Two luminescent coordination polymers as highly selective and sensitive chemosensors for CrVI-anions in aqueous medium

Abstract

Two luminescent coordination polymers (CPs), {[Cd₂L₂(H₂O)₄]·H₂O}_n (1) and {[Zn₂L₂(H₂O)₄]·H₂O}_n (2) (H₂L = 5-(1H-1,2,4-triazol-1-yl)isophthalic acid) are reported herein. The CPs reveal readily dispersible two-dimensional (2D) layer structures with considerable stability in aqueous media within a wide pH range (pH = 2–12). Sensing experiments indicate that they can serve as highly selective and sensitive fluorescent probes toward Cr^VI-anions (CrO₄²⁻ and Cr₂O₇²⁻).