Surface tension reduction (STR) in aqueous solutions of anionic surfactants with cobalt(III) complexes

Sieng Sovanna; Takayoshi Suzuki; Masaaki Kojima; Satoshi Tachiyashiki; Masakazu Kita

doi:10.1016/j.jcis.2008.12.005

Surface tension reduction (STR) in aqueous solutions of anionic surfactants with cobalt(III) complexes

Sieng Sovanna, Takayoshi Suzuki, Masaaki Kojima, Satoshi Tachiyashiki, Masakazu Kita

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

It has been observed that, at 25.0 ± 0.1 ° C, [Co(NH₃)₆](ClO₄)₃, [Co(en)₃](ClO₄)₃, [Co(bpy)₃](ClO₄)₃, and [Co(phen)₃](ClO₄)₃ in the regions of 1.25-5.00 mM aqueous solutions cause a significant surface tension reduction (STR) of water by the surfactants, sodium dodecylsulfate (SDS) and sodium dodecylbenzenesulfonate (SBS), suggesting the formation of the 1:1 and 1:2 association complexes, {[complex]³⁺(S^-)}²⁺ and {[complex]³⁺(S^-)₂}⁺ where [complex]³⁺ = [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺, [Co(bpy)₃]³⁺, or [Co(phen)₃]³⁺, S^- = DS^- or BS^-. The effect of [Co(en)₃]³⁺ on STR in SDS-water system is the largest due to a strong hydrophilic interaction between amino protons of [Co(en)₃]³⁺ and sulfate oxygen atoms of DS^-. The effects of [Co(en)₃]³⁺, [Co(bpy)₃]³⁺, and [Co(phen)₃]³⁺ on STR in SBS-water system are significant and almost same, meaning that the hydrophilic interaction between [Co(en)₃]³⁺ and the sulfonate group is comparable to the hydrophobic interaction between [Co(bpy)₃]³⁺ or [Co(phen)₃]³⁺ and the phenyl group of BS^-. The Co(III) complexes of 1.25-5.00 mM are precipitated as {[complex]³⁺(S^-)₃} at 0.0295-0.173 mM of S^-. The precipitates, {[Co(bpy)₃]³⁺(S^-)₃} and {[Co(phen)₃]³⁺(S^-)₃} can be dissolved at higher molar ratio of [S^-]/[complex³⁺] than 3.5 for SDS and 4.0 for SBS. This observation suggests that the aggregated premicelle [Co(bpy or phen)₃]₂(DS)^-₇ or aggregated premicelle [Co(bpy or phen)₃](BS)^-₄ is formed.

Original language	English
Pages (from-to)	194-200
Number of pages	7
Journal	Journal of Colloid And Interface Science
Volume	332
Issue number	1
DOIs	https://doi.org/10.1016/j.jcis.2008.12.005
Publication status	Published - Apr 1 2009

Keywords

Co(III) complexes
Hydrophilic interaction
Hydrophobic interaction
Sodium dodecylbenzenesulfonate
Sodium dodecylsulfate
Surface tension

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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10.1016/j.jcis.2008.12.005

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@article{9330c35149b7470592abcf274dd96f8f,

title = "Surface tension reduction (STR) in aqueous solutions of anionic surfactants with cobalt(III) complexes",

abstract = "It has been observed that, at 25.0 ± 0.1 ° C, [Co(NH3)6](ClO4)3, [Co(en)3](ClO4)3, [Co(bpy)3](ClO4)3, and [Co(phen)3](ClO4)3 in the regions of 1.25-5.00 mM aqueous solutions cause a significant surface tension reduction (STR) of water by the surfactants, sodium dodecylsulfate (SDS) and sodium dodecylbenzenesulfonate (SBS), suggesting the formation of the 1:1 and 1:2 association complexes, {[complex]3+(S-)}2+ and {[complex]3+(S-)2}+ where [complex]3+ = [Co(NH3)6]3+, [Co(en)3]3+, [Co(bpy)3]3+, or [Co(phen)3]3+, S- = DS- or BS-. The effect of [Co(en)3]3+ on STR in SDS-water system is the largest due to a strong hydrophilic interaction between amino protons of [Co(en)3]3+ and sulfate oxygen atoms of DS-. The effects of [Co(en)3]3+, [Co(bpy)3]3+, and [Co(phen)3]3+ on STR in SBS-water system are significant and almost same, meaning that the hydrophilic interaction between [Co(en)3]3+ and the sulfonate group is comparable to the hydrophobic interaction between [Co(bpy)3]3+ or [Co(phen)3]3+ and the phenyl group of BS-. The Co(III) complexes of 1.25-5.00 mM are precipitated as {[complex]3+(S-)3} at 0.0295-0.173 mM of S-. The precipitates, {[Co(bpy)3]3+(S-)3} and {[Co(phen)3]3+(S-)3} can be dissolved at higher molar ratio of [S-]/[complex3+] than 3.5 for SDS and 4.0 for SBS. This observation suggests that the aggregated premicelle [Co(bpy or phen)3]2(DS)-7 or aggregated premicelle [Co(bpy or phen)3](BS)-4 is formed.",

keywords = "Co(III) complexes, Hydrophilic interaction, Hydrophobic interaction, Sodium dodecylbenzenesulfonate, Sodium dodecylsulfate, Surface tension",

author = "Sieng Sovanna and Takayoshi Suzuki and Masaaki Kojima and Satoshi Tachiyashiki and Masakazu Kita",

year = "2009",

month = apr,

day = "1",

doi = "10.1016/j.jcis.2008.12.005",

language = "English",

volume = "332",

pages = "194--200",

journal = "Journal of Colloid and Interface Science",

issn = "0021-9797",

publisher = "Academic Press Inc.",

number = "1",

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TY - JOUR

T1 - Surface tension reduction (STR) in aqueous solutions of anionic surfactants with cobalt(III) complexes

