Structure and dynamic behaviour of lanthanide nitrate complexes with bis(diphenylphosphorylmethyl)mesitylene in solutions: The nature of unexpected 31P NMR spectra

Lanthanide phosphine oxide complexes

“…Complexes with lanthanide nitrates and the phosphine oxide substituted ferrocene, (25), can form a variety of complexes [91] [94]. The 31 P NMR spectra and conductivity measurements indicated that in acetonitrile ionisation occurs to a minor extent giving [Nd(NO 3 ) 2 (28)] + (presumably solvated by acetonitrile).…”

Synthesis and Coordination Properties of Tripodal Ligand on the Triphenylphosphine Oxide Platform with Carbamoyl Side Arms

“…Typical decrease in ν P O on coordination of phosphoryl-containing ligands in complexes with uranyl and lanthanide nitrates is 30-50 cm −1 . [31][32][33][34] The bands of ν C O change: a weak band remains in the region of vibrations of free C O groups (1664 cm −1 ) and a strong band appears at 1601 cm −1 that corresponds to vibrations of coordinated groups. One can suppose, taking into account intensity ratio, that two C O groups are coordinated in complex 3, while one group remains free.…”

“…The broadening and shift value are typical for the neodimium complexes of phosphoryl ligands. 32,46 The broadening in the 1 H NMR spectrum of complex 4 is rather considerable. There is no fine structure, the signals of many protons are not detected probably on account of considerable broadening that substantially decreases the scope of obtained data.…”

Effect of the nature of substituents at the phosphorus atom on extraction properties of phosphorylketones toward f-elements

“…Similar patterns are also described for the complexes of lanthanide nitrates with related phosphine oxides. [27][28][29] As it was shown earlier, 9 the nature of the linear alkyl substituents at the phosphorus atom has almost no ef fect** