Related Experiment Video
Updated: May 1, 2026
15:39
Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
Published on: February 28, 2017
7.7K
Poly[bis-(μ(3)-dodecyl sulfato)-calcium]
Genta Sakane1, Masahiro Tomohara, Yasuhiro Katayama
1Department of Chemistry, Okayama University of Science, Ridai-cho, Okayama 700-0005, Japan.
Summary
This study reveals the crystal structure of calcium dodecyl sulfate, showing Ca(II) ions coordinated by sulfate anions in layered hydrocarbon structures interacting via van der Waals forces.
Area of Science:
- Materials Science
- Crystallography
- Coordination Chemistry
Background:
- Calcium dodecyl sulfate is an ionic surfactant with potential applications in material science.
- Understanding its crystal structure is crucial for predicting its bulk properties and behavior.
Purpose of the Study:
- To elucidate the crystal structure of calcium dodecyl sulfate.
- To describe the coordination environment of calcium ions and the arrangement of dodecyl sulfate anions.
Main Methods:
- Single-crystal X-ray diffraction was used to determine the crystal structure.
- Analysis of atomic positions and coordination geometry.
Main Results:
- The crystal structure features a unique Ca(II) ion located on an inversion center.
- The Ca(II) ion is octahedrally coordinated by six oxygen atoms from dodecyl sulfate anions.
- The structure is characterized by hydrocarbon layers of dodecyl sulfate sandwiching the Ca(II) ions, with parallel zigzag chains interacting via van der Waals forces.
Conclusions:
- The crystal structure of calcium dodecyl sulfate is characterized by layered arrangements and van der Waals interactions.
- This structural understanding provides insights into the self-assembly and properties of calcium-based surfactants.
Related Concept Videos
02:42Ionic Crystal Structures
18.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
18.0K
04:01Factors Affecting Solubility
32.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
32.2K
03:46Qualitative Analysis
21.9K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
21.9K
01:19Ionic Strength: Effects on Chemical Equilibria
2.9K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
2.9K
00:43Complexometric Titration: Ligands
2.5K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.5K
01:29Sulfate Attack on Concrete
1.1K
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
Sulfates from sources like soil, groundwater, or industrial effluents...
1.1K