A Bifunctional Metal-Organic Framework: Striking CO2 -Selective Sorption Features along with Guest-Induced Tuning of Luminescence.

A phenanthroline-functionalized CdII aminoterephthalate [Cd(NH2 -bdc)(phen)]n (NH2 -bdc=2-aminobenzenedicarboxylic acid, phen=1,10-phenanthroline) metal-organic framework (MOF) displays CO2 -selective adsorption properties and photoluminescence induced by phenolic guests. The inherently guest-free, rigid amine-rich framework exhibits substantial CO2 -selective adsorption at ambient temperatures (both at 273 and 298 K) over other flue gases like N2 , CH4 , O2 , Ar and H2 , with a high isosteric heat of adsorption at zero coverage (ΔHads ≈34 KJmol-1 ). Moreover, the fluorescent phenanthroline guest introduced to the MOF results in an excellent photoluminescence signature, which can serve as a marker for tuning phenolic-guest-induced luminescence. This marks the first report of observing distinct fluorescence responses to differentially functionalized phenolic analytes, in the domain of coordination polymer materials.