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

A phenanthroline-functionalized Cd^II 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 (ΔH_ads ≈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.