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A Monometallic Bis(cyaphido) Complex
Madeleine C Levis1, Monte L Helm1,2, John F C Turner1
1Department of Chemistry, University of Sussex, Brighton, UK.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 10, 2024
Summary
Researchers synthesized and characterized the first bis(cyaphido) complex, trans-[Ru(dppe)2(C≡P)2]. This work demonstrates the stability and synthetic accessibility of multiple cyaphido ligands in ruthenium complexes.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Phosphorus Chemistry
Background:
- Cyaphido ligands (C≡P) are novel phosphorus-containing analogues of cyano ligands (C≡N).
- The coordination chemistry and electronic properties of cyaphido ligands are not well understood.
- Previous studies have focused on monocyaphido complexes.
Purpose of the Study:
- To synthesize and characterize the first bis(cyaphido) complex.
- To investigate the synthetic accessibility and stability of complexes with multiple cyaphido ligands.
- To compare the electronic properties of cyaphido and cyano ligands.
Main Methods:
- Synthesis of trans-[Ru(dppe)2(C≡P)2] from [Ru(dppe)2(C≡P)]+ via coordination and desilylation of Me3SiC≡P.
- Synthesis of the heteroleptic analogue trans-[Ru(dppe)2(C≡N)(C≡P)] from the same cation and NaCN.
- Structural characterization of the synthesized complexes using X-ray crystallography and spectroscopic methods.
Main Results:
- The first bis(cyaphido) complex, trans-[Ru(dppe)2(C≡P)2], was successfully synthesized and characterized.
- The study demonstrates the synthetic feasibility and stability of ruthenium complexes bearing multiple cyaphido ligands.
- Direct comparison reveals that the cyaphido ligand exhibits enhanced π-acidity and higher π-donor character compared to the cyano ligand.
Conclusions:
- Bis(cyaphido) complexes are synthetically accessible and stable.
- The cyaphido ligand possesses distinct electronic properties compared to its isoelectronic analogue, the cyano ligand.
- This work expands the scope of organometallic chemistry involving phosphorus-containing ligands.
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