Self‐Assembly Assisted Tandem Sensing of Pd ²⁺ and CN ⁻ by a Perylenediimide‐Peptide Conjugate

Abstract

Abstract A tandem sensor for Pd 2+ and CN − ions based on perylenediimide‐peptide conjugate is reported. The probe showed high selectivity toward Pd 2+ ion over other metal cations and the sensitivity was observed to be 0.55 ppb, significantly lower than other similar chemosensors. Binding with Pd 2+ leads to aggregation of the ligand and consequently results in quenching of its emission. The quenched emission can be turned on in presence of CN − ions as the cyanides form stronger complex with Pd 2+ leading to disaggregation of the aggregated system. The system was found to be extremely selective to CN − and the detection limit in this case was calculated to be as low as 0.226 ppb. The sensor is also utilized to construct a practical and simple TLC based tool to sense these two ions efficiently.