Related Experiment Video
Updated: Jun 1, 2026
09:12
Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
Published on: August 10, 2017
Poly[[1-(2-pyrid-yl)ethanone-κN,O]di-μ(2)-thio-cyanato-κN:S;κS:N-cadmium(II)]
1Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721007, People's Republic of China.
Summary
This study details the crystal structure of a cadmium compound, [Cd(NCS)(2)(C(7)H(7)NO)](n), revealing a six-coordinated cadmium ion. The structure forms infinite sheets due to bridging thiocyanate ions.
Area of Science:
- Coordination Chemistry
- Crystal Engineering
- Materials Science
Background:
- Understanding the coordination behavior of metal ions like Cadmium (Cd2+) is crucial for designing novel materials.
- Thiocyanate (NCS-) and organic ligands offer versatile coordination modes that influence crystal structures.
- The specific ligand 1-(2-pyridylethyl)ethanone (C7H7NO) has not been extensively studied in cadmium complexes.
Purpose of the Study:
- To synthesize and characterize a novel cadmium coordination compound using 1-(2-pyridylethyl)ethanone and thiocyanate ligands.
- To elucidate the coordination environment around the Cd(2+) ion and the resulting crystal structure.
- To investigate the role of bridging thiocyanate ions in the formation of extended structures.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
- Elemental analysis confirmed the stoichiometry of the synthesized compound.
- Infrared spectroscopy was used to identify the coordination modes of the ligands and thiocyanate ions.
Main Results:
- The title compound, [Cd(NCS)(2)(C(7)H(7)NO)](n), features a six-coordinated Cd(2+) ion.
- The coordination sphere consists of one N,O-bidentate 1-(2-pyridylethyl)ethanone ligand, two N-bonded thiocyanate ions, and two S-bonded thiocyanate ions.
- The crystal structure exhibits a distorted CdOS(2)N(3) octahedron with a facial arrangement of nitrogen atoms, forming infinite sheets parallel to the (101) plane due to bridging thiocyanate ions.
Conclusions:
- The coordination chemistry of Cd(2+) with 1-(2-pyridylethyl)ethanone and thiocyanate results in a unique layered structure.
- Bridging thiocyanate ligands are key to the formation of extended 2D networks in this cadmium complex.
- The study provides insights into the structure-property relationships of cadmium-based coordination polymers.
More Related Videos
Related Concept Videos
01:22EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
01:20Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...