A Luminescent Hypercrosslinked Conjugated Microporous Polymer for Efficient Removal and Detection of Mercury Ions

A hypercrosslinked conjugated microporous polymer (HCMP‐1) with a robustly efficient absorption and highly specific sensitivity to mercury ions (Hg 2+ ) is synthesized in a one‐step Friedel–Crafts alkylation of cost‐effective 2,4,6‐trichloro‐1,3,5‐triazine and dibenzofuran in 1,2‐dichloroethane. HCMP‐1 has a moderate Brunauer–Emmett–Teller specific surface (432 m 2 g −1 ), but it displays a high adsorption affinity (604 mg g −1 ) and excellent trace efficiency for Hg 2+ . The π–π* electronic transition among the aromatic heterocyclic rings endows HCMP‐1 a strong fluorescent property and the fluorescence is obviously weakened after Hg 2+ uptake, which makes the hypercrosslinked conjugated microporous polymer a promising fluorescent probe for Hg 2+ detection, owning a super‐high sensitivity (detection limit 5 × 10 −8 mol L −1 ).