Properties of Organic Solutions of Heavy Metal Soaps.

Pilpel, N.

doi:10.1021/cr60223a001

Cited by 96 publications

(48 citation statements)

References 39 publications

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“…Some general features can, however, be described. Firstly, the solubilities of the saturated metal carboxylates at room temperature are generally low, but increase dramatically above a certain temperature [13,16,31,44]. This critical temperature shares many of the characteristics of the Krafft point observed with aqueous surfactants [26,31], but probably has a different origin.…”

Section: Introductionmentioning

confidence: 96%

“…They are, in general, insoluble in water, but dissolve in a variety of organic solvents. Although these sys-tems have been extensively studied for over 90 years , and a number of reviews have been presented [44][45][46][47][48], there is still a shortage of information on the nature of the aggregates present, which limits the development of good models of the solution behaviour. Some general features can, however, be described.…”

Section: Introductionmentioning

confidence: 99%

“…The solubility behaviour depends on the metal ion, chain length of the carboxylate, the presence of any substituents, and the solvent [31,44,47,48]. These properties may also be dramatically affected by the presence of any water [22,32,44], and in some cases, gelation may occur [32,44].…”

Section: Introductionmentioning

confidence: 99%

“…These properties may also be dramatically affected by the presence of any water [22,32,44], and in some cases, gelation may occur [32,44]. With the branched chain copper(II) 2-ethylhexanoate, gel formation has been observed even in the absence of water [35,36].…”

Section: Introductionmentioning

confidence: 99%

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Solution behaviour of lead(II) carboxylates in organic solvents

Miguel

Pereira

Proença

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The solution behaviour has been studied of a series of even chain length lead(II) carboxylates (octanoate to octadecanoate) and the odd chain length lead(II) heptadecanoate in a variety of non-complexing organic solvents and in alcohols. In agreement with previous studies, solubility increases dramatically above a certain temperature, which depends on solute concentration, chain length and solvent. This solution temperature is also affected by traces of water. These results are complemented by studies using vapour pressure osmometry, dynamic light scattering, 1 H and 13 NMR spectroscopy. The results in water-free systems are consistent with the formation of rather ill-defined, polydisperse aggregates, which increase in size with concentration and decrease with temperature. These show similar local structure to lamellar mesophases in the pure lead(II) carboxylates, and are suggested to be formed by solvent induced swelling and break-up of these mesophases. In the presence of water, a more ordered structure is formed, in which a few water molecules are suggested to be bound to the lead(II) carboxylate headgroup.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solution behaviour of lead(II) carboxylates in organic solvents

Miguel

Pereira

Proença

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Although these systems have been widely studied and reviewed [16][17][18][19][20], most of the publications are relatively old. In addition, there is not much information about the phase separation mechanism, or the structures of the solutions, which complicates the development of models of such systems.…”

Section: Introductionmentioning

confidence: 99%

The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions

Pereira¹,

Valente²

2014

Journal of Colloid and Interface Science

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The interaction of sodium octanoate, decanoate or dodecanoate with lead(II) has been studied in aqueous solutions using potentiometry, electrical conductivity, turbidity and ICP-OES measurements. These show an alkyl chain length dependence on the behaviour. At the lead(II) concentration used (1.0 mM), relatively strong interactions are observed with the decanoate and dodecanaote, leading to formation of the lead carboxylates (soaps) as insoluble complexes. Association constants of the complexes have been determined from potentiometric measurements and are consistent with data on solubility products. A comparison is made of the effect of surfactant head group on the interactions with lead(II) using two surfactants with the same chain length: dodecanoate and dodecylsulfate. Differences in their interactions with this metal ion in aqueous solutions are interpreted in terms of greater covalency of the bond between the metal and the carboxylate than with the sulfate group.

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Cryoenzymology in Aqueous Media

Douzou¹

1980

Advances in Enzymology - And Related Areas of Molecular Biology

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Properties of Organic Solutions of Heavy Metal Soaps.

Cited by 96 publications

References 39 publications

Solution behaviour of lead(II) carboxylates in organic solvents

Solution behaviour of lead(II) carboxylates in organic solvents

The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions

Cryoenzymology in Aqueous Media

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