Fourier transform infrared spectra of 3-chloropropanoyl chloride 1, both as a neat liquid and isolated in an argon matrix at 10 K, have been analyzed. These spectra reveal the existence of three conformers, the SA conformer (ф1(C3C2ClO) = 0° and ф2(C1C2C3Cl3) = 180°) being the most stable. T...

The study presents a comprehensive vibrational analysis of N-(4-n-pentyl-oxybenzylidene)-4′-n-hexylaniline liquid crystal molecule. The vibrational observations are supported by potential energy distribution analysis performed by VEDA. The optimized structure and the total electron density surf...

A facile synthetic method for N-alkylated substituted benzochalcogenadiazoles is described. When treated with Meerwein salt, the 4-nitrobenzochalcogenadiazoles have undergone an N-alkylation to afford the expected salts as a mixture of two N1/N3 isomers in toluene. The regioselectivity of the al...

A new integrable hierarchy related to a 4 × 4 matrix isospectral problem is proposed, in which the semi-discrete version of the coupled KdV system is the first member. Subsequently the N-fold Darboux transformation for the second member in the obtained hierarchy is constructed. As applications,...

Complex formation of mixed palladium (II) chloro-hydroxo and palladium(II) bromo-hydroxo complexes have been investigated employing spectrophotometry at 25 °C and an ionic strength of 1.0 M. Hyperquad Simulation and Speciation (HySS) was employed to determine the ideal titration conditions and ...

Ce3+-activated single phase β-Ca2Si(O,N)4 (CSON) and α′-Sr2Si(O,N)4 (SSON) oxonitridosilicate phosphors were synthesized by a conventional solid state reaction method at 1100 °C using LiF as a flux. For comparative purposes, their oxide equivalents, β-Ca2SiO4 (CSO) and α′-Sr2SiO4 (SSO), d...

IR spectra of individual 4-n-dodecyloxybenzoic acid (A) and 4-pyridyl 4′-n-dodecyloxybenzoate (B) compounds as well as IR spectra of 2A:1B and 1A:1B systems were recorded. For the assignment of the experimental vibrational spectra a series of quantum chemical calculations of DFT(B97-D)/6-311++G...

Methodology for the quantitative and qualitative analyses of alkyl- and alk-1-enyl-glycerols derived by Vitride reduction of ether-linked glycerolipids in the presence of an internal standard was developed. The procedure involved preparation of benzoate derivatives that were subsequently analyze...

Chromatographic properties of an octadecyl-bonded alumina (ODA) high-performance liquid chromatographic stationary phase are described and compared with those of commonly used octadecylsilica (ODS) stationary phases. Under reversed-phase conditions, selectivity of the ODA phase is shown to be si...

A method for the determination of denatonium benzoate [benzyldiethyl(2,6-xylylcarbamoylmethyl)ammonium benzoate] in rapeseed oil has been developed which utilizes a simple extraction and concentration technique followed by reversed-phase high-performance liquid chromatography. The column eluent ...

Accurate measurements of the retention of homologous series were made on a phenyl-3-propyl-bonded silica and on a multifunctional silica (simultaneously bonded with n-octadecyl and cyanopropyl groups). It is shown that the retention of these types of phases is governed by their hydrocarbonaceous...

The retention behaviour of a series of 28 monosubstituted benzenes, representing a diverse range of functional groups and substituent shape, were investigated using porous graphitic carbon (PGC) and octadecyl-bonded silica (ODS) stationary phases. For the majority of analytes retention on PGC wa...

Three different reversed phases for high-performance liquid chromatography obtained with monofunctional octadecylsilane or with cross-linked polymethyloctadecylsiloxane with and without trimethylsilane precapping of the substrate were synthesized on the same batch of Nucleosil silica. After exte...

The performance of a monolithic silica capillary column coated with poly(octadecyl methacrylate) (ODM column) for the reversed-phase liquid chromatographic separation of some polar and non-polar compounds was studied, and the results were compared to those obtained by using a monolithic silica c...

High efficiency and highly retentive monolithic silica capillary columns were obtained by polymerization of octadecyl methacrylate using α,α′-azobis-isobutyronitrile (AIBN) as a free radical initiator. Hybrid type monolithic silica columns (25 cm total length × 200 μm I.D.) prepared from a ...

Two new stationary phases modified by alkylimidazoliums were prepared for the first time and characterized. One of the new phases was obtained via monomeric immobilization of octadecylimidazole to γ-chloropropyltrimethoxysilane modified silica to form polar-embedded phase; the other one was pre...

The electron-impact mass spectra of a series of specifically deuterated n-octadecyl benzoates define the positions from which hydrogen atom migration occurs in the reaction paths leading to C18H36⨥ and C7H7O2. The migration step in the path leading to C18H36⨥ and the first of the two migration s...

Metabolic changes induced by 2,2′-(decamethylenedithio)diethanol (tiadenol) and di-(2-ethylhexyl)phthalate (DEHP) in the biosynthesis of phosphatidylcholine (PtdCho) and phosphatidylethanolamine (PtdEtn) in rat liver were compared with changes induced by p-chlorophenoxyisobutyric acid (clofibri...

We examined the effect of di-n-octyl phthalate (DOP) on fatty acid composition of phosphatidylcholine (PC) in Tetrahymena pyriformis NT-1. When Tetrahymena cells were grown in DOP-containing proteose peptone medium, the cell growth was repressed. This repression was attended by decreases in the ...

Self-assembled peptide nanotubes (PNT) are unique nanoscale objects having a great potential for a multitude of applications. We report the congeneric studies on local piezoelectric properties of H-β-(2-Pyridyl)-Ala-OH. It crystallizes in needle shaped microcrystals of the size from the fractio...