541-43-5Relevant articles and documents
Synthesis and characterization of dibarium iron(II) formate tetrahydrate
Vassileva, Violeta Z.
, p. 57 - 62 (2003)
The Ba(HCOO)2-Fe(HCOO)2-H2O system has been studied by the solubility method at 25 °C and formation of a new double salt with composition Ba2Fe(HCOO)6·4H2O was established. The double salt has been characterized by X-ray powder diffraction and thermal analysis. Ba2Fe(HCOO)6·4H2O is isostructural with the double salts Ba2Me(HCOO)6·4H2O (Me = Co, Ni, Cu, and Zn) and crystallizes in the triclinic system (space group PI?) with lattice parameters a = 8.902(3) A?, b = 7.125(2) A?, c = 6.901(3) A?, α = 98.85(5)°, β = 108.81(4)°, and γ = 82.47(3)°. The presence of two steps in the thermal dehydration process of the double salt has been established by means of DSC at lower heating rates. The enthalpy of dehydration has been determined.
Properties of systems Ba(HCOO)2-M(HCOO)2-H 2O (M = Ca or Mg) at 25°C
Vasileva
, p. 1221 - 1224 (2003)
The systems Ba(HCOO)2-Ca(HCOO)2-H2O and Ba(HCOO)2-Mg(HCOO)2-H2O were studied at 25°C by the solubility method. The effect of the ionic radii of doubly charged metals on the formation of dou
Double formates Ba2M(HCOO)6(H2O) 4 (M = Co, Ni, Cu, Zn): Crystal structures and hydrogen bonding systems
Baggio,Stoilova,Polla,Leyva,Garland
, p. 173 - 180 (2007/10/03)
The crystal structures of four members in the isomorphous series, Ba 2M(HCOO)6(H2O)4 (M=Co, Ni, Cu, Zn) are presented and thoroughly discussed. Discrepancies with a previous structural report on the Cu isolog [Z. Kristallogr. 110 (1958) 231] were cleared out through a re-refinement of the original data, the outcome of which definitely confirmed the present results. The strengths of the hydrogen bonds in the title compounds as deduced from the infrared wavenumbers of the uncoupled OD stretches of matrix-isolated HDO molecules are discussed in terms of the O w?O hydrogen bond lengths, the different hydrogen bond acceptor capabilities of the formate oxygen atoms and the weak Ba-OH2 interactions. The proton acceptor strength of the oxygen atoms is evaluated within the framework of the Brown's bond-valence theory. The intramolecular OH bond lengths are derived from the novel νOD vs. rOH correlation curve [J. Mol. Struct. 404 (1997) 63].
Solubility and composition of solid phases in Ba(HCOO)2-Zn(HCOO)2-H2O system at 25°C
Fakeev,Samofalova,Iskhakova,Zhadanov
, p. 187 - 191 (2007/10/03)
The solubility in the Ba(HCOO)2-Zn(HCOO)2-H2O system was studied at 25°C in a wide range of component concentrations. The composition of solid phases was determined by chemical and X-ray analyses and by IR spectroscopy. The unit cell parameters of Ba(HCOO)2, Zn(HCOO)2 · 2H2O, and Ba2Zn(HCOO)6 · 4H2O were refined.
Catalytic hydrolysis of alkylene oxides
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, (2008/06/13)
A process for the preparation of alkylene glycols by reacting an alkylene oxide with water in the presence of a catalytic composition comprising a macrocyclic chelating compound complexed with an ionic compound the anion of which is catalytically effective under the reaction conditions. Preferably, the macrocycle is a crown ether or a cryptate and the anion is selected from the group of halogenides, carboxylates having from 1-20 carbon atoms, hydrogen carbonate, hydrogen sulphite, hydrogen phosphate and metalates.
Consistency of NMR and mass spectrometry determinations of natural- abundance site-specific carbon isotope ratios. The case of glycerol
Zhang,Trierweiler,Jouitteau,Martin
, p. 2301 - 2306 (2007/10/03)
Quantitative determinations of natural-abundance carbon isotope ratios by nuclear magnetic resonance (SNIF-NMR) have been optimized by appropriate selection of the experimental conditions and by signal analysis based on a dedicated algorithm. To check the consistency of the isotopic values obtained by NMR and mass spectrometry (IRMS) the same glycerol samples have been investigated by both techniques. To have access to site-specific isotope ratios by IRMS, the products have been degraded and transformed into two derivatives, one of which contains carbons 1 and 3 and the other carbon 2 of glycerol. The sensitivity of the isotopic parameters determined by IRMS to fractionation effects possibly occurring in the course of the chemical transformations has been investigated, and the repeatability and reproducibility of both analytical chains have been estimated. The good agreement observed between the two series of isotopic results supports the reliability of the two different approaches. SNIF-NMR is therefore a very attractive tool for routine determination, in a single nondestructive experiment, of the carbon isotope distribution in glycerol, and the method can be applied to other compounds. Using this method, the isotopic distributions have been compared for glycerol samples, obtained from plant or animal oils, extracted from fermented media, or prepared by chemical synthesis. Typical behaviors are characterized.
IR study of dibarium copper formate tetrahydrate
Stoilova,Koleva
, p. 291 - 295 (2007/10/03)
The infrared spectra of Ba2Cu(HCOO)6·4H2O and its deuterated analogues have been recorded and the internal modes of the formate groups and water molecules are reported. Some of the internal formate modes (v4, v
