Fluorene-based Cu(<scp>ii</scp>)-MOF: a visual colorimetric anion sensor and separator based on an anion-exchange approach

A new 2D Cu(II)-MOF generated from a fluorene-based ligand and Cu(NO(3))(2) was reported. It is an interesting visual colorimetric anion sensor. In addition, it can completely separate Cl(-)/Br(-), Br(-)/I(-) and SCN(-)/N(3)(-) anions under ambient conditions.