4f-Luminescence of ytterbium ions in the complexes with asymmetric porphyrins

New complexes of ytterbium with asymmetric porphyrins containing substituents in β-positions were obtained and characterized by elemental analysis, IR, UV-vis absorption and luminescence spectroscopy. Electronic absorption, luminescence and luminescence excitation spectra of these complexes were studied at 295 K in DMF solutions. The 4f-luminescence of ytterbium-porphyrins in the near infrared (IR) spectral region (λmax = 980 nm) is observed under excitation in Soret band (400-430 nm). The effect of substituent in porphyrin macroring on the 4f-luminescent properties was also investigated.