Functionalized NU-1000 with an Iridium Organometallic Fragment: SO₂ Capture Enhancement

Abstract

A new material, MOF-type [Ir]@NU-1000, was accessed from the incorporation of the iridium organometallic fragment [Ir{κ³(P,Si,Si)PhP(<i>o</i>-C₆H₄CH₂Si^<i>i</i>Pr₂)₂}] into NU-1000. The new material incorporates less than 1 wt % of Ir(III) (molar ratio Ir to NU-1000, 1:11), but the heat of adsorption for SO₂ is significantly enhanced with respect to that of NU-1000. Being a highly promising adsorbent for SO₂ capture, [Ir]@NU-1000 combines exceptional SO₂ uptake at room temperature and outstanding cyclability. Additionally, it is stable and can be regenerated after SO₂ desorption at low temperature.