Design, Structural Characterization, and Fluorescence Behavior of a New Centrosymmetric Dinuclear Cd(II) Complex With 2‐Formylphenoxyacetic Acid and 1,10‐Phenanthroline

A new centrosymmetric dinuclear Cd(II) complex, [Cd 2 (L) 4 (Phen) 2 ] ( 1 ) (HL = 2‐formylphenoxyacetic acid; Phen = 1,10‐phenanthroline), was synthesized using Cd(NO 3 ) 2 ·4H 2 O, 2‐formylphenoxyacetic acid, 1,10‐phenanthroline, and NaOH in a CH 3 CH 2 OH/H 2 O mixture (v:v = 3:1). The structure of 1 was confirmed through elemental analysis, IR spectroscopy, UV–vis spectroscopy, and single‐crystal X‐ray diffraction analysis. In 1, the crystallographic independent Cd(II) ion in the complex adopts a seven‐coordinate geometry, forming a distorted pentagonal bipyramidal coordination environment of N 2 O 5 . The complex assembles into a 1D chain structure through π–π stacking interactions between the phenanthroline rings, which further interpenetrate to create a two‐dimensional layered structure. In addition, the fluorescence properties of the Cd(II) complex in various solvents, including water, DMF, and ethanol, were investigated. The fluorescence properties of the Cd(II) complex in water, DMF, and ethanol were that the maximum emission wavelengths are 431 nm in water, 432 nm in DMF, and 436 nm in ethanol upon excitation at 375 nm, with fluorescence intensity decreasing as solvent polarity increases.