- Conductometric, Viscometric, and Spectroscopic Investigations on the Solvation Phenomena of Alkali-Metal Ions and Ion Pairs in 2-Methoxyethanol
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Precise measurements on electrical conductances, relative viscosities, and laser-Raman spectra of solutions of some alkali-metal salts in 2-methoxyethanol (ME) have been reported.The conductance data were analyzed by the 1978 Fuoss conductance equation an
- Das, Bijan,Hazra, Dilip K.
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- An improved method for product separation in metathetical reactions and its demonstration for the synthesis of anhydrous cesium salts
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In conventional metathetical reactions, product separation is based on solubility product differences, and the resulting products are often impure and require purification by recrystallization. A new approach to product separation is described that relies on the formation of an unstable, volatile by-product, such as NH4+CH3O-. This method provides very pure and anhydrous products in high yield and was demonstrated successfully for the syntheses of anhydrous cesium salts.
- Haiges, Ralf,Christe, Karl O.
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p. 1717 - 1718
(2008/10/08)
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- N,N-Dimethylthioamidecyanooximato Nickel(II) Complex Containing a Saturated Tetraamine Macrocycle, [Ni[13]aneN4{ONC(CN)C(S)N(CH3)2}]CIO 4: Synthesis, Spectra, and Structure
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The complex Ni[13]aneN4){TDCO}]CIO4, where [13]aneN4 is 1,4,7,10-tetraazacyclotridecane, and {TDCO-} is N,N-dimethylthioamidecyanooximato ion {ONC(CN)C(S)N(CH3)2}-, was synthesized and characterized by IR and electronic spectroscopy and X-ray diffraction. The complex is triclinic, space group P1?, with a = 9.619(2) ?, b = 9.929(2) ?, c = 11.827(2) ?, α = 99.37(3)°, β = 97.71(3)°, γ = 95.99(3)°, Z = 2, V = 1095.2(4) ?3, pcalc = 1.518 g/cm3. The structure was refined to R = 0.057 and wR2 = 0.142. The structure is ionic and consists of Ni[13]aneN4){TDCO}]+ complex cations and ClO4- anions. The central atom has slightly distorted octahedral coordination. The acido ligand is coordinated through the nitroso nitrogen and thioamide sulfur to form a five-membered chelate ring (Ni-N 2.072(4) ?, Ni-S 2.389(2) ?). The tetraaza macrocycle adopts the bent conformation and is coordinated via four nitrogen atoms, two in the equatorial plane and two in axial positions (Ni-N 2.069(4)-2.139(4) ?).
- Domasevich,Ponomareva,Skopenko,Zan,Siler
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p. 1014 - 1018
(2008/10/08)
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- The heat of dissolution of CsClO4 in mixtures of water and glycols
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The enthalpies of solution of CsClO4 (m = 0.002-0.02) in aqueous solutions of mono-, di-, tri-, and tetraethylene glycols and polyethylene glycols 300,400, and 600 with glycol contents up to 30 wt % were determined at 298.15 K using an isotherm
- Manin,Krasnoperova,Korolev
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p. 545 - 550
(2007/10/03)
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- Transfer Gibbs energies for ClO3-, BrO3-, IO3-, ClO4- and IO4- anions for water-methanol and water-propan-2-ol mixtures: Some quantum-chemical aspects of ionic solvation
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The transfer Gibbs energies, ΔtrsG°, of KClO3, KBrO3, KIO3, KClO4, KIO4 and the corresponding caesium salts have been obtained through gravimetric measurements of the solubility in aqueous mixtures with methanol (MeOH) and propan-2-ol (PriOH) at 298.2 K. In addition, the solubility of Ph4P(pic) (pic = picrate anion) as well as K(pic) and KBPh4 and the corresponding caesium salts are reported in these mixtures at 298.2 K. Single-ion values of ΔtrsG° have been calculated using the tetraphenylphosphonium tetraphenylborate (TPTB) assumption. The semiempirical quantum-chemical AM1 method was used for calculations of interaction energy of BPh4- and Ph4P+ with a series of five solvent molecules and energy demands associated with a deformation of these ions. Trends observed for ΔtrsG° are discussed in terms of specific ion-solvent interactions and the structural effect of solvent mixtures.
- Benko, Jan,Vollarova, Ol'ga,Cernusak, Ivan,Pappova, Adriana
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p. 4935 - 4941
(2007/10/03)
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