Browsing by Author "Danilescu, Olga"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    AGENȚI DE COORDINARE DE TIP BAZE SCHIFF – SURSE GENERATIVE DE EMISIE
    (CEP USM, 2024) Danilescu, Olga; Culicova, Olga; Cocu, Maria; Bulhac, Ion
    This work elucidates the structure-property correlation and comparative study of the photoluminescent activity of three lumonophore Schiff base coordination agents H2L1, H2L2 and H2L3 (H2L1 = 2,6-diacetylpyridine bis(isonicotinoylhydrazone), H2L2 = 2,6-diacetylpyridine bis(nicotinoylhydrazone) and H2L3 = 2,6-diacetylpyridine bis(picolinoylhydrazone)) and their precursors. The fluorescent emissions of both the starting substances and the coordination agents show emission bands in the blue region (500-550 nm). The comparative study of the photoluminescent activity shows a 100-fold increase in the luminescence intensity of the coordination agents H2L1 and H2L2 compared to that of their precursors, and the coordination agent H2L3 showed a 50-fold increase in luminescence intensity compared to that of the starting substances.
  • Thumbnail Image
    Item
    SINTEZA POLIMERULUI COORDINATIV HETEROMETALIC Mn(II)/Cd(II), STUDIUL STRUCTURAL ȘI AL FOTOLUMINESCENȚEI
    (CEP USM, 2024) Danilescu, Olga; Croitor, Lilia; Bouroș, Polina; Kulikova, Olga; Cocu, Maria; Bulhac, Ion; Chumakov, Iurie
    Based on solvothermal synthesis, self-assembly of the heptadentate 2,6-diacetylpyridine bis(nicotinoylhydrazone) schiff base ligand (H2l) and Mn(II) and Cd(II) salts has led to formation a heterometallic {[Mn0.3Cd0.7l]·dmf·0.25H2O}n (1) coordination polymer. This compound was characterized by IR spectroscopy, single-crystal X-ray diffraction, as well as the photoluminescente proprietes were studied.