XXV.—Some aliphatic compounds of arsenic

Dyke, Wilfred James Cecil; Davies, G. R.; Jones, William J.

doi:10.1039/jr9310000185

Cited by 14 publications

(5 citation statements)

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“…7 is due to a Eu3+ charge-transfer transition as observed for the 12 L compounds. Since the chargetransfer transition for Eu3+ in six coordination is situated around 250 nm [17], this agrees with earlier observations. tron-spectroscopic data.…”

supporting

confidence: 93%

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Electron Impact Investigation of the Molecules SeS(g) and TeSe(g) Under High‐Temperature Equilibrium Conditions

Grade

Wienecke

Rosinger

et al. 1983

Ber Bunsenges Phys Chem

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SeS(g) and TeSe(g) molecules, produced by Knudsen‐cell vaporization of the mixed HB/VIA‐systems ZnS/ZnSe and CdSe/CdTe, were studied by energy‐dispersive electron impact ionization. Analysis of ionization efficiency curves yields energy levels of excited ionic states of the molecule ions SeS+(g) and TeSe+ (g). The energy levels correlate with corresponding states of S 2+(g), Se 2+(g) and Te 2+(g) derived from independent photoelectron‐spectroscopic data. ‐ Thermodynamic analysis of the intensity data yields dissociation energies of the neutral and singly ionized species, standard enthalpies of formation, heats and equilibrium constants of the gas‐phase reaction \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm XY}({\rm g}) = \frac{1}{2}{\rm X}_2 ({\rm g}) + \frac{1}{2}{\rm Y}_2 ({\rm g})\,({\rm X} = {\rm Se and Y} = {\rm S},{\rm Te} $\end{document} as well as total and partial pressures for the ZnS/ZnSe‐system.

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supporting

confidence: 93%

“…Comparison of results for the latter three species with photoelectron-spectroscopic and photoionization data from the Refs. [17,18, shows satisfactory agreement.…”

Section: Figmentioning

confidence: 80%

Electron Impact Investigation of the Molecules SeS(g) and TeSe(g) Under High‐Temperature Equilibrium Conditions

Grade

Wienecke

Rosinger

et al. 1983

Ber Bunsenges Phys Chem

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“…Synthesis. Trimethylarsine was synthesized by the reaction of CH 3 Li (1.4 M solution in diethyl ether, Aldrich) with arsenic trichloride (BDH) and converted to AsMe 3 Cl 2 by treatment with a solution of chlorine gas in carbon tetrachloride . The compound was sublimed in vacuo, and its purity checked by reference to its 1 H NMR and Raman spectra …”

Section: Methodsmentioning

confidence: 99%

Molecular Structures of Pentamethylarsenic(V) and Trimethyldichloroarsenic(V) by Gas Electron Diffraction and ab Initio Calculations: Molecular Mechanics Calculations on Pentamethylarsenic(V), Pentaphenylarsenic(V), and Related Compounds

et al. 1998

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The molecular structures of AsMe5 and AsMe3Cl2 (Me = CH3) have been determined by gas electron diffraction and Hartree−Fock computations. Both molecules are found to have trigonal bipyramidal arrangements of the heavy atom skeleton. The bond distances (r a) for AsMe5 are As−Ceq = 197.5(3) pm and As−Cax = 207.3(4) pm; for AsMe3Cl2, As−Ceq = 192.5(2) pm and As−Clax = 234.9(3) pm. The coordination geometries and dimensions are compared with those of related molecules. Molecular mechanics calculations on the pentamethyl and pentaphenyl derivatives of P, As, Sb, and Bi reproduce the observed coordination geometries and indicate that the square pyramidal equilibrium structures of SbPh5 and BiPh5 are stabilized by Coulombic interactions between the ligands.

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“…Trimethylarsine forms an etherate with diethyl ether and cannot be separated from it by fractionation, but this difficulty can be overcome by carrying out the preparation in a higher ether. 6 In the present work the Grignard compound (in slight excess) was prepared in di-n-butyl ether and the arsenic trichloride, diluted by the same solvent or by xylene, added slowly with cooling. The reaction mixture was subsequently warmed to 45" C and maintained at that temperalure for 1 h. Excess of Grignard reagent was now destroyed by the addition of aqueous ammonium chloride, and the ethereal layer separated, washed, dried over anhydrous sodium sulphate and fractionated through a long column packed with glass beads.…”

Section: Methodsmentioning

confidence: 99%

The heat of formation of trimethylarsine

Long¹,

Sackman²

1956

Trans. Faraday Soc.

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In the combustion of trimethylarsine in oxygen under pressure the arsenic is converted to a mixture of oxides, part of which dissolves in the water formed to yield a solution containing both tri-and pentavalent arsenic. An accurate method for analysing the products has been devised, and the heat of combustion to arsenic trioxide, carbon dioxide and water determined to be 664.6 f 1.2 kcal/mole at 25" C. This corresponds to a heat of formation Qf of + 3.5 kcal/mole. The mean energy of dissociation of the arseniccarbon bonds is calculated to be 51.5 kcal. A value for the heat of formation of the free AsMe:! radical is derived.

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XXV.—Some aliphatic compounds of arsenic

Cited by 14 publications

References 0 publications

Electron Impact Investigation of the Molecules SeS(g) and TeSe(g) Under High‐Temperature Equilibrium Conditions

Electron Impact Investigation of the Molecules SeS(g) and TeSe(g) Under High‐Temperature Equilibrium Conditions

Molecular Structures of Pentamethylarsenic(V) and Trimethyldichloroarsenic(V) by Gas Electron Diffraction and ab Initio Calculations: Molecular Mechanics Calculations on Pentamethylarsenic(V), Pentaphenylarsenic(V), and Related Compounds

The heat of formation of trimethylarsine

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