Ion Ion Solvent Interactions in Solution .X. Group-2 Perchlorates in Water

James, DW; Cutler, PG

doi:10.1071/ch9860137

Cited by 13 publications

(17 citation statements)

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“…4) of Mg(C104)2 show no significant change of spectral parameters with respect to the solu tions of HCIO4. at the same concentrations; therefore no complex formation is remarked, in agreement with previous work [12,29].…”

Section: B) Nmr Datasupporting

confidence: 80%

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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Section: B) Nmr Datasupporting

confidence: 80%

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 similar feature was observed in Raman studies of aqueous Naperchlorate and Mg-perchlorate, which has been assigned to either a hot band and heavy oxygen species, 10 or the overtone of the 2 × ν 2 (E) at ∼465 cm −1 . 11,12 The dominant component appearing at ∼933 cm −1 ("peak 2") represents the isolated, weakly hydrated ClO 4 − species. 10,12 This species retains the T d symmetry because it is free of association with other ions in the solutions.…”

Section: Discussionmentioning

confidence: 99%

“…11,12 The dominant component appearing at ∼933 cm −1 ("peak 2") represents the isolated, weakly hydrated ClO 4 − species. 10,12 This species retains the T d symmetry because it is free of association with other ions in the solutions. Thus, we denote the integrated intensity below this component as I free .…”

Section: Discussionmentioning

confidence: 99%

“…To our knowledge, there is only one previous study on the ion paring of aqueous Ca(ClO 4 ) 2 solutions conducted under room temperature, which has detected the enhanced formation of SIPs toward higher concentration. 12 When temperature is decreased below zero, Mitterbock et al 13 has observed increased CIPs in the glassy state of the NaClO 4 −D 2 O system compared with that of room temperature. Because ion pairing is an ion-specific process, the case in NaClO 4 cannot be used to predict the behavior of Ca(ClO 4 ) 2 .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Formation of Solvent-Shared Ion Pairs in Aqueous Calcium Perchlorate Solution toward Saturated Concentration or Deep Supercooling Temperature and Its Effects on the Water Structure

Lobanov

Bai

et al. 2019

J. Phys. Chem. B

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As a candidate of Martian salts, calcium perchlorate ) 2 ] has the potential to stabilize liquid water on the Martian surface because of its hygroscopicity and low freezing temperature when forming aqueous solution. These two properties of electrolytes in general have been suggested to result from the specific cation−anion−water interaction (ion pairing) that interrupts the structure of solvent water. To investigate how this concentration-dependent and temperature-dependent ion pairing process in aqueous Ca(ClO 4 ) 2 solution leads to its high hygroscopic property and the extreme low eutectic temperature, we have conducted two sets of experiments. First, the effects of concentration on aqueous calcium perchlorate from 3 to 7.86 m on ion pairing were investigated using Raman spectroscopy. Deconvolution of the Raman symmetric stretching band (ν 1 ) of ClO 4 − showed the enhanced formation of solvent-shared ion pairs upon increasing salt concentration at room temperature. We have confirmed that the low tendency of forming contact ion pairs in concentrated solution contributes to the high hygroscopicity of the salt. Second, the near eutectic samples were studied as a function of temperature by both combined differential scanning calorimetry−Raman spectroscopic experiments and in situ X-ray diffraction. The number of solvent-shared ion pairs was found to increase with decreasing temperature when cooled below the temperature of maximum density of the solution, driven by a change in water toward an ice-like structure in the supercooled regime. The massive presence of solvent-shared ion pairs in turn limits the development of the long-range order in the tetrahedral networks of water molecules, which is responsible for the extremely low eutectic point and deep supercooling effects observed in the Ca(ClO 4 ) 2 −H 2 O system.

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“…IR spectroscopy was used in the region of the intrinsic vibrations n 1 and n 3 of the ClO 4 − ion to study the aqueous solutions of magnesium perchlorates (0.9 M and 3.0 M), calcium (0.7 M and 3.2 M) and strontium (0.5 M and 3.6 M). 4 Raman scattering and multinuclear NMR spectroscopy at a greater variation of solution concentration under study have permitted the establishment of two types of associations: solvent shared anion-cation complexes and contact anioncation complexes. The extent of association to solvent shared anion-cation complexes was found to increase in the series of Mg +2 < Ca +2 < Sr +2 .…”

Section: Examined the Atr-ftir Spectra Of Aqueous Naclo 4 Liclo 4 mentioning

confidence: 99%

Near Infrared Spectral Studies of Aqueous Solutions of Metal Perchlorates in Groups I A, II A, II B, III A and III B of the Periodic Table

Davidian

Kudrev

Myund

et al. 2014

Journal of Near Infrared Spectroscopy

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The purpose of this paper is to reach the maximum energy recovery or maximum cold stream outlet terminal temperature in plate fin heat exchanger (PFHE) with constant volume and heat transfer area for specified maximum pressure drop. This paper presents methodology in surface selection and design of PFHE where full pressure drop utilization is taken as design objective in constant heat exchanger volume and heat transfer area. Several kinds of PFHE with different fin type and geometries and different heat exchanger width, length and height could satisfy the constant volume and area condition. Setting maximum pressure drop could reduce these heat exchangers. While the fin type and dimension of each heat exchanger is extracted due to constant volume-area and pressure drop conditions respectively, the terminal temperature of the heat exchanger would be calculated utilizing thermo-hydraulic modeling of the PFHE. typical gas turbine regenerator is chosen as case study. The methodology is applied to this case s t u d y an d r e s u lt s a r e s h o w n . T h e s u r fa c e s w h i c h r es u l t i n m a x i m u m en e r g y r e c o v e r y a r e specified. In the cases in which energy recovery of some surfaces would be approximately the same, other parameters such as frontal area and flow length will be considered.

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Ion Ion Solvent Interactions in Solution .X. Group-2 Perchlorates in Water

Cited by 13 publications

References 0 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

Enhanced Formation of Solvent-Shared Ion Pairs in Aqueous Calcium Perchlorate Solution toward Saturated Concentration or Deep Supercooling Temperature and Its Effects on the Water Structure

Near Infrared Spectral Studies of Aqueous Solutions of Metal Perchlorates in Groups I A, II A, II B, III A and III B of the Periodic Table

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