[en] In this study, the silicone thermal curing degree of the silicone-encapsulated quantum dot light emission diode was measured using the various types of chemical ligands around quantum dot. It was confirmed that the trioctyl phosphin oxide (TOPO) ligand around the quantum dot was responsible for dispersion of the quantum dot in silicone encapsulant and decline of the thermal curing degree of the silicone encapsulant. Also, it was confirmed that the thermal curing degree of silicone encapsulants containing the steric acid (SA) and the dodecanoic acid (DA) ligands were higher than the one of TOPO ligand

[en] The synergic extraction of rare earth(III) ions (RE; La, Sm, Tb and Lu) using 2-thenoyltrifluoroacetone (Htta) and phosphoryl-type uncharged bidentate ligands, such as tetraphenyldiphosphine dioxide (tpdpo) or bis(diphenylphosphinyl)methane (bdppm), was investigated in benzene. The synergic enhancement was attributed to the formation of the adduct RE(tta)₃S_n (n=1 or 2 for tpdpo and n=1 for bdppm) in benzene, where S denotes the uncharged ligand. The adduct formation constants (β_S) and the synergic extraction constants were determined. For each RE(III), the β_S,1 value for bdppm is larger than the β_S,1 and β_S,2 values for tpdpo and the β_S values for both ligands decrease with increasing atomic number of RE(III)

[en] Liquid chromatography with a free stationary phase (LCFSP, countercurrent chromatography) can be used to separate Am(III) and Eu(III) in systems with neutral bidentate organophosphorus extractants. If CHCl₃ solutions of tetraphenylmethylenediphosphine dioxide (TPMDPD) are used as the stationary phase, Eu(III) is first eluted by 0.5 M NH₄SCN-1 M HCl and then Am(III) by 0.025 M hydroxyethylidenediphosphonic acid (HEDPA) in water. If CHCl₃ solutions of 1,2,4-tris(diphenylphosphinylmethyl)benzene (1,2,4-TDPPMB) are used as the stationary phase, the elements are separated by elution with 3 M HNO₃ with Am eluting first. In both instances, 3-5 ml fractions contain 96-99% of one of the elements and no impurity of the other. 14 refs., 5 figs

[en] A series of organotin complexes was prepared involving phosphines bonded to the organotin moiety. The series include derivatives of SnCl_xPh_4-x (where x varied from zero to four with the phosphines Ph₃P, (Ph₂P)CH₂, (Ph₂P)₂(CH₂)₂, cis-(Ph₂P)CH₂, and CH₃C(CH₂PPh₂)₃. A host of new complexes was obtained, showing different stoichiometries, bonding modes, and coordination numbers around the tin atom. These complexes were characterized by several different chemical and physical methods. The ¹¹⁹Sn Moessbauer parameters varied differently. Whereas isomer shift values did not great variation for each group of complexs with the same organotin parent (SnCl_xPh_4-x), reflecting a small change in s charge distribution on the Sn atom upon complexation, quadrupole splitting results varied widely, however, when the parent organotin compound was wholly symmetric (SnCl₄ and SnPPh₄), the complexes also tended to show quadrupole splitting values approaching zero. (author)

[en] This paper is a review of the history, synthesis and application of organophosphorus compounds, especially of those of pentavalent phosphorus, such as phosphoramidates, phosphorothioates, phosphonates and phosphonic acids with insecticide and anticancer activities. The organophosphorus compounds with agrochemical applications show great structural variety, They include not only insecticides, but also fungicides, herbicides, and others. The large variety of commercially available organophosphorus pesticides is remarkable. Even more interesting is the high efficiency of some organophosphorus compounds as anticancer agents such as cyclophosphamide and its derivatives. (author)

[en] This is an exhaustive review of phosphorus-functionalized calix arenes. Effective methodologies are describes that allow preparation of derivatives with phosphate, phosphine oxide and P(III)-containing groups. It is shown that phosphoryl-containing calix arenes display interesting ionophoric properties, in particular with respect to the extraction and separation of lanthanides and actinides. (authors)

[en] The rare earth elements, compounds and complexes have evoked a great deal of interest because of their peculiar structure, properties and industrial and biochemical importance. In the present paper, we present the analysis of various XANES features of the L-absorption edges of Dy complexes with ligands of biological importance (viz. acetylacetone (acac), ethylacetoacetate (eaa), triphenyl phosphine oxide thiocyanate (tppo)(NCS), dipyridyl nitrate (dipy)(NO₃), triphenyl phosphine oxide nitrate (tppo)(NO₃), etc.) Such a study is helpful in understanding the behaviour of the Dy(III) ion and its biological applications. ((orig.))

No abstract available

[en] Splitting due to tunnelling via the potential energy barrier has played a significant role in the study of molecular spectra since the early days of spectroscopy. The observation of the ammonia doublet led to attempts to find a phosphine analogous, but these have so far failed due to its considerably higher barrier. Full dimensional, variational nuclear motion calculations are used to predict splittings as a function of excitation energy. Simulated spectra suggest that such splittings should be observable in the near infrared via overtones of the ν₂ bending mode starting with 4ν₂.

[en] To decreasing quantity of the contaminated equipment from the nuclear installation decommissioning activity, it can be done by decontamination. Its process must be done by considering of radiation safety so that not dangerous to worker and environment. Effectively method must be chosen so that not generate high of secondary wastes. To primary decontamination of HETRON tank with a chemical method is not effectively to used because its a reinforcement thermoplastic materials. These material has high resistance for chemical compound. Therefore selected methods of physical-mechanical decontamination, that is can to removal of contaminants from the surface by scrubbing and swabbing with used of wet cloth have been tried and effective to decreasing of β/γ radiation rate until about (0.04 - 0.06 mR/h), its value is equal to background rate and the level of α/β radiation activity contamination is about (1.07 - 2.03 Bq/cm²), so that it can be out grouping as radioactive waste. For the equipment of which cannot decontaminated, it grouped as solid radioactive waste and together with secondary waste will be sent to PTLR-BATAN. (author)