SYNTHESIS, IR AND PL SPECTRA OF NOVEL COMPLEXES [ZnL1(CH3COO)2]‧2H2O AND [CdL1(CH3COO)2]‧3H2O

Lidia CUBA,Ion BULHAC,Moldova State University,Vladislav GHENEA,Moldova State University,Technical University of Moldova,Ion CULEAC,Moldova State University

Abstract

Transition metal d10 complexes [ZnL1(CH3COO)2]∙2H2O and [CdL1(CH3COO)2]∙3H2O have been synthesized and characterized by infrared (IR) and photoluminescence (PL) spectroscopy. Under near-UV irradiation the powder samples of two complexes exhibit a strong emission in the spectral range ~ 460-700 nm, with no specific splitting, while the ligand itself shows no luminescence. The coordination of the ligand with Zn(II) or Cd(II) ions within the complexes leads to appearance of strong ligand-centered fluorescence emission in the visible domain. The bright- green luminescence in both complexes is due to the considerable reduction of radiationless rate constants in compari- son with the free ligand. The relative intensities of Zn(II) compound is higher than that of Cd(II) compound, similarly as reported in the literature. The relationships between the IR and PL characteristics of Zn(II) and Cd(II) compounds are discussed. Investigated Zn(II) and Cd(II) complexes appear as promising materials for green-emitting compo- nents in digital display screens or white-light emitters. Keywords: d10 metal ions, Zn(II) complex, Cd(II) complex, ligand, photoluminescence, optical transitions, white- light emitters. DOI: https://doi.org/10.59295/sum1(191)2026_42