Absorption spectra and structure of lanthanide coordination compounds in solution

The ligand mediated pseudohypersensitivity of the 3H4 → 3P2, 3H4 → 3P1, 3H4 → 3P0, and 3H4 → 1D2 transitions of praseodymium(III) complexes in solution media

“…An examination of Carnall's coefficients for U (2) shows that these are nearly the same for the 3~o and 3~1 bands; consequently these bands should show the same strengths. One observes, however, that the intensity of the 3~1 band is higher than that of 'Po.…”

“…All show a significant variation of intensities for the pseudohypersensitive transitions. The diols are all related, differing only in the bond order (1)(2)(3) between the 2nd and 3rd carbon atoms of the diol function. Table 1 shows that the oscillator strength of the transition increases in the order: butane-1,4 < butene-1,4 < butyne-1,4.…”

“…bands as marker bands has increased the importance of so-T h e intensity of hypersensitive transitions (1)(2)(3) has been used extensively to distinguish between outer and inner sphere coordination, in identifying the coordinating sites of ligands (4), in determining the immediate coordination environment, and in predicting the coordination number of lanthanides (5)(6)(7)(8)(9)(10). Hypersensitivity has attracted much attention even though theories proposed to explain the phenomenon are far from quantitative.…”

1D, 2D and 3D Coordination Polymers of Aromatic Carboxylate TbIII: Structure, Thermolysis Kinetics and Fluorescence

“…[35] The splitting of the weak peak at 582 nm is due to crystal-field splitting. [36] As showed in Figure 13, the relative luminescence intensity of complex 2 is much stronger than that of complexes 1 and 3, and complex 2 also displays a longer phosphorescence lifetime (2.76 ms) than 1 (2.52 ms) or 3 (2.37 ms). That is, the luminescence performance of 2 is the best among the three complexes.…”

Síntese e caracterização dos compostos de adição entre os mono e dicloroacetatos de lantanídeos (III) e a quinolina-N-óxido (QNO)

“…onde G é a posição do baricentro de um nível energético em cm- A força do oscilador é determinada experimentalmente, medindo-se a área sob a curva de absorção e calculando-se P pela Equação 4.18 [153]: [157].…”