The compound {[Cd(H₂IDC)₂(H₂O)₂]·2H₂O}_n (1) was synthesized via a hydrothermal method, utilizing 4, 5-imidazoledicarboxylic acid (H₃IDC) and Cd(NO₃)₂·4H₂O as raw materials. Single crystal X-ray diffraction (SXRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and fluorescence spectroscopy (FL) were employed to ascertain and elucidate the structure of compound 1. SXRD analysis reveals that compound 1 categorized under the P2₁/n space group of monoclinic crystal system. In compound 1, Cd(II) ions coordinate with H₂IDC^- anions and water molecules to form a six-coordinated octahedral configuration, which is further extended into a three-dimensional structure through hydrogen bonding. Fluorescence spectrum analysis at room temperature indicates that compound 1 exhibits the most intense emission peak at 598 nm when excited at a wavelength of 296 nm.