Nitric Oxide Adsorption in Cu(3)btc(2)-Type MOFs-Physisorption and Chemisorption as NONOates

摘要

The adsorption of the biologically important signaling molecule nitric oxide (NO) on two metal-organic frameworks (MOFs), Cu(3)btc(2) and Cu-3(NHEtbtc)(2), has been studied by multinuclear solid-state NMR. N-Diazenium diolate (NONOate) formation as primary mode of NO adsorption in the latter MOF is concluded from N-15, H-1, and C-13 NMR spectra together with analysis of the H-1 spin-lattice relaxation time (T-1). Furthermore, NO adsorption at the open metal site of Cu(3)btc(2) as well as Cu-3(NHEtbtc)(2) is also evident, indicating both physisorption and chemisorption of nitric oxide.