Towards low-valent calcium carbene complexes
(2024) KEMP20 20242Department of Chemistry
- Abstract
- Research of the recent years indicated that the heavy alkaline earth metals may possess a bonding behaviour similar to transition metals, where they are able to involve their d-orbitals in bonding. The exact nature of such bonds is still elusive and a point of discussion amongst researchers. To further study this, low- or zero-valent complexes of those metals are needed. The objective of this project work was the synthesis and characterization of a normal-valent, soluble calcium carbene complex which would be suitable for reduction to a low-valent species for further works. A partial success of this project was the synthesis and characterization of a free carbene ligand, which was then reacted with different calcium salts to form... (More)
- Research of the recent years indicated that the heavy alkaline earth metals may possess a bonding behaviour similar to transition metals, where they are able to involve their d-orbitals in bonding. The exact nature of such bonds is still elusive and a point of discussion amongst researchers. To further study this, low- or zero-valent complexes of those metals are needed. The objective of this project work was the synthesis and characterization of a normal-valent, soluble calcium carbene complex which would be suitable for reduction to a low-valent species for further works. A partial success of this project was the synthesis and characterization of a free carbene ligand, which was then reacted with different calcium salts to form normal-valent calcium carbene complexes. Due to insolubility, no analytical data could be obtained yet and therefore it cannot be stated with certainty that the calcium carbene complexes have been made at all. So far, all attempts to improve solubility, including counterion exchange and the synthesis of novel, bulky ligands with improved solubility properties, were unsuccessful. (Less)
- Popular Abstract
- The elements in the periodic table are grouped according to their physical and chemical properties. Transition metals can be traditionally distinguished from alkaline earth metals by how they form chemical bonds. In recent years, research has indicated that some alkaline earth metals are able to form bonds in way that was thought to be only possible for transition metals. This is of course interesting for fundamental research, where the goal is to aquire knowledge about how nature works, but also for applied research, because it means that alkaline earth metals, which are often cheaper and less toxic, could potentially replace transition metals for certain applications. In order to study this, a complex of an alkaline earth metal and an... (More)
- The elements in the periodic table are grouped according to their physical and chemical properties. Transition metals can be traditionally distinguished from alkaline earth metals by how they form chemical bonds. In recent years, research has indicated that some alkaline earth metals are able to form bonds in way that was thought to be only possible for transition metals. This is of course interesting for fundamental research, where the goal is to aquire knowledge about how nature works, but also for applied research, because it means that alkaline earth metals, which are often cheaper and less toxic, could potentially replace transition metals for certain applications. In order to study this, a complex of an alkaline earth metal and an organic molecule (a ligand) has to be made, in which the alkaline earth metal actually displays the bonding properties of a transition metal. In this complex, the alkaline earth metal, which usually occurs as a divalent cation, meaning it is positively charged, has to occur in a neutral, non-charged form, or at least less charged than usual. Such compounds are extremely sensitive and reactive, therefore their synthesis and characterization is not trivial. The aim of this project work was to make complexes of calcium (the alkaline earth metal) and a carbene (the ligand) which would be suitable for further reactions to make the calcium into the interesting neutral form. This was partly successful, however, due to difficulties with the solubility and handling of the complexes, reliable characterization was not possible. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9178671
- author
- Gleichauf, Luisa LU
- supervisor
- organization
- course
- KEMP20 20242
- year
- 2024
- type
- L3 - Miscellaneous, Projetcs etc.
- subject
- keywords
- organic chemistry, inorganic chemistry, calcium
- language
- English
- id
- 9178671
- date added to LUP
- 2024-12-12 10:15:18
- date last changed
- 2024-12-12 10:15:18
@misc{9178671,
abstract = {{Research of the recent years indicated that the heavy alkaline earth metals may possess a bonding behaviour similar to transition metals, where they are able to involve their d-orbitals in bonding. The exact nature of such bonds is still elusive and a point of discussion amongst researchers. To further study this, low- or zero-valent complexes of those metals are needed. The objective of this project work was the synthesis and characterization of a normal-valent, soluble calcium carbene complex which would be suitable for reduction to a low-valent species for further works. A partial success of this project was the synthesis and characterization of a free carbene ligand, which was then reacted with different calcium salts to form normal-valent calcium carbene complexes. Due to insolubility, no analytical data could be obtained yet and therefore it cannot be stated with certainty that the calcium carbene complexes have been made at all. So far, all attempts to improve solubility, including counterion exchange and the synthesis of novel, bulky ligands with improved solubility properties, were unsuccessful.}},
author = {{Gleichauf, Luisa}},
language = {{eng}},
note = {{Student Paper}},
title = {{Towards low-valent calcium carbene complexes}},
year = {{2024}},
}