Reversible Structural Transformation of Cu^I–Tb^III Heterometallic MOFs with Highly Efficient Detection Capability toward Penicillin

Abstract

A Cu^I-Tb^III heterometallic MOF, namely <b>1</b>·DMF, was obtained via a coordination assembly process of isonicotinic acid with Cu^I and Tb^III. <b>1</b>·DMF can be switched to <b>1</b>·MeOH in methanol with a luminescent emission response. Meanwhile, <b>1</b>·MeOH exhibits a reversible single-crystal transformation to <b>1</b>·DMF after immersion in DMF. Both MOFs have superior physicochemical stability. The <b>1</b>·DMF-based biosensor has a remarkable sensing performance toward penicillin.