Related Experiment Video
Updated: May 3, 2026
10:42
Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10.1K
Isocyanide and Phosphine Oxide Coordination in Binuclear Chromium Pacman Complexes
Charlotte J Stevens1, Gary S Nichol1, Polly L Arnold1
1EaStCHEM School of Chemistry, University of Edinburgh , West Mains Road, Edinburgh EH9 3JJ, U.K.
Organometallics
|February 4, 2014
Summary
Researchers synthesized a novel binuclear chromium complex, [Cr2(L)], and explored its reactivity. The complex forms new coordination compounds with isocyanides and phosphine oxide donors, showcasing distinct chemical behaviors.
Area of Science:
- Inorganic Chemistry
- Coordination Chemistry
- Macromolecular Chemistry
Background:
- Schiff base macrocycles are versatile ligands in coordination chemistry.
- Binuclear metal complexes offer unique reactivity and structural possibilities.
Purpose of the Study:
- To synthesize and structurally characterize a new binuclear chromium complex, [Cr2(L)], derived from a pyrrole Schiff base macrocycle (H4L).
- To investigate the reactivity of the [Cr2(L)] complex with different donor ligands, specifically isocyanides and triphenylphosphine oxide.
- To elucidate the contrasting coordination modes and resulting structures upon addition of these donors.
Main Methods:
- Synthesis of the binuclear chromium complex [Cr2(L)] from H4L.
- Structural characterization using appropriate analytical techniques (e.g., X-ray crystallography, spectroscopy).
- Reactions of [Cr2(L)] with isocyanides (C≡NR) and triphenylphosphine oxide (OPPh3).
Main Results:
- Successful synthesis and structural confirmation of the binuclear chromium Pacman complex [Cr2(L)].
- Formation of [Cr2(μ-CNR)(L)] complexes where isocyanides bridge the two Cr(II) centers.
- Formation of [Cr2(OPPh3)2(L)] complexes, an adduct with exogenous triphenylphosphine oxide ligands.
Conclusions:
- The binuclear chromium Pacman complex [Cr2(L)] exhibits differential reactivity towards isocyanide and phosphine oxide ligands.
- Isocyanides act as bridging ligands between the two Cr(II) centers, forming new coordination compounds.
- Triphenylphosphine oxide coordinates as an exogenous adduct, highlighting the complex's versatile coordination environment.
More Related Videos
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
2.8K
08:46Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
Published on: November 22, 2016
7.3K
Related Concept Videos
02:34Structural Isomerism
16.8K
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,...
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,...
16.8K
02:54Coordination Compounds and Nomenclature
21.1K
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...
21.1K
02:42Valence Bond Theory
8.9K
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...
8.9K
02:51Metal-Ligand Bonds
19.3K
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...
19.3K
02:57Coordination Number and Geometry
15.6K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.6K
02:52Stereoisomerism
11.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.1K