1：Experimental Design and Method Selection:

Hydrothermal synthesis was used to prepare the coordination polymers. Characterization methods included elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, luminescence spectroscopy, UV-vis diffuse reflectance spectroscopy, and photocatalytic degradation experiments.

2：Sample Selection and Data Sources:

Ligands L1 and L2 were synthesized following a literature procedure. Other reagents were commercially available and used without further purification.

3：List of Experimental Equipment and Materials:

Equipment included Perkin-Elmer 240C analyzer, Rigaku D/Max-2500PC diffractometer, Avatar 360 (Nicolet) spectrophotometer, Netzsch STA449 F1 thermal analyzer, FS5 luminescence spectrophotometer, UV-Vis Puxi T9 UV-visible spectrophotometer, Bruker Smart 1000 CCD diffractometer, and a 300 W mercury lamp. Materials included Zn(NO3)2·6H2O, ZnSO4·7H2O, H2PA, H2PDA, NaOH, H2O, KBr, BaSO4, methylene blue, tertiary butyl alcohol, benzoquinone, ammonium oxalate.

4：Experimental Procedures and Operational Workflow:

For synthesis, mixtures of metal salts, ligands, dicarboxylic acids, and water with adjusted pH were heated in Teflon-lined containers, then cooled to obtain crystals. For photocatalytic experiments, CP samples were added to MB solution, stirred in the dark for adsorption-desorption equilibrium, then exposed to UV light with sampling at intervals for absorbance measurement.

5：Data Analysis Methods:

Elemental analysis for C, H, N; PXRD for phase purity; IR for functional groups; TGA for thermal stability; luminescence spectra for emission properties; UV-vis for absorption and band gap calculation using Kubelka-Munk function; photocatalytic efficiency calculated from absorbance changes; pseudo-first-order kinetics for rate constants; scavenger experiments to identify reactive species.