Tuning the nitric oxide release behavior of amino functionalized HKUST-1

Four new secondary amino functionalized trimesic acid ligands (H3RNHbtc, R = Me, Et, nPr, and iPr) were synthesized. When used in combination with H3btc these ligands lead to four new mixed-linker metal-organic frameworks (MOFs) which we call UHM-36, UHM-37, UHM-38, and UHM-39. All MOFs are isostructural to HKUST-1. We tested these MOFs as nitric oxide storage and release materials and investigate the influence of the amine groups on the NO storage capacity of the MOFs. The results were compared to the unfunctionalized HKUST-1, i.e. Cu3(btc)2.