Wydział Chemii

Grażyna Oczko

Lucyna Macalik

2010

Polyhedron

29

1231-1236

10.1016/j.poly.2009.12.033

Naukowa

Angielski

Artykuł

Studies of heavy lanthanide chlorides may provide important information on the degree of Ln³⁺–ligand bond covalency. Monocrystals of LnCl₃·6H₂O, where Ln = Dy, Ho and Er, were grown and spectroscopic investigations were performed at room temperature and at low temperatures down to 4.2 K in order to understand the nature of the Ln³⁺–L bonds. The intensities of the electronic lines and the Judd–Ofelt parameters were calculated and compared with those obtained for chlorides of light lanthanides (i.e. Ce(III), Pr(III) and Nd(III)). Room temperature Raman and IR studies of the compounds under investigation were also performed. The relationship between hypersensitivity and covalency is discussed. The change of vibronic coupling strength along the lanthanide ion series does not modify monotonically. The ion-pair interactions are especially visible for the ⁵I₈ → ⁵F₂ and ⁵I₈ → ⁵F₃ transitions in the HoCl₃·6H₂O low temperature spectra.

lanthanides, chlorides, UV–vis spectroscopy, IR spectroscopy, Raman spectroscopy

https://doi.org/10.1016/j.poly.2009.12.033

http://www.elsevier.com