X-ray diffraction study of MgCl<sub>2</sub>aqueous solutions

Caminiti, Ruggero; Licheri, G.; Piccaluga, G.; Pinna, G.

doi:10.1107/s0021889879011729

Cited by 90 publications

(103 citation statements)

References 9 publications

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“…The peak at 4.20 Ä derives from Mg -H2On (HUO" = second shell molecules as found previously [15,16]). …”

Section: A) Correlation Functionssupporting

confidence: 67%

“…The first derives from Mg -H20, interactions (con tributions at about 2.1 Ä, as found in [15] and [16]) and O -O interactions within the Perchlorate anion (contributions at about 2.36 Ä).…”

Section: A) Correlation Functionsmentioning

confidence: 93%

“…Unauthenticated Download Date | 5/11/18 5:48 AM CI -H20 one. The choice of magnesium was made also because, from previous studies carried out on this ion, well defined first and second coordination shells were obtained [15,16]. Nuclear magnetic resonance spectroscopic studies also can provide significant structural information on aqueous electrolyte solutions; in particular, the relaxation time of the 35C1 nucleus in the Perchlorate ion reveals the presence of contact ion pairs, while it is insensitive to solventseparated ion aggregation [12].…”

Section: Introductionmentioning

confidence: 99%

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An X-ray and NMR Study on Cerium(III) and Magnesium(II) Perchlorate Solutions

Caminiti¹,

Cerioni

Crisponi³

et al. 1988

Zeitschrift Für Naturforschung A

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A n X -ra y a n d N M R S tu d y o n C e r iu m ( I I I ) a n d M a g n e s iu m ( I I) P e r c h lo r a te S o lu tio n s R. Caminiti3, G. Cerioni6, G. Crisponi3, and P. Cuccaa a Istituto di Chimica Generale, Inorganica e Analitica, Via Ospedale 72, 09100 Cagliari (Italy). b Istituto di Chimica Farmaceutica e Tossicologica, Via Ospedale 72, 09100 Cagliari (Italy).Z. Naturforsch. 43 a, 317-325 (1988); received October 15, 1987 Metal-perchlorate solutions have been investigated by the X-ray scattering technique and 35C1 NMR spectroscopy. The aim of this work was to obtain structural information on the complex formation between the Cerium and the Perchlorate group and on the C104 -H20 interactions. The NMR data, the correlation functions and the analysis of the structure functions agree with the literature information about the Ce -(0C103). species present in aqueous solutions. Good agree ment with experimental data is achieved through a model in which the Perchlorate ions are bonded as monodentate ligands to the Cerium(III). No complex formation is confirmed for Mg(II). The cations also possess a second coordination shell of water molecules. Some indications have been obtained supporting the presence of C104 -H20 contacts.

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“…The peak at 4.20 Ä derives from Mg -H2On (HUO" = second shell molecules as found previously [15,16]). …”

Section: A) Correlation Functionssupporting

confidence: 67%

Section: A) Correlation Functionsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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An X-ray and NMR Study on Cerium(III) and Magnesium(II) Perchlorate Solutions

Caminiti¹,

Cerioni

Crisponi³

et al. 1988

Zeitschrift Für Naturforschung A

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“…The general characteristics of the approach have been described elsewhere (Caminiti, Licheri, Piccaluga & Pinna, 1978, 1979bLicheri, Piccaluga & Pinna, 1976); in it, the contribution of discrete interactions to the structure function is accounted for by using the Debye formula modified in such a way that a Gaussian-!ike distribution of interatomic distances can be introduced, while a uniform distribution of distances is described by the formula proposed by Narten & Levy (1969). The hydrated ions were considered independent in all the calculations, since the system does not show any notable tendency towards the formation either of ionic pairs or of complex aggregates.…”

Section: Resultsmentioning

confidence: 99%

X-ray diffraction study of aqueous SrCl₂solutions

Caminiti¹,

Musinu²,

Paschina³

et al. 1982

J Appl Crystallogr

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Two aqueous solutions of SrCI 2 of concentration 1.53 and 2-00 mol dm-3 have been investigated by X-ray diffraction. A model in which the Sr 2+ ion was considered as having eight nearest-neighbour water molecules at a distance of 2.64 ,/k and a second outer shell came out in best agreement with the experimental data. Octahedral water coordination for CI-ions has been confirmed in agreement with the results obtained by other X-ray studies.

