Related Experiment Video
Updated: Feb 8, 2026
07:20
Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
14.5K
Alkali metal complexes based on bisheterocyclomethanide ligands
Johannes Kretsch1, Anne Kreyenschmidt, Regine Herbst-Irmer
1Institut für Anorganische Chemie, Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany. dstalke@chemie.uni-goettingen.de.
Dalton Transactions (Cambridge, England : 2003)
|July 5, 2018
Summary
New alkali metal complexes featuring deprotonated bisheterocyclomethanide ligands were synthesized. These compounds exhibit remarkable stability in water, opening avenues for their use in deep eutectic solvents.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Bisheterocyclomethanide ligands offer unique coordination properties.
- Alkali metal complexes are crucial in various chemical transformations.
- Understanding the stability and reactivity of organometallic compounds is essential.
Purpose of the Study:
- To synthesize and characterize novel alkali metal complexes with deprotonated bisheterocyclomethanide ligands.
- To investigate the structural and spectroscopic properties of these new complexes.
- To evaluate the water stability and reactivity of the synthesized organopotassium compounds.
Main Methods:
- Synthesis of alkali metal complexes via deprotonation of bis-(benzoxazol-2-yl)methane.
- Structural characterization using single crystal X-ray diffraction.
- Spectroscopic analysis including various NMR techniques.
- Water NMR titration experiments to assess hydrolysis stability.
Main Results:
- Successfully synthesized and characterized lithium and potassium complexes.
- X-ray diffraction revealed a nearly planar ligand chelating the alkali metal ion.
- NMR studies confirmed the structures in solution.
- Compounds 2 and 3 demonstrated significant water stability, indicating reactive organopotassium species.
Conclusions:
- The synthesized alkali metal complexes possess a stable chelating bisheterocyclomethanide ligand.
- Organopotassium compounds 2 and 3 are notably stable in the presence of water.
- The hydrolysis stability of these complexes makes them promising candidates for further investigation in deep eutectic solvents.
Related Concept Videos
03:06Alkali Metals
24.9K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.9K
02:51Metal-Ligand Bonds
24.4K
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...
24.4K
03:45Formation of Complex Ions
26.2K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
26.2K
02:58Crystal Field Theory - Octahedral Complexes
30.9K
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...
30.9K
02:40Ligand Binding Sites
15.1K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
15.1K
00:49Ligand Binding and Linkage
5.6K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
5.6K