79321-04-3Relevant academic research and scientific papers
Spectroscopic study of neodymium soaps in 1-pentanol
Binnemans,Martello,Couwenberg,De Leebeeck,G?rller-Walrand
, p. 387 - 392 (2000)
The optical absorption spectra of neodymium(III) butanoate, pentanoate, hexanoate, heptanoate and octanoate in 1-pentanol have been measured. This solvent has been chosen, because the neodymium(III) soaps are sufficiently soluble in it. A set of free-ion parameters is obtained by fitting the calculated energy levels against the experimental levels. The experimental dipole strengths of the transitions are determined from the absorption spectra and parameterised in terms of the Judd-Ofelt intensity parameters f!A ( A = 2, 4, 6). The f!4 values go through a maximum for neodymium(III) hexanoate, whereas the Ω2 parameter increases in the order butanoate≤pentanoate≤hexanoate≤heptanoate≤octanoate. The Ω6 parameter shows only an increase between the butanoate and the pentanoate complex, whereas this parameter remains fairly constant for the higher homologues of the neodymium(III) soaps.
Spectroscopic and Conductometric Studies of Lanthanide Soaps
Mehrotra, Krishna N.,Shukla, Rajeev K.,Chauhan, Mithlesh
, p. 1825 - 1832 (1995)
Infrared spectral studies of lanthanide soaps (octanoates of cerium, didymium, neodymiun, and samarium) reveal that fatty acids exist with a dimeric-type structure through hydrogen bonding between two molecules of fatty acids, whereas the metal-to-oxygen bonds in these soaps have an ionic characater.The X-ray diffraction results confirm that these soaps have a double-layer structure with molecular axes slightly inclined to the basal plane.The premicellar association and the formation of micelles in lanthanide soap solutions have been investigated by conductometric measurements in a nonaqueous medium.The molar conductance at infinite dilution, the degree of ionization and the ionization constant have been evaluated.The results show that these soaps behave as weak electrolytes in dilute solutions.
