Chapter 2 Multiple Choice Questions

Electronic structure, magentism and spectroscopy

Quiz Content

not completed
. The factors that determine the electronic energy levels in a lanthanoid complex are (in decreasing order of magnitude):

not completed
. The ground-state term symbol for Tm3+ is:

not completed
. Complexes of Eu3+ are paramagnetic at room temperature because:

not completed
. In an aqueous solution of Pr3+, the 3H4 to 3P2 transition occurs at 444 nm and the 3H4 to 3P1 transition occurs at 469 nm. At what wavelength does the 3H4 to 3P0 transition occur?

not completed
. Aqueous solutions of Ce3+ appear colourless because:

not completed
. [Eu{bipy(2.2.2)}]3+ exhibits intense luminescence in aqueous solution when irradiated with UV radiation (bipy(2.2.2) is a neutral cryptand ligand that contains three 2,2-bipyridyl units).
Which of the following does not contribute to the intense luminescence?

not completed
. Which of the following would not exhibit pseudocontact shifting in its NMR spectra at room temperature?

not completed
. Which of the following statements about the electronic absorption spectra of Pr3+ complexes is incorrect?

not completed
. Which of the following properties is not required (or at least desirable) in a lanthanoid single ion magnet?

not completed
. When an aqueous solution of Tb3+ is irradiated with a UV lamp, there is no visible luminescence. Consider the following possible explanations:
(i) Direct excitation of Tb3+ is inefficient
(ii) [Tb(H2O)n]3+ is extremely labile
(iii) The emission from Tb3+ is in the IR
(iv) Tb3+ undergoes photochemical oxidation to Tb4+
(v) Luminescence is quenched by vibrational de-excitation
Now select the correct statement below.

Back to top