Chemistry

Self-assembly of symmetrical and dissymmetrical dicationic surfactants in the solid phase and in solution
The effect of the spacer structure (linear, cyclic, bicyclic) and dissymmetry of alkyl fragment in a series of dicationic gemini surfactants on the ability to form thermotropic liquid crystals and on the micellar properties was studied. Transitions crystal-thermotropic liquid crystals-isotropic solution were studied using differential scanning calorimetry and optical microscopy. The self-diffus...


Crystal packing of ammonium salts of arylenebis(phenylphosphinic) acids
It was shown for the first time that the crystal packing mode of the ammonium salt of thiophene-2,5-diylbis(phenylphosphinic acid) substantially differs from that of the dimethyl-ammonium salt of 1,4-phenylenebis(phenylphosphinic acid). The former crystal packing is a three-layer supramolecular sandwich structure consisting of two anionic layers separated by a layer of ammonium cations, whereas...
Selective transformations of isatins to substituted 2-oxindoles
In the present review the data concerning selective synthetic transformations of isatins to 2-oxindoles, and studies of their biological activity are summarized.


Quantum chemical approaches to the explanation of differences in NO-donor activity of iron-sulfur nitrosyl complexes
The geometries and electronic structures of iron-sulfur nitrosyl complexes with azaheterocyclic thiols with μ-SCN bridging ligands, [Fe2(SCN4Ph)2(NO)4] (1) and [Fe2(SCN4Me)2(NO)4] (2), were calculated within the framework of the density functional theory (DFT) with the BP86, TPSS, B3LYP, and OPBE functionals in order to explain differences in their NO-donor activities. Chemical bonding in the ...
Titania Nanoparticles Stabilized HPA in SBA-15 for the Intermolecular Hydroamination of Activated Olefins
A liquid phase hydroamination (HA) of α,β-ethylenic compounds with amines was investigated with TiO2 nanoparticles stabilized 12-tungstophosphoric acid (TPA) in SBA-15. The catalysts were prepared by wet impregnation of TPA/TiO2 nanoparticles into the SBA-15 and calcined at different temperatures. The characterization results reveal that the textural properties and the acidity of the prepared...


Behaviour of Amorphous Aluminosilicates towards Ageing by High-Temperature Steaming
The structure of amorphous aluminosilicates obtained by grafting silicon on alumina (Si/Al2O3) mostly remains the same after ageing by steaming. The rearrangement of surface silicon species on the facets of γ-alumina slightly decreases the number of Brønsted acid sites, which is determined through ethanol adsorption followed by thermogravimetry as well as m-xylene isomerisation. Al/SiO2 prepa...
Carbon–Carbon Bond Formation via Electron Transfer: Anodic Coupling
Electrochemical carbon–carbon coupling: Electrolysis is a facile and green route to dimers of alkyl aromatic compounds, enabling cross-couplings of phenols and cyclizations of aryl ethers and enol ethers in high selectivities and yields. This Highlight describes the broad scope and simplicity of anodic coupling. HFIP=Hexafluoroisopropanol.

Catalytic Performance of Brønsted and Lewis Acid Sites in Phenylglyoxal Conversion on Flame-Derived Silica–Zirconia
Flame-derived silica–zirconia has been used for the promising one-step catalytic conversion of phenylglyoxal (PG) to mandelates, important intermediates in pharmacy and fine chemistry. In the literature it was proposed that Lewis acid sites (LAS) on solid acids promote mandelate production, whereas Brønsted acid sites (BAS) only generate acetal byproducts during PG conversion. Herein it is s...
Estimation of Measurement Uncertainties for the DGT Passive Sampler Used for Determination of Copper in Water
Diffusion-based passive samplers are increasingly used for water quality monitoring. While the overall method robustness and reproducibility for passive samplers in water are widely reported, there has been a lack of a detailed description of uncertainty sources. In this paper an uncertainty budget for the determination of fully labile Cu in water using a DGT passive sampler is presented. Uncer...

Conductivity and oxygen reduction activity changes in lanthanum strontium manganite upon low-level chromium substitution
On the timescale of solid oxide fuel cell (SOFC) system lifetime requirements, the thermodynamically predicted low-level substitution of chromium on the B-site of (La,Sr)MnO3 could be a source of cathode degradation underlying more overt and well-known chromium poisoning mechanisms. To study this phenomenon in isolation, electronic conductivity (σ) and electrochemical oxygen reduction activity...
The Major Influences of Substituent Size and Position of 3,4-Propylenedioxythiophene on the Formation of Highly Hydrophobic Nanofibers
The influence of the substituent size and position of 3,4-propylenedioxythiophene (ProDOT) on the surface properties of the corresponding electrodeposited polymer films is shown. The study investigates the influence on the formation of hydrophobic nanofibers using two substituents (isopropyl and tert-butyl). The 3-position of ProDOT is the best for the formation of nanofibers, because it leads ...

Metal(II)–Organic Coordination Polymers Modulated by Two Isomeric Semirigid Bis-Pyridyl–Bis-Amide Ligands: Structures, Fluorescent Sensing Behavior, and Selective Photocatalysis
A series of metal–organic coordination polymers based on two isomeric semirigid bis-pyridyl–bis-amide ligands and 5-methylisophthalic acid (5-H2MIP), namely, [Cu(3-bpah)(5-MIP)]⋅2 H2O (1), [Ni(3-bpah)(5-MIP)]⋅H2O , [Co(3-bpah)(5-MIP)]⋅H2O , [Cu(4-bpah)(5-MIP)(H2O)] , [Ni(4-bpah)(5-MIP)(H2O)]⋅H2O , [Co(4-bpah)(5-MIP)] , [Zn(4-bpah)(5-MIP)] , and [Cd(4-bpah)(5-MIP)] (3-bpah=N,N′-b...
Ferrofluids: Synthetic Strategies, Stabilization, Physicochemical Features, Characterization, and Applications
Ferrofluids (FFs) or magnetic nanofluids are incredible smart materials consisting of ultrafine magnetic nanoparticles suspended in a liquid carrier medium, which exhibit both fluidity and magnetic controllability. Studies involving the dynamics and physicochemical properties of these magnetic nanofluids are an interdisciplinary area of research attracting researchers from different fields of s...
Biofunctionalization of Multiwalled Carbon Nanotubes by Electropolymerized Poly(pyrrole-concanavalin A) Films
The synthesis and electropolymerization of a pyrrolic concanavalin A derivative (pyrrole-Con A) onto a multiwalled carbon nanotube (MWCNT) deposit is reported. Glucose oxidase was then immobilized onto the MWCNT-poly(pyrrole-Con A) coating by affinity carbohydrate interactions with the polymerized Con A protein. The resulting enzyme electrode was applied to the amperometric detection of...
Dynamics Effects Dictate the Mechanism and Selectivity of Dehydration–Rearrangement Reactions of Protonated Alcohols [Me2(R)CCH(OH2)Me]+ (R=Me, Et, iPr) in the Gas Phase
The gas-phase dehydration–rearrangement (DR) reactions of protonated alcohols [Me2(R)CCH(OH2)Me]+ [R=Me (ME), Et (ET), and iPr (I-PR)] were studied by using static approaches (intrinsic reaction coordinate (IRC), Rice–Ramsperger–Kassel–Marcus theory) and dynamics (quasiclassical trajectory) simulations at the B3LYP/6-31G(d) level of theory. The concerted mechanism involves simultaneous ...