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Computational Analysis of Transition Metal-Terminal Boride Complexes
Yavuz S Ceylan, Thomas R Cundari1
1Department of Chemistry and Center of Advanced Scientific Computing and Modeling, University of North Texas , 115 Union Circle, No. 305070, Denton, Texas 76203-5017, United States.
Computational analysis reveals that transition-metal terminal boride complexes feature weak metal-boron π bonds. These bonds are significantly less strong than those in analogous nitride complexes, indicating a polarized, acceptor-like ligand behavior.
Area of Science:
- Computational chemistry
- Inorganic chemistry
- Organometallic chemistry
Background:
- Terminal boride complexes are of interest in inorganic and organometallic chemistry.
- Understanding the nature of metal-boron bonding is crucial for predicting reactivity.
Purpose of the Study:
- To computationally investigate the structure and bonding in transition-metal terminal boride complexes.
- To quantify the extent of metal dπ-boron pπ bonding.
- To compare the metal-boron bond strength with analogous metal-nitride systems.
Main Methods:
- Density functional theory (DFT) calculations.
- Natural bond orbital (NBO) analysis.
- Multiconfiguration self-consistent field (MCSCF) calculations.
Main Results:
- Metal-boron π bonds are present but weak (∼3% bond shortening).
- Calculated π-bond strengths for borides are ≤22 kcal/mol, compared to 44 kcal/mol for nitrides.
- The metal-boron bond comprises a covalent σ bond and two highly polarized π bonds.
Conclusions:
- Terminal boride complexes exhibit weak metal-boron π interactions.
- The high polarization of π bonds suggests terminal boride acts as a Z-type (acceptor) ligand.
- Findings provide insights into the electronic structure and bonding of transition-metal borides.
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