AI Article Synopsis
- A new pincer ligand based on 2,3-benzo[b]thiophene is developed to connect dialkyl phosphine donors to iridium (Ir) complexes.
- When reacting a chloro derivative of this ligand with N2O, it forms an iridaepoxide by adding an oxygen atom to the Ir═C bond, which further reacts with H2 to create a dihydride product.
- The conversion of this dihydride to its isomer is key for releasing H2O, facilitating the overall transformation of N2O and H2 into N2 and H2O, with additional studies exploring how to optimize the process for catalytic efficiency.
Article Abstract
A new PC(carbene)P pincer ligand with 2,3-benzo[b]thiophene linkers connecting the flanking dialkyl phosphine donors to the central carbene can be attached to Ir(I). The chloro derivative reacts with N2O with loss of N2 to form an iridaepoxide species by addition of an oxygen atom to the Ir═C linkage. This compound reacts with H2 to afford the oxidative addition product, in which the hydride ligands are trans to the Ir-O bond. Heating this dihydride results in slow release of H2O; kinetic and spectroscopic studies show that conversion of the dihydride to its isomer, in which the hydrides are cis to the Ir-O bond, is required for H2O elimination to take place. Together, these reactions constitute the stoichiometric conversion of N2O and H2 to N2 and H2O; further mechanistic studies suggest ways to make the system catalytic.
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