BRGN · Boron Radical Route to Green Nitrogen: Mechanistic Elucidation and Closing the Synthetic Cycle

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Project objective

Dinitrogen (N2) is an essential resource for life, agriculture, pharmaceuticals, and materials science, yet its inertness, due to high bond dissociation energy (941 kJ/mol) and a large HOMO-LUMO gap (10.8 eV), makes activation and conversion a major scientific challenge. The energy-intensive Haber-Bosch process, which supports global agriculture, consumes 1-2% of world energy and contributes significantly to CO2 emissions, highlighting the urgent need for sustainable alternatives.Inspired by nitrogenases, recent advances have expanded nitrogen fixation beyond transition metals to main-group elements. A paradigm shift occurred in 2018 with the first boron-based molecular activation of N2, and more recently, the host group achieved metal-free, radical-mediated conversion of N2 to borylamines under mild conditions. However, key mechanistic aspects remain unresolved: radical intermediates are unisolated, uncharacterized, and poorly understood beyond computational predictions.This MSCA project aims to address these gaps by elucidating the mechanism of boron-radical-mediated N2 activation. We will design novel Lewis acids and radical capture agents to isolate and characterize key intermediates such as [R2B-N2]• and [(R2B)2N]• using multimodal analysis (XRD, NMR, EPR, UV-vis, and DFT). Furthermore, the project will demonstrate the release of green nitrogen products (NH₃ and organonitrogens) via electrophilic functionalization and establish a closed synthetic cycle, contributing to sustainable chemistry aligned with EU Critical Raw Materials priorities.By combining fundamental insight with applied goals, this research pioneers a sustainable pathway for nitrogen fixation beyond the Haber-Bosch process.

Original text from CORDIS.

Participants

• CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisCoordinatorFrance

Links

• View on CORDIS
• DOI: 10.3030/101272906