AU - Sovanna, Sieng

AU - Suzuki, Takayoshi

AU - Kojima, Masaaki

AU - Tachiyashiki, Satoshi

AU - Kita, Masakazu

PY - 2009/4/1

Y1 - 2009/4/1

N2 - It has been observed that, at 25.0 ± 0.1 ° C, [Co(NH3)6](ClO4)3, [Co(en)3](ClO4)3, [Co(bpy)3](ClO4)3, and [Co(phen)3](ClO4)3 in the regions of 1.25-5.00 mM aqueous solutions cause a significant surface tension reduction (STR) of water by the surfactants, sodium dodecylsulfate (SDS) and sodium dodecylbenzenesulfonate (SBS), suggesting the formation of the 1:1 and 1:2 association complexes, {[complex]3+(S-)}2+ and {[complex]3+(S-)2}+ where [complex]3+ = [Co(NH3)6]3+, [Co(en)3]3+, [Co(bpy)3]3+, or [Co(phen)3]3+, S- = DS- or BS-. The effect of [Co(en)3]3+ on STR in SDS-water system is the largest due to a strong hydrophilic interaction between amino protons of [Co(en)3]3+ and sulfate oxygen atoms of DS-. The effects of [Co(en)3]3+, [Co(bpy)3]3+, and [Co(phen)3]3+ on STR in SBS-water system are significant and almost same, meaning that the hydrophilic interaction between [Co(en)3]3+ and the sulfonate group is comparable to the hydrophobic interaction between [Co(bpy)3]3+ or [Co(phen)3]3+ and the phenyl group of BS-. The Co(III) complexes of 1.25-5.00 mM are precipitated as {[complex]3+(S-)3} at 0.0295-0.173 mM of S-. The precipitates, {[Co(bpy)3]3+(S-)3} and {[Co(phen)3]3+(S-)3} can be dissolved at higher molar ratio of [S-]/[complex3+] than 3.5 for SDS and 4.0 for SBS. This observation suggests that the aggregated premicelle [Co(bpy or phen)3]2(DS)-7 or aggregated premicelle [Co(bpy or phen)3](BS)-4 is formed.

AB - It has been observed that, at 25.0 ± 0.1 ° C, [Co(NH3)6](ClO4)3, [Co(en)3](ClO4)3, [Co(bpy)3](ClO4)3, and [Co(phen)3](ClO4)3 in the regions of 1.25-5.00 mM aqueous solutions cause a significant surface tension reduction (STR) of water by the surfactants, sodium dodecylsulfate (SDS) and sodium dodecylbenzenesulfonate (SBS), suggesting the formation of the 1:1 and 1:2 association complexes, {[complex]3+(S-)}2+ and {[complex]3+(S-)2}+ where [complex]3+ = [Co(NH3)6]3+, [Co(en)3]3+, [Co(bpy)3]3+, or [Co(phen)3]3+, S- = DS- or BS-. The effect of [Co(en)3]3+ on STR in SDS-water system is the largest due to a strong hydrophilic interaction between amino protons of [Co(en)3]3+ and sulfate oxygen atoms of DS-. The effects of [Co(en)3]3+, [Co(bpy)3]3+, and [Co(phen)3]3+ on STR in SBS-water system are significant and almost same, meaning that the hydrophilic interaction between [Co(en)3]3+ and the sulfonate group is comparable to the hydrophobic interaction between [Co(bpy)3]3+ or [Co(phen)3]3+ and the phenyl group of BS-. The Co(III) complexes of 1.25-5.00 mM are precipitated as {[complex]3+(S-)3} at 0.0295-0.173 mM of S-. The precipitates, {[Co(bpy)3]3+(S-)3} and {[Co(phen)3]3+(S-)3} can be dissolved at higher molar ratio of [S-]/[complex3+] than 3.5 for SDS and 4.0 for SBS. This observation suggests that the aggregated premicelle [Co(bpy or phen)3]2(DS)-7 or aggregated premicelle [Co(bpy or phen)3](BS)-4 is formed.

KW - Co(III) complexes

KW - Hydrophilic interaction

KW - Hydrophobic interaction

KW - Sodium dodecylbenzenesulfonate

KW - Sodium dodecylsulfate

KW - Surface tension

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U2 - 10.1016/j.jcis.2008.12.005

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M3 - Article

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SN - 0021-9797

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Surface tension reduction (STR) in aqueous solutions of anionic surfactants with cobalt(III) complexes

Abstract

Keywords

ASJC Scopus subject areas

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