Effects of Surfactants on the Spectral Properties of Carbocyanine Dyes in Solutions

The spectral and luminescence properties of an anionic carbocyanine dye were studied under various conditions. These properties were shown to depend on the solvent polarity and additives introduced such as KBr, gelatin, and surfactants. It has been established that the effects of different surfactants (cationic CTAB, anionic SDS, AOT, and nonionic Triton X-100) on the spectral behavior of the dye in solutions are very individual and exhibit a number of features, which cannot be reduced to the rule below CMC–above CMC.     

Preparation and Characterization of Zirconia-Magnesia Support Modified by Alkylphosphonic Acid for Liquid Chromatography

Interest in zirconia as a chromatography support has increased considerably recently because of its chemical inertness and its promise as a useful support. We have reported the preparation of spherical zirconia and characterization of its chromatographic behavior. However, the zirconia was found unsatisfactory for its chromatographic efficiency, probably owing to the poor pore structure of it. In this paper, we for the first time report the preparation of alkylphosphonic acid modified zirconia-magnesia stationary phase, and characterization of its structure and chromatographic behavior.     

Nitrogen-containing heterocycles from metal β-diketonates

Factors determining the reaction of metal β-diketonates with hydrazine, in particular the nature of central metal ion and structure of β-diketonate ligand, are discussed. The possibility for the preparation of other heterocyclic compounds via reaction of metal acetylacetonates with phenylhydrazine, o-phenylenediamine, urea, and thiourea was studied.     

Motion of a planar domain wall in the ferroelectric-ferroelastic gadolinium molybdate

The lateral motion of a planar domain wall (PDW) in an electric field and the spontaneous rotation of the wall in the initial position after the field is switched off were investigated in the improper ferroelectric-ferroelastic gadolinium molybdate Gd₂(MoO₄)₃, using optical visualization and measurement of the switching currents. The characteristic behavior found for the PDW is attributed to the delay of the volume screening of the depolarizing fields. It is shown that the dependence of the motion of the PDW on the switching duration in an ac field is due to the redistribution of the screening charges. Fiz. Tverd. Tela (St. Petersburg) 41, 126–129 (January 1999)     

Calix[4]resorcinols as Stabilizers for Rubber Stocks Based on Butadiene-Acrylonitrile Rubbers

Modification of tetramethylcalix[4]resorcinol with dimethylaminomethyl and 3,5-di-tert-butyl-4-hydroxybenzyl fragments was studied. The antioxidative activity of these macrocyclic stabilizers in rubber stocks based on butadiene-acrylonitrile rubber was examined.     

Radial distribution function and the speed of sound in dense gases and liquids

An expression for the speed of sound is derived in terms of the radial distribution function and its temperature derivative. Since the radial distribution function and the speed of sound can be determined independently from experiments, the relation found can be used to analyze the substance’s phase diagram and the thermodynamic consistency of the equations of state.     

Reaction of peroxydisulfuryl difluoride with some nitroaromatic compounds

Conclusions The reaction of peroxydisulfuryl difluoride with nitro-, chloronitro-, and ethylnitrobenzenes gave the previously unknown fluorosulfates, in which connection the ethylnitrobenzenes are substituted in the nucleus under these conditions.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2638–2640, November, 1981.