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

• Published in: ChemistrySelect (Weinheim) Vol. 4; no. 28; pp. 8195 - 8200
• Main Authors: Zhu, Yu, Durini, Sara, Lönnecke, Peter, Cong, Minghui, Hey‐Hawkins, Evamarie
• Format: Journal Article
• Language: English
• Published: 31-07-2019
• Subjects: fluorescence; metal-organic framework; sensor; single-crystal to single-crystal transformation
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.201901980

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.
Porous 2D MOF (Cu–IBA‐1⋅2DMF) shows a reversible SC‐SC transformation to Cu–IBA‐2⋅2H2O leading to the formation of a different coordination framework. The application as chemical sensor for specific metal cations and aryl compounds was explored utilising the photoluminescence behaviour of Cu–IBA‐1⋅2DMF.