What the study found
The calculations suggest that the heteroleptic carbones L1-C-L2 are generally stable enough to be experimentally observed. Most of these complexes are predicted to have bent equilibrium structures, with two exceptions that are linear.
Why the authors say this matters
The authors conclude that comparing heteroleptic carbones with homoleptic species helps show how carbon-ligand bonds change when the two ligands are different. The study suggests that these bond changes are controlled by several factors rather than by bond length alone.
What the researchers tested
The researchers carried out quantum chemical calculations using density functional theory at the BP86-D3(BJ)/def2-TZVPP level and ab initio theory at the CCSD(T)/def2-TZVPP level. They studied heteroleptic carbones with ligands L1 and L2 chosen from PPh3, SPh2, CO, CS, NHCMe, and CAACMe, and they compared them with homoleptic species L1-C-L1 and L2-C-L2.
What worked and what didn't
Bond dissociation energy calculations indicate that all heteroleptic carbones considered in the work are stable enough to be experimentally observed. The analysis also shows no direct correlation between bond-length changes and carbon-ligand bond dissociation energy. In general, weaker bonds in homoleptic complexes are strengthened in heteroleptic carbones, while stronger bonds are weakened; however, this is not quantitatively correlated, and mutual strengthening can occur.
What to keep in mind
The summary available here does not describe experimental confirmation, only computational predictions. It also does not provide a detailed limitation section beyond noting that bond strength is influenced by several factors.
Key points
- Most heteroleptic carbones L1-C-L2 are predicted to have bent equilibrium structures.
- N2-C-CS and OC-C-CS are the exceptions reported as linear.
- Bond dissociation energy calculations suggest the studied heteroleptic carbones are stable enough to be experimentally observed.
- Bond-length changes do not show a direct correlation with carbon-ligand bond dissociation energy.
- Pauli repulsion often has a stronger effect on carbon-ligand interactions than attractive orbital interactions.
- Weaker homoleptic bonds are often strengthened in heteroleptic carbones, while stronger ones are often weakened, but not in a quantitatively simple way.
Disclosure
- Research title:
- Heteroleptic carbones are predicted to be stable and often bent
- Authors:
- Ya Hu, Jiayi Chen, Ma Qin, Lili Zhao, Gernot Frenking
- Institutions:
- Nanjing Tech University, Philipps University of Marburg, Donostia International Physics Center
- Publication date:
- 2026-04-20
- OpenAlex record:
- View
- Image credit:
- Photo by Tara Winstead on Pexels · Pexels License
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