Related Experiment Video
Updated: Jun 1, 2026
16:11
Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Tris(2,2'-bipyridine)-nickel(II) hexa-molybdate
Summary
This study details the crystal structure of a novel nickel-bipyridine complex with a Lindqvist-type polyoxometalate anion. Researchers elucidated the coordination environment of nickel ions and the specific bonding within the polyoxometalate structure.
Area of Science:
- Inorganic Chemistry
- Crystallography
- Materials Science
Background:
- Polyoxometalates (POMs) are versatile inorganic clusters with diverse applications.
- Transition metal complexes, such as those involving nickel and bipyridine, are crucial in catalysis and coordination chemistry.
- Understanding the assembly and properties of hybrid materials combining POMs and metal complexes is key to developing new functional materials.
Purpose of the Study:
- To synthesize and characterize a novel hybrid compound containing a nickel-bipyridine complex and a Lindqvist-type polyoxometalate.
- To determine the detailed crystal structure of the title compound, [Ni(C(10)H(8)N(2))(3)][Mo(6)O(19)].
- To analyze the coordination geometry of the nickel ion and the structural features of the polyoxometalate anion.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
- Analysis of bond lengths and angles provided insights into the coordination environment and bonding characteristics.
- Investigation of intermolecular interactions, such as C-H⋯O hydrogen bonds, was performed to understand crystal packing.
Main Results:
- The asymmetric unit contains a tris(2,2'-bipyridine)nickel(II) cation and a Lindqvist-type hexamolybdate(VI) anion.
- The nickel(II) ion is coordinated by six nitrogen atoms from three chelating 2,2'-bipyridine ligands in a distorted octahedral geometry.
- The Lindqvist-type [Mo(6)O(19)](2-) anion exhibits characteristic Mo-O bond lengths, with distinct terminal and central oxygen bond distances.
- Crystal packing is influenced by C-H⋯O interactions between the organic ligands and the polyoxometalate anions.
Conclusions:
- The successful synthesis and structural characterization of the title compound provide a new example of hybrid inorganic-organic materials.
- The study highlights the coordination behavior of nickel(II) with 2,2'-bipyridine ligands in the presence of a bulky polyoxometalate anion.
- The detailed structural analysis contributes to the understanding of structure-property relationships in polyoxometalate-based hybrid materials.
Related Concept Videos
02:42Valence Bond Theory
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...
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.
02:34Structural 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...
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.