Related Experiment Video
Updated: Jun 20, 2026
16:11
Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Acenaphthene-1,2-diimine chromium complexes.
Igor L Fedushkin1, Valentin M Makarov, Vladimir G Sokolov
1G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina str. 49, 603950, Nizhny Novgorod, Russian Federation. igorfed@iomc.ras.ru
Dalton Transactions (Cambridge, England : 2003)
|September 23, 2009
Summary
New chromium-magnesium complexes were synthesized and characterized. Researchers explored reactions involving chromium chloride and magnesium complexes, leading to novel mixed-metal compounds with potential paramagnetic properties.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
Background:
- The synthesis of novel mixed-metal complexes is crucial for advancing catalysis and materials science.
- Chromium and magnesium complexes offer unique electronic and structural properties.
Purpose of the Study:
- To synthesize and characterize novel mixed chromium-magnesium complexes.
- To investigate the reactivity of these complexes and their structural features.
Main Methods:
- Reactions of (dpp-BIAN)Mg(THF)3 and (dpp-BIAN)Na2 with CrCl3.
- Characterization using IR and electronic absorption spectroscopy.
- Magnetic susceptibility measurements (Evans method) and single-crystal X-ray diffraction.
Main Results:
- Synthesis of mixed chromium-magnesium complex (dpp-BIAN)Cr(mu-Cl)3Mg(THF)3 (2).
- Formation of dimeric [(dpp-BIAN)Cr(mu-Cl)(THF)]2 (3) and chlorine-free [Na(THF)6][(dpp-BIAN)2Cr] (4).
- Structural elucidation and confirmation of paramagnetic properties for complexes 2, 3, and 4.
Conclusions:
- Successful synthesis of novel paramagnetic chromium-magnesium complexes.
- Demonstrated reactivity of chromium chloride with magnesium precursors.
- Established molecular structures and magnetic properties provide a foundation for further research.
Related Concept Videos
01:19Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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...
02:34Structural 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...
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.
02:58Crystal Field Theory - Octahedral Complexes
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...