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“…In order to get more detailed information than that given by the experimental G(r), the analysis based on the refinement of a model structure function was used [23][24], The contribution of discrete interactions to the structure function is accounted for by using the Debye formula modified to give a Gaussian like distribution of interatomic distances while a uniform distribution of distances is described by the formula propsed by Narten and Levy [25]. Least squares refinement of the model parameters were performed by the PUTSLR program [26] connected with the generalized least-squares LETA-GROP program [27]; the minimized function was (J = 27 (fobs («) -icalc(s)) 2 .…”

Section: Refinement Of the Structural Model In Solutionmentioning

confidence: 99%

A Comparative X-Ray Diffraction Study of Aqueous MnSO₄ and Crystals of MnSO₄·5H₂O

Caminiti

Marongiu

Paschina

1982

Zeitschrift Für Naturforschung A

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X-ray single crystal analysis of MnS04 • 5H2O shows that the manganese atoms are octahedral ly coordinated by oxygen atoms, four of which belong to water molecules and two to sulphate groups.A model derived from the crystal structure was fitted to the X-ray scattering intensities from aqueous MnS04. Good agreement with experimental data is achieved using a model in which Mn(H20)6-2(0S03)z +2 " 2z interacts with about ten water molecules and each sulphate ion with about seven water molecules.Analysis of X-ray [1-3] and neutron [4] diffraction data from concentrated aqueous salt solutions gives details about the environment of the ions and information about the geometry of the coordination polyhedra. This is particularly useful in the case of direct interaction between the anion and the cation, since information about their relative orientation cannot be obtained through other experimental techniques than diffraction; in the last several years contributions to the knowledge of complex-formation in solution have been provided by the analysis of halogen salt solutions [1,3,5] and recently by that of some sulphate salts, i.e. Shapovalow and Radchenko [10] examined diffraction data of dilute MnS04 solutions; their analysis was, however, limited to the first hydration sphere and no mention was made of cation-anion interaction, although an indication for its presence is suggested by the values of equilibrium constants [11]. We therefore undertook a detailed analysis of the diffraction data of two concentrated MnS04 solutions, which is reported in this paper, together with the single crystal structure determination of MnS04-5H20. Experimental and Data ProcessingMnS04 • H20 (Merck reagent grade) was dissolved in water to give a 2M (Sol. A) and a saturated Reprints request to Dr. Ruggero Caminiti, Istituto Chimico, Universitä di Cagliari, Via Ospedale 72, 09100 Cagliari, Italy.(Sol. B) solution. Mn + + and SO^-contents were determined by titrations with standard EDTA [12] and with a cation exchange resin (Dowex 50W-X8). The analytical results are given in Table 1. X-ray scattering data were obtained at 20i 1°C on a $ -& diffractometer using Moka radiation (wavelength X = 0.7107 Ä). A divergent beam was diffracted at the horizontal surface of the sample and then monochromatized by reflection from a curved quartz crystal. The observed range of scattering angles (2$) was from 3° to 134°, corresponding to the range 0.46 Ä -1 ^ 16.3 A -1 , where s= (4tt/A) sin $ is the scattering variable. The measured intensities were corrected for background, polarization and absorption [13], and smoothed by fourth differences [14], The Compton contribution was evaluated by a semiempirical method [15] in order to account for the monochromator discrimination. The corrected intensities were scaled to the independent scattering factor for the solution using both the analytical method

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X-ray diffraction study of MgCl₂aqueous solutions

Cited by 90 publications

References 9 publications

An X-ray and NMR Study on Cerium(III) and Magnesium(II) Perchlorate Solutions

An X-ray and NMR Study on Cerium(III) and Magnesium(II) Perchlorate Solutions

X-ray diffraction study of aqueous SrCl₂solutions

A Comparative X-Ray Diffraction Study of Aqueous MnSO₄ and Crystals of MnSO₄·5H₂O

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X-ray diffraction study of MgCl2aqueous solutions

Cited by 90 publications

References 9 publications

An X-ray and NMR Study on Cerium(III) and Magnesium(II) Perchlorate Solutions

An X-ray and NMR Study on Cerium(III) and Magnesium(II) Perchlorate Solutions

X-ray diffraction study of aqueous SrCl2solutions

A Comparative X-Ray Diffraction Study of Aqueous MnSO4 and Crystals of MnSO4·5H2O

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Product

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X-ray diffraction study of MgCl₂aqueous solutions

X-ray diffraction study of aqueous SrCl₂solutions

A Comparative X-Ray Diffraction Study of Aqueous MnSO₄ and Crystals of MnSO₄·5H₂O