parameter involving ,u ₀ and the length of the pressure strip.

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Zusammenfassung Es ist bekannt, daß, wenn eine periodische Druckverteilungp ₀(x) exp (i t) sich mit einer konstanten Geschwindigkeitu ₀ inx-Richtung über die Oberflächey=0 einer reibungslosen Flüssigkeit bewegt, daß dann (1) die Amplitude des stationären Zustandes in großen Entfernungen von der Quelle nicht abklingt für (u ₀/g)1/4, und (2) die Lösung wird singulär für (u ₀/g)=1/4.Hier wird gezeigt, daß die Berücksichtigung einer geringen Zähigkeit in der Flüssigkeit zu einem Abklingen der Wellen führt für alle (u ₀/g)=1/4. Zudem ist für eine Verteilung vonp ₀(x) über eine endliche Länge die Wellenamplitude immer endlich, im Gegensatz zum reibungsfreien Fall, in dem keine Energie übertragen wird für gewisse Werte eines Parameters, der ,u ₀ und die Länge des Druckstreifens enthält.

     

Synthesis and fluorescent properties of a new class of heterocycles of isoindole fused imidazoles with phenolic subunits

A new class of heterocycles of isoindole fused imidazoles with phenolic subunits has been readily synthesized by a two-step one-pot reaction. In aprotic solvent they show high fluorescent properties (Phi(F) up to 0.93), but in protic polar solvent fluorescent intensity decreases. They show green fluorescence in weak acidic medium such as acetic acid but lack emission in basic medium. The compounds can also stain human squamous epithelium cells.