Highly Efficient Detection of Pd²⁺ in Aqueous Medium by an Elusive Mn(II) Coordination Polymer

Herein, we report the synthesis of a Mn(II)-based coordination polymer (CP); and its structure, phase consistency and thermal stability have been established by single-crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD) and thermalgravimetric analysis (TGA) respectively. This is the first example of paramgnetic Mn(II)-based CP that acts as pH-dependent emitting material [λ_em=525 nm (pH=2.0-4.0) and 450 nm (pH=5.0-12.0)]. Its emission is quenched by Pd²⁺ in aqueous medium in presence of other thirteen cations with reasonably low pH-dependent limits of detection (LODs) [21.178 ppb (pH=3), 15.005 ppb (pH=7.0) and 59.940 ppb (pH=10.0)] as described by well-established mechanism. Therefore, urgency of such stable sensor remains high in regard to the environmental pollution.