Construction of a 1-D Sm(iii) coordination polymer with a long-chain Schiff base ligand: dual-emissive response to metal ions

Abstract

A 1-D coordination polymer [Sm(HL)₂(NO₃)]_n (1) was constructed using a new flexible Schiff base ligand that has a long-chain (CH₂)₁₀ backbone. The Schiff base ligand exhibits a linear coordination configuration, resulting in the “zig-zag” structure of 1. Besides the ligand-centered emission, 1 displays typical visible and NIR luminescence of Sm³⁺. Interestingly, 1 shows dual-emissive response to metal ions, especially to Co²⁺ at the ppm level.