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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 13, Number 1
BKCSDE 13(1)
January 20, 1992 

Absorption and Fluorescence of Sm(Ⅲ) Complexes with some Terdentate Ligands
Jong Goo Kim, Soo Kyung Yoon, Sock Sung Yun, Jun-Gill Kang*
Spectroscopic measurements and theoretical calculations are performed for the four 1 : 3 Sm(Ⅲ) : ligand solutions. The ligands included in this study are oxidiacetate, iminodiacetate, methyliminodiacetate and dipicolinate. The oscillator strengths for the 4f → 4f multiplet-to-multiplet transitions are empirically determined from the absorption spectra. The intensity parameters Ωλ(λ=2, 4, 6) of Sm3+(aquo) and SmL33- complexes are also evaluated by applying the Judd-Ofelt theorem to the observed oscillator strengths. The values of the intensity parameters are compared and discussed in term of structural properties of the complexes. In addition, the fluorescence spectra are reported for the Sm(Ⅲ) complex systems under mild alkaline condition. The excitation from the 6H5/2 ground state to any excited states lying above the emitting energy level (4G5/2) produces four fluorescence bands, following nonradiative transitions from a certain excited state to the 4G5/2 state. The ratios of oscillator strengths of SmL33- complexes to that of Sm3+(aquo) are also evaluated from the fluorescence spectra and compared to the results obtained from the absorption bands.
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