Reactions of dithiocarbamic acids derived from alkaloids, morpholine, and piperidine with acrylic acid and its derivatices

-(Thiocarbamoylthio)propionic acids derived from alkaloids, morpholine, and piperidine and their esters, amides, and nitriles were prepared by reactions of the corresponding dithiocarbamic acids with acrylic acid and its derivatives. Some of the compounds were tested for insecticidal activity.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 8, 2004, pp. 1336–1339.Original Russian Text Copyright © 2004 by Zhivotova, Gazaliev, Ibraev, Fazylov, Kasenov.     

Kinetics of long-lived luminescence of eosin in Langmuir-Blodgett films

The spectral and kinetic properties of photoluminescence of mixed Langmuir-Blodgett (LB) films of eosin decyl ether and palmitic acid on a solid substrate are studied. The electronic absorption and fluorescence spectra of the films are identical to the spectra of the dye in ethanol. An increase in the dye concentration in a monolayer results in the appearance of a dimer absorption band, quenching of fluorescence of monomers, and the red shift of the spectral bands. At 90 K, the distinct phosphorescence and delayed fluorescence bands of LB films were observed. The decay kinetics of phosphorescence and delayed fluorescence is nonexponential. It is shown that the decay curve of delayed fluorescence is determined by triplet-triplet annihilation (TTA) and T ₁→S₁ triplet-singlet intersystem crossing (IS). The initial nonexponential phosphorescence decay is caused the dominant contribution of TTA to the decay of triplet molecules. The experimental data are interpreted based on the mechanisms of exchange-resonance and inductive-resonance annihilation.     

The effect of chromophore-chromophore interaction on the spectral luminescent properties of oxazine dye dimers

Spectral and luminescent properties were studied for chemical dimers and molecular aggregates of Nile Red oxazine dye in solutions. Chemical bonding of two oxazine dye molecules leads to the formation of a dimer whose spectral behavior is in close agreement with the exciton model constructed for “physical” molecular aggregates. Chemical dimers luminesce, whereas dimers formed because of van der Waals interactions do not.     

Decay kinetics of the delayed annihilation fluorescence of aromatic molecules in Langmuir-Blodgett films

Triplet states of aromatic molecules of the anthracene type in Langmuir-Blodgett films are investigated. It is established that the principal channel for the relaxation of T ₁ states is bimolecular triplet-triplet annihilation. The observed nonexponential decay kinetics of delayed annihilation fluorescence is discussed within the formal-kinetic and percolation models. Fiz. Tverd. Tela (St. Petersburg) 41, 736–739 (April 1999)     

Role of contact complexes in singlet-triplet energy transfer

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 48, No. 3, pp. 453–458, March, 1988.     

Synthesis and crystal structure of (4S,5R)-2-[2-(hydroxyethyl)imino]-3,4-dimethyl-5-phenyl-1,3-thiazolidine

Acid hydrolysis of l-N-[N′-(2-vinyloxy)ethylcarbamothioyl]ephedrine was studied. The synthesized (4S,5R)-2-[2-(hydroxyethyl)imino]-3,4-dimethyl-5-phenyl-1,3-thiazolidine was studied by means of X-ray diffraction.     

Synthesis and molecular structure of 2-hydroxy-2-(p-nitrophenyl)ethyl morpholine-4-carbodithioate

2-Hydroxy-2-(p-nitrophenyl)ethyl morpholine-4-carbodithioate was synthesized by reaction of p-nitrophenyloxirane with carbon disulfide and morpholine, and its molecular structure was studied by the X-ray diffraction method.