1：Experimental Design and Method Selection:

A Zn(II)-based MOF was synthesized by a solvothermal method with H3TAPB and Zn(NO3)2?6H2O. The modified product (Eu@1) was obtained by encapsulating Eu3+ in channels of

2：2O. The modified product (Eu@1) was obtained by encapsulating Eu3+ in channels of Sample Selection and Data Sources:

1. 2. Sample Selection and Data Sources: The potential applications of Eu@1 for detecting metal ions with fluorescence were investigated.

3：List of Experimental Equipment and Materials:

Powder X-ray diffraction (PXRD) patterns were measured on a PANalytical Empyrean diffractometer. Thermogravimetric analysis (TGA) was carried out with a flow of nitrogen at a heating rate of 5 ?C/min using a Netzsch TG 209 F

4：Single-crystal X-ray diffraction data were acquired using a Rigaku Oxford Diffraction SuperNova diffractometer. ICP analysis was performed on a Thermo Fisher ICAP Qc. Fluorescence spectra was collected using an Edinburgh FLSQuantum yields were recorded by the Hamamatsu C9920 Absolute photoluminescence (PL) Quantum Yield Measurement System. Experimental Procedures and Operational Workflow:

Eu@1 was immersed in DMA solutions of M(NO3)n at ambient temperature. The concentration of metal ions was 10 mM. For sensitization competition experiments, Eu3+@1 was added into the Cu2+ solution with an equal molar amount of other ions.

5：Data Analysis Methods:

The luminescence intensity of the highest characteristic emission peak of Eu3+ at 612 nm was monitored.