Fluorescent and electronic properties of Dysprosium acylpyrazolone complexes along with their synthesis and structural features

Six distorted square antiprismatic eight coordinated Dysprosium acylpyrazolone complexes were synthesized having the compositions [Dy(L-1)(3)(EtOH)(H2O)] (DyL1), [Dy(L-2)(3)(EtOH)(H2O)] (DyL2), [Dy(L-3)(3)(EtOH)(H2O)] (DyL3), [Dy(L-4)(3)(EtOH)(H2O)] (DyL4), [Dy(L-5)(3)(EtOH)(H2O)] (DyL5), and [Dy(L-6)(3)(H2O)(EtOH)] (DyL6). The structure of all six complexes was examined using ESI-mass, FT-IR, UV-Vis, powder XRD, and thermogravimetric methods. According to the single crystal analysis of DyL4A, the complex was found eight coordinated (DyO8) with a distorted square antiprismatic geometry. The comparison of stimulated powder pattern of DyL4A crystal and experimental powder x-ray data helps to confirm the geometry of other complexes. In the solid-state emission spectra, the transition F-4(9/2)-> H-6(13/2), which is close to the yellow region of the visible spectrum (similar to 510-530 nm), exhibits hypersensitivity. The variance in intensity between electric-dipole and magnetic-dipole transition suggests a less asymmetric environment. The solvent effect has been thoroughly investigated through a comparative analysis of electronic spectra in different solvents. The intensity of emission spectra, Y/B ratio, and antenna effect energy diagram were examined from solid-state emission spectra.