Interaction of dicyclopentadienyltitanium dichloride with bis(triethylgermyl)-cadmium and -mercury

The reaction of dicyclopentadienyltitanium dichloride with bis(triethylgermyl)mercury in benzene solution at 20° yields metallic mercury quantitatively, titanocene monochloride and triethylchlorogermane. The reaction of dicyclopentadienyltitanium dichloride with bis(triethylgermyl)cadmium leads to the formation of a complex of the following general composition: [Cp₂TiCl₂ - Cd(GeEt₃)₂]. The reactivity of this complex has been studied: in toluene solution at 20° it decomposes slowly to yield metallic cadmium, triethylchlorogermane and Cp₂TiCl(GeEt₃).     

Methyl 3,3,3-trifluoro-2-diazopropionate for the synthesis of functionalized styrenes

The efficient method for the synthesis of novel trifluoromethyl-containing hydroxy- and aminostyrenes has been developed. The reaction sequence includes the selective insertion of CF₃-substituted carbene, which was catalytically derived from methyl 3,3,3-trifluoro-2-diazopropionate, into the OH- or NH-bonds of easily available o-bromophenol and o-bromoaniline derivatives followed by a bromine substitution for vinyl group via Pd-catalyzed Stille reaction.     

Structural frustration and occupational disorder: the rare earth metal polysulfides Tb8S(14.8), Dy8S(14.9), Ho8S(14.9), and Y8S(14.8)

Dark red crystals of Y?S(14.8), Tb?S(14.8), Dy?S(14.9), and Ho?S(14.9) have been obtained following different reaction routes. The isostructural title compounds adopt the Gd?Se?? type, a 24-fold superstructure of the ZrSSi-type and can be described in space group A112 (non standard setting of C121, no. 5) with lattice parameter of a = 11.505(1) ?, b = 15.385(1) ?, c = 15.726(1) ?, and γ = 90.21(2)° for Y?S(15-x); a = 11.660(1) ?, b = 15.468(2) ?, c = 15.844(2) ?, and γ = 90.19(2)° for Tb?S(15-x); a = 11.584(1) ?, b = 15.340(2) ?, c = 15.789(2) ?, and γ = 90.34(2)° for Dy?S(15-x); and a = 11.538(1) ?, b = 15.288(2) ?, c = 15.740(2) ?, and γ = 90.23(1)° for Ho?S(15-x), respectively. The structure consists of an alternating stacking of puckered [RES] (RE, rare-earth metals) double slabs and planar sulfur layers along [001]. The planar sulfur layers have a complex arrangement of S?2? dinuclear dianions, isolated S2? ions, and vacancies. All compounds contain trivalent rare-earth metal ions, for Tb?S(15-x) and Dy?S(15-x) antiferromagnetic order was found at T(N) = 5.4(2) K and 3.8(1) K, respectively. Short wavelength cutoff optical band gaps of 1.6 to 1.7 eV were determined.     

Efficient method for the synthesis of dideoxyuridine-5′-triphosphate fluorescent derivative

An approach to the synthesis of a fluorescent labeled dideoxyuridine triphosphate derivative using the pentafluorophenyl ester of a dicarbocyanine dye was suggested. The use of the dye pentafluorophenyl ester instead of N-oxysuccinimidyl one has the advantage of giving significantly higher yield of the fluorescent labeled dideoxyuridine-5??-triphosphate derivative.     

Interferometric study of the growth kinetics of K2Co(SO4)2 · 6H2O and K2Ni(SO4)2 · 6H2O crystals

Crystallography Reports - The growth kinetics of the (001) and (110) faces of K2Co(SO4)2 · 6H2O and K2Ni(SO4)2 · 6H2O crystals in the kinetic mode has been in situ investigated for the...     

Influence of temperature on the adsorption of α-tocopherol from ethanol solutions on acid-activated clinoptilolite tuff

Patterns in the adsorption of α-tocopherol on acid-activated clinoptilolite tuff at 283, 295, 305, and 333 K are established and explained. It is found that the selectivity of the sorbent toward the vitamin rises as the temperature of the process falls. The adsorption of α-tocopherol from dilute solutions is described in terms of the Langmuir adsorption theory. It is shown that the fixing of vitamin E monolayers in the structural matrix of clinoptilolite tuff is due to the formation of hydrogen bonds between isolated silanol groups of the adsorbent and oxygen atoms of the chromane ring and the phenol residue of α-tocopherol. The thermodynamic functions of monolayer adsorption of the vitamin are estimated. It is concluded that the formation of polymolecular layers in the form of associates is due to hydrophobic interactions between side substituents of α-tocopherol.     

Study of the Radial Heterogeneity and Mosaic Microheterogeneity in KCNSH Mixed Crystals

Crystallography Reports - Mixed crystals of potassium?cobalt sulfate hexahydrate/potassium?nickel sulfate hexahydrate (K2Co(SO4)2 · 6H2O/K2Ni(SO4)2 · 6H2O (KCNSH)) have been...     

Dimerization of Phthalate Ion in Non-Aqueous Solvents

Russian Journal of General Chemistry - Solutions of tetraethylammonium phthalate in non-aqueous solvents (ethanol, dimethylsulfoxide, dimethylformamide, and acetonitrile) were studied by electronic...     

True detection limit of rare earth elements in atomic emission analysis with an arc two-jet plasmatron

The “true detection limit” C_L,true was measured by a method proposed by Boumans et al. for 10 prominent lines of La, Ce, Pr, Nd and Sm, the most abundant rare earth elements (REEs) in geological samples. It is demonstrated how spectral interferences can increase of C_L,true. The spectra were excited in an argon arc plasma jet with evaporation powders of five complex natural samples. The data show that there is a significant increase of C_L,true in real samples containing large concentrations of such elements as Ti, Zr, Cr, Nb, Ta and REEs emitting complex spectra.