Search results for "Thallium"
showing 7 items of 37 documents
Development of an Isotope Dilution Mass Spectrometric Method for Dimethylthallium Speciation and First Evidence of Its Existence in the Ocean
1999
A sensitive analytical method for the determination of dimethyl thallium (Me2Tl+) in environmental samples by positive thermal ionization isotope dilution mass spectrometry (PTI-IDMS) was developed...
Isostructural Potassium and Thallium Salts of Sterically Crowded Thio‐ and Selenophenols: A Structural and Computational Study
2008
Because of their similar cationic radii, potassium and thallium(I) compounds are usually regarded as closely related. Homologous molecular species containing either K+ or Tl+ are very rare, however. We have synthesized potassium and thallium salts MEAr* [M, E = K, S (2a); K, Se (2b); Tl, S (3a); Tl, Se (3b); Ar* = 2,6-Trip2C6H3, Trip = 2,4,6-iPr3C6H2] derived from terphenyl-substituted thio- and selenophenols. In the solid-state structures of dimeric 2a, 2b, 3a, and 3b additional metal-ηn–π-arene interactions to the flanking arms of the terphenyl substituents of different hapticity n are observed. Remarkably, the homologous potassium and thallium complexes 2b and 3b crystallize in isomorpho…
The study of myocardial viability after myocardial infarction: Valve and limitations of magnetic resonance imaging compared with myocardial scintigra…
1997
International audience; Abstract: The aim of this study was to compare myocardial thickness measured by magnetic resonance imaging and quantified fixation of thallium. Twenty-one patients 61.2+/-11 years were investigated after myocardial infarction of the anterior wall in 8 cases, inferior in 10 cases, lateral in 2 cases and apical in one case. The mean angiographic ejection fraction was 46.5 +/- 19 %. Myocardial scintigraphy was performed after an exercise or pharmacological stress test and followed by a study of redistribution. The data was analysed by a quantitative method. Magnetic resonance imaging was performed with Vertical and horizontal long axis views in systole and diastole with…
Spectroscopic studies of Tl containing high frequency electrodeless lamps
2014
In this work we estimate gas temperature from OH rotational spectrum at 306.4 nm and C 2 Swan band at 516.5 nm in thallium containing lamps during two working regimes: stable generation and self-modulation regime. The usage of both molecules allowed us to estimate gas temperature in different zones of the discharge. The measurement results show that the central part of discharge has temperature higher for about 400 K than in vicinity of lamp inner walls. The measurement results of self-modulation regime showed that rotational temperature variations are similar to that of atomic and molecular spectral line intensities with period being around 1 minute. More detailed analysis of temporal beha…
�ber Thallium(I)-monoalkylcarbonate
1971
Thallium in Wein — Spurenelement-Vinogramm des Thalliums
1984
Das Ultra-Spurenelement Thallium ist regelmasig in geringsten Gehalten in Wein enthalten, in Rotwein durchschnittlich 0,2 μg Tl/l, mehr als in Weisweinen mit durchschnittlich 0,1 μg Tl/l. Uber Herkunft und Verhalten solcher geringsten Thallium-Gehalte konnen einige Hinweise aus den zusatzlichen Untersuchungen (Boden, Standort, Dungemittel, Einflus der Kellertechnik) gegeben werden. Eine Korrelation von Thallium mit Kalium ist bekannt; es kann aber daruber hinaus gezeigt werden, das ahnlich dem Rubidium gewisse Traubenteile (Beere, Beerenfleisch, Schale) reicher an Thallium sind und auf diese Weise hohere Gehalte, insbesondere in Rotweinen, erklart werden konnen. Geringfugig hohere Thallium-…
Complexes of organometallic compounds
1972
Abstract The novel organobismuth(V) derivatives Ph 3 BiCl(Ox) and Ph 3 BiBr(Ox) (Ox − = 8-quinolinate) have been synthesized, and their configuration investigated in the solid state and in solution. The complexes are assumed to be octahedral in the solid, with Ox − acting as a chelating base and the halide atoms coordinating to bismuth. Tentative assignments of infrared bands in the 300–80 cm −1 region to BiHal and other skeletal modes are proposed. The main effect of solvents appears to be the weakening and breaking of BiN-bonds.