CO-Induced Dinitrogen Fixation and Cleavage Mediated by Boron

Area of Science:

• Inorganic Chemistry
• Photochemistry
• Quantum Chemistry

Background:

• Understanding the reactivity of small molecules is crucial in chemistry.
• Boron compounds exhibit unique bonding and reactivity patterns.
• Matrix isolation techniques allow for the study of transient species.

Purpose of the Study:

• To investigate the reaction pathways of boron atoms with carbon monoxide and dinitrogen.
• To characterize novel boron-containing complexes and molecules.
• To explore the photochemical transformations of these species.

Main Methods:

• Matrix isolation spectroscopy in solid neon and nitrogen.
• Photochemical excitation using visible and UV light.
• Quantum chemical calculations (DFT, ab initio methods) for geometries, energies, and vibrational spectra.
• Electronic structure analysis using charge- and energy-partitioning methods.

Main Results:

• Formation of the end-on bonded NNBCO complex from boron, CO, and N2.
• Isomerization to the (η2-N2)BCO complex upon visible light excitation.
• UV light irradiation leads to N-N bond cleavage and formation of NBNCO and B(NCO)2 molecules.
• Calculations provide detailed insights into the structures and energetics of these species.

Conclusions:

• Novel boron-carbon-nitrogen-oxygen complexes and molecules have been synthesized and characterized.
• Photochemical reactions provide pathways for N-N bond activation and cleavage.
• Quantum chemical methods are essential for understanding the electronic structure and reactivity of these novel species.