Related Experiment Video
Updated: Apr 14, 2026
05:26
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
Published on: February 10, 2023
4.2K
A {Co4 O4 } Cubane Incorporated within a Polyoxoniobate Cluster.
Zhijie Liang1, Dongdi Zhang1, Pengtao Ma1
1Key Laboratory of Polyoxometalate Chemistry of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004 (P. R. China), Fax: (+86) 371-23886876.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 25, 2015
Summary
Researchers synthesized a novel octacobalt polyoxoniobate with a unique {Co(II)4Co(III)4} cluster. Magnetic studies revealed antiferromagnetic interactions within this complex inorganic material.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Solid-State Chemistry
Background:
- Polyoxoniobates are versatile inorganic clusters with diverse structures and properties.
- Cobalt-containing polyoxoniobates are of interest for their magnetic and catalytic potential.
Purpose of the Study:
- To synthesize and characterize a novel octacobalt-containing polyoxoniobate.
- To investigate the structural and magnetic properties of the new compound.
Main Methods:
- Hydrothermal synthesis
- Diffusion methods
- Single-crystal X-ray diffraction
- Magnetic susceptibility measurements
Main Results:
- A novel octacobalt polyoxoniobate, Na6K12[H2Co8O4(Nb6O19)4]·39H2O, was successfully prepared.
- The polyanion features a tetrameric assembly of Lindqvist-type [Nb6O19]8- fragments encapsulating a {Co(II)4Co(III)4} cluster.
- The {Co(II)4Co(III)4} cluster consists of a central {Co(III)4O4} cubane core surrounded by four Co(II) ions.
- Magnetic measurements indicated the presence of antiferromagnetic interactions within the compound.
Conclusions:
- The successful synthesis of this complex polyoxoniobate expands the family of known inorganic cluster compounds.
- The unique structural motif and observed antiferromagnetic interactions provide insights into the magnetic behavior of cobalt-oxygen clusters.
Related Concept Videos
02:42Ionic Crystal Structures
21.5K
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...
21.5K
02:58Crystal Field Theory - Octahedral Complexes
32.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
32.2K
02:42Valence Bond Theory
11.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.9K
02:34Structural Isomerism
22.6K
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,...
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,...
22.6K
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
48.8K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
48.8K
02:57Coordination Number and Geometry
20.1K
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.
20.1K