Two mixed-ligand metal-organic frameworks, [Zn(BDHA)(INA)] (MOF-1: HBDHA = benzene-1,4-dihydroxamic acid; HINA = isonicotinic acid) and [Co(BDHA)(INA)(DMF)] (MOF-2), were solvothermally synthesized and fully characterized by single-crystal X-ray crystallography as well as N, H, and CO gas-sorption measurements. The results constitute the first detailed analysis of the bonding environment around the hydroxamates in such MOFs, which are simultaneously decorated with Lewis-basic sites from the hydroxamate moieties and metal sites predisposed for coordinative unsaturation. MOF-2 shows a desirably selective adsorption of CO relative to N.
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