Two-dimensional Cd(ii) coordination polymer encapsulated by Tb3+ as a reversible luminescent probe for Fe3.

Yuandi Wu,Meihua Lin,Jing Qian,Ming Liu,Dongyang Liu

doi:10.1039/c9ra06639j

Abstract

A two-dimensional luminescent cadmium(ii) coordination polymer, [Cd(modbc)2]n (Cd-P); modbc = 2-methyl-6-oxygen-1,6-dihydro-3,4′-bipyridine-5-carbonitrile, was successfully synthesized by a solvothermal reaction and fully characterized. Cd-P exhibited excellent luminescence emission, and detected Cu2+, Co2+, Fe2+, Hg2+, Ni2+ and Fe3+ ions with high sensitivity and showed good anti-interference performance. After encapsulation of Tb3+ ions in Cd-P, the as-obtained fluorescent functionalized Tb3+@Cd-P maintained distinct chemical stabilities in different pHs and metal salt solutions. Subsequently, we explored the potential application of Tb3+@Cd-P as a probe for Fe3+ ions. A new and convenient method for individual identification of Fe3+ ions by the combination of Cd-P and Tb3+@Cd-P was successfully established. A possible sensing mechanism is discussed in detail.

Highlights

Chemists have been highly successful at developing detection methods for anions, cations, small organic molecules and biological macromolecules
Synthesis of [Cd(modbc)2]n (Cd-P) Cd-P was obtained by one-pot solvothermal synthesis from CdSO4 (0.05 mmol, 0.008 g), modbc (0.1 mmol, 0.021 g) in 10 mL of water/DMF (4 : 1)
The high stabilities of Cd-P (Fig. S3 and S4†) and Tb3+@Cd-P (Fig. S5†) in aqueous solution of metal salts, organic solvents, different temperatures, and the solutions with pH range from 0.5 to 14.0 (Fig. S9†) suggest that the luminescence quenching is not caused by framework collapse

Summary

Introduction

Chemists have been highly successful at developing detection methods for anions, cations, small organic molecules and biological macromolecules. Rapid selection and sensitive detection of Fe3+ ions has aroused widespread interest because Fe3+ ions have important cell functions such as hemoglobin formation and play a vital role in biological systems.[12,13,14] Its de ciency or excess over the normal allowable limit can lead to physical diseases such as diabetes, anemia, arthritis, mental decline, cancer and so on.[15,16] In addition, with the rapid development of industry, a large number of harmful inorganic ions is being released into the environment, and causing adverse effects on people's health.[17,18,19] In a word, is Fe3+ recognized as an detection using uorescence is still challenging.[34]

Results

Discussion

Conclusion