Abstract: A cadmium coordination polymer， ｛［Cd（SCND）（2，2'-bpy）（H₂O）］·1.25H₂O｝ _n （CP1）， was synthesized via solvothermal method using 4-sulfo-N-（4-carboxyphenyl）naphthalene-1，8-dicarboximide （H₂SCND） and 2，2'-bipyridine （2，2'-bpy） as ligands. Elemental analysis （EA）， single-crystal X-ray diffraction （SXRD）， infrared spectroscopy （IR）， thermogravimetric analysis （TGA） and powder X-ray diffraction （PXRD） were employed to characterize CP1. Single-crystal X-ray diffraction analysis reveals that CP1 crystallizes in the monoclinic space group P2₁/n with the following unit cell parameters： a=1.066 58（10） nm， b=1.098 37（10） nm， c=2.361 91（3） nm， and β=100.527（10）°. The central cadmium ion is hexacoordinated， forming a distorted octahedral configuration. Among six atoms involved in the coordination， there comprises three oxygen donors （O2， O1#2， O7#1） derived from three separate SCND ligands， two nitrogen atoms （N2， N3） from the 2，2'-bpy ligand， and one oxygen atom （O1W） from a coordinated water molecule. Through the bridging effect of SCND ligands， the Cd（II） ions are connected into 1D cyclic chains. These adjacent chains are further intertwined into a 3D supramolecular architecture through the cooperative action of C—H…O， O—H…O hydrogen bonding and π…π stacking interactions. Hirshfeld surface analysis was performed to evaluate the distribution of interatomic contact contributions on the molecular surface， among which the H…H interaction contributed 30.5% to the molecular surface， ranking first. Additionally， solid-state fluorescent behavior of CP1 was explored. When excited at 378 nm， CP1 shows an intense emission peak centered at 440 nm， highlighting its potential application as a blue-light material.

Key words: cadmium coordination polymer; solvothermal synthesis; crystal structure; Hirshfeld surface analysis; solid-state fluorescent property