Effect of alkali-metal doping on photoluminescence of CdS films

It is established that doping of CdS polycrystalline films with alkaline metals (Li, Na, K, Cs) results in an increase of luminescence intensity by 3–5 times compared with pure films. This increase is accounted for by the placement of alkaline-metal ions in V _Cd ²⁻ cation vacancies, which are nonradiative recombination centers in these films. From the dependences of the luminsecence intensity of the doped films on the synthesis conditions (deposition temperature, concentration of doping impurities, type of doping metal), the parameters that ensure the maximum luminescence intensity of the films are determined as T_dep ≈ 450°C and C_Me = 1·10⁻⁵ at %. The luminescence intensity decreases by 1–3% upon exposure of the films to UV light (λ_max = 365 nm, I = 10²¹ quanta·sec·cm⁻¹) for several hours. This is indicative of the stability of these films against UV radiation. __________ Translated from Zhurnal Prikladnoi Spektroskopii Vol. 74, No. 3, pp. 362–366, May–June, 2007.     

Effect of annelation on the reactivities of benzoquinolines in hetarylation

The π-electron charges, bond orders, dipole moments, and electronic spectra of benzoquinolines were calculated by the self-consistent-field (SCF) method with allowance for the coulombic repulsion of the electrons; the results of the calculations were in satisfactory agreement with the experimental data. The effect of the position of annelation of the benzene ring on the electronic characteristics of benzoquinolines and their basicities and behavior during hetarylation in the presence of acyl halides was evaluated.     

Synthesis,physicochemical properties,and mass spectrometric study of some 8-methyl-6H-thiazolo[3,2-f]xanthines

Alkylation of 8-mercapto-3-methylxanthine with -haloketones has given the corresponding aroylmethylthio-3-methylxanthines, from which have been obtained some novel 3-aryl-8-methyl-6H-thiazolo[3,2-f]xanthines.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1534–1539, November, 1987.     

Diquinolyls

A convenient method was developed for the synthesis of diquinolyls by recombination of quinoline anion radicals formed by reaction of quinolines with active metals. A series of diquinolyls, their homologs, and partially hydrogenated derivatives were obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 385–390, March, 1977.     

Effect of the aggregate state on the conjugation in the 2-(2′-quinolyl)benzoxazole system

It was demonstrated by x-ray diffraction analysis, electronic spectroscopy, and mass spectrometry that the phase state and a decrease in the temperature of the solution have a substantial effect on the dihedral angle between the planes of the rings and the conjugation in the 2-(2-quinolyl)benzoxazole molecule. The molecule is planar in the crystalline state, in the gas phase, and in solution at low temperature. The conjugation is maximal in these cases. The conjugation decreases when the compound is dissolved, and this is reflected in the character of the electronic absorption and emission spectra.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 775–779, June, 1982.     

Reaction of 1,4-diazines with indoles in the presence of acylating agents

2,3-Diindolyl-1,4-diacyl-1,2,3,4-tetrahydropyrazines and 2,3-diindolyl-1,2,3,4-tetrahydroquinoxalines with acyl residues attached to one or both nitrogen heteroatoms were obtained by the reaction of pyrazines and quinoxalines with indole and 1-methyl- and 2-methylindoles in the presence of acyl chlorides or acetic anhydride. See [1,2] for our preliminary communications. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 234–238, February, 1980.     

Vinylogous anhydro bases of pyridylindoles

The reaction of quaternary salts of pyridylindoles, the heterocyclic rings in which are separated by an ethylene grouping, with alkali was investigated. It was established that 2-(3-indolylvinyl)pyridinium and -quinolinium salts are converted to stable colored anhydro bases in a methanol solution of alkali.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1360–1364, October, 1980.     

Study of the products of oxidative rearrangement in the indole series by mass spectrometry

The principle pathways of dissociative ionization upon electron impact of 3-substituted 3-benzoylindoles are discussed. Alternative localization of the positive charge on the N or O atoms of the molecular ion determines the most probable pathways of its disintegration. The isomerization of the molecular ion and the existence of tautomeric forms in the starting molecule or in the molecular ion promote the appearance of low-intensity peaks that are valuable for identification purposes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1240–1244, September, 1974.     

Reactions of cyclammonium cations

The action of acylating agents on 2-methylquinoline gives extremely unstable N-acyl salts, which, as a result of hydride-ion capture, are converted to 1-acyl-2-methyl-1,2,3,4-tetrahydroquinolines. Under similar conditions, 1-acyllepidinium salts form 1-acyl-4-methyl-1,2-dihydroquinolines or dimerize.See [1] for communication XIXTranslated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1105–1110, August, 1972.