Related Experiment Video
Updated: Jun 1, 2026
08:40
Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
Published on: April 28, 2014
Aqua{5,5'-dimethoxy-2,2-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato}nickel(II)
1Department of Chemistry, Jiaying University, Meizhou 514015, People's Republic of China.
Summary
A novel mononuclear nickel(II) complex with a Schiff base ligand was synthesized and characterized. This square-pyramidal complex exhibits crystallographic mirror symmetry and forms chains through hydrogen bonding in the crystal structure.
Area of Science:
- Coordination Chemistry
- Inorganic Chemistry
- Crystallography
Background:
- Schiff base ligands are versatile in coordinating with metal ions.
- Nickel(II) complexes have diverse applications in catalysis and materials science.
- Understanding the structural properties of metal complexes is crucial for predicting their behavior.
Purpose of the Study:
- To synthesize and characterize a novel mononuclear nickel(II) complex.
- To elucidate the coordination geometry and crystal structure of the complex.
- To investigate intermolecular interactions within the crystal lattice.
Main Methods:
- Synthesis of the nickel(II) complex using a Schiff base ligand.
- Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.
- Spectroscopic characterization (e.g., IR, UV-Vis) to confirm the complex's identity.
Main Results:
- The mononuclear nickel(II) complex, [Ni(C(18)H(18)N(2)O(4))(H(2)O)], was successfully synthesized.
- The nickel(II) ion exhibits a five-coordinate, square-pyramidal geometry.
- The crystal structure reveals intermolecular O-H⋯O hydrogen bonds linking molecules into chains along the a axis.
Conclusions:
- The synthesized nickel(II) complex possesses a unique square-pyramidal coordination geometry.
- The crystal packing is influenced by intermolecular hydrogen bonding, leading to chain formation.
- This structural insight contributes to the understanding of Schiff base nickel(II) complexes.
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...
01:03Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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...
00:43Complexometric Titration: Ligands
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...
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...
02:54Coordination 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...