Reversible Single-Crystal to Single-Crystal Transformation Between Two Copper(II)-Based Two-Dimensional Coordination Polymers for Detection of Fe3+ and 3-Iodobromobenzene

Abstract

A new two-dimensional copper(II)-based coordination polymer {[Cu(IBA)2]⋅2DMF}n (Cu–IBA-1⋅2DMF) was successfully obtained through solvothermal reaction with 4-(1H-imidazol-1-yl)benzoic acid (HIBA) as linker. On exposure to air, Cu–IBA-1⋅2DMF is slowly converted to a new two-dimensional coordination polymer, namely {[Cu(IBA)2⋅H2O]⋅2H2O}n (Cu–IBA-2⋅2H2O), through a single-crystal to single-crystal (SC-SC) transformation. When suspended in DMF, Cu–IBA-2⋅2H2O regains the initial structure Cu–IBA-1⋅2DMF, indicating the reversibility of this transformation. Fluorescence spectra measurements show that Cu–IBA-1⋅2DMF can selectively and sensitively detect Fe3+ and 3-iodobromobenzene.