Effective Degradation of Novichok Nerve Agents by the Zirconium Metal–Organic Framework MOF-808

Autor: Martijn C. de Koning, Carla Vieira Soares, Marco van Grol, Rowdy P. T. Bross, Guillaume Maurin
Rok vydání: 2022
Předmět:
Zdroj: ACS Applied Materials & Interfaces. 14:9222-9230
ISSN: 1944-8252
1944-8244
DOI: 10.1021/acsami.1c24295
Popis: Novichoks are a novel class of nerve agents (also referred to as the A-series) that were employed in several poisonings over the last few years. This calls for the development of novel countermeasures that can be applied in protective concepts (e.g., protective clothing) or in decontamination methods. The Zr metal-organic framework MOF-808 has recently emerged as a promising catalyst in the hydrolysis of the V- and G-series of nerve agents as well as their simulants. In this paper, we report a detailed study of the degradation of three Novichok agents by MOF-808 in buffers with varying pH. MOF-808 is revealed to be a highly efficient and regenerable catalyst for Novichok agent hydrolysis under basic conditions. In contrast to the V- and G-series of agents, degradation of Novichoks is demonstrated to proceed in two consecutive hydrolysis steps. Initial extremely rapid P-F bond breaking is followed by MOF-catalyzed removal of the amidine group from the intermediate product. The intermediate thus acted as a competitive substrate that was rate-determining for the whole two-step degradation route. Under acidic conditions, the amidine group in Novichok
Databáze: OpenAIRE