Related Experiment Video
Updated: Apr 28, 2026
10:42
Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10.0K
Magnesium(0) complexes and their reduction reactions with binary transition metal carbonyls
Yixiao Jiang1, Maryam Niksefat1, Sophie G Unsworth1
1School of Chemistry, Monash University PO Box 23 VIC 3800 Australia http://www.monash.edu/science/research-groups/chemistry/jonesgroup.
Chemical Science
|April 27, 2026
Summary
Bulky beta-diketimine ligands were used to synthesize magnesium iodide complexes. Reduction reactions yielded novel magnesium(0) and mixed-valent magnesium compounds, including those with transition metal carbonyl fragments.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Main Group Chemistry
Background:
- Beta-diketimine (Nacnac) ligands are versatile scaffolds in coordination chemistry.
- Exploring bulky Nacnac ligands can influence the coordination environment and reactivity of metal centers.
- Magnesium complexes, particularly low-valent ones, are of interest due to their unique electronic properties and potential applications.
Purpose of the Study:
- To synthesize novel, bulky beta-diketimine protio-ligands and their corresponding magnesium iodide complexes.
- To investigate the reduction chemistry of these magnesium complexes.
- To explore the reactivity of magnesium(0) complexes with transition metal carbonyls.
Main Methods:
- Synthesis of three bulky beta-diketimine protio-ligands (TCHP, DCHP, TCHP/Dip).
- Preparation of monomeric, three-coordinate beta-diketiminato magnesium iodide complexes.
- Reduction reactions using sodium metal and computational analyses (DFT) to characterize the resulting magnesium complexes and their electronic structures.
- Reactions of magnesium(0) complexes with transition metal carbonyls (Cr, Mo, Mn, Fe).
Main Results:
- Successfully synthesized bulky beta-diketimine ligands and magnesium iodide complexes.
- Isolated a thermally robust anionic magnesium(0) complex [{(TCHP Nacnac)Mg}Na]2 (6) via sodium metal reduction.
- Obtained a mixed oxidation state magnesium compound [{(TCHP/Dip Nacnac)Mg}2Mg] (7) and a related compound [{(TCHP Nacnac)Mg}2Mg] (8).
- Synthesized new complexes incorporating metal-metal single or double bonded metal carbonyl fragments via reactions of magnesium(0) compound 6 with Cr, Mo, and Mn carbonyls.
- Prepared a Collman's reagent analogue [{(TCHP Nacnac)Mg}Na{Fe(CO)4}]2 (12) from the reaction of 6 with Fe(CO)5.
Conclusions:
- The steric bulk of beta-diketimine ligands significantly influences the outcome of reduction reactions of magnesium complexes.
- Novel magnesium(0) and mixed-valent magnesium compounds were synthesized and characterized.
- The magnesium(0) complex serves as a valuable precursor for synthesizing new organometallic compounds featuring metal-metal bonds and unique main group-transition metal interactions.
Related Concept Videos
01:14Acid Halides to Ketones: Gilman Reagent
3.2K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the...
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the...
3.2K
01:23Properties of Organometallic Compounds
2.0K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
2.0K
03:02Colors and Magnetism
12.0K
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...
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...
12.0K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
992
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
992
02:23Alcohols from Carbonyl Compounds: Reduction
9.3K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat...
9.3K
03:45Formation of Complex Ions
18.8K
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...
18.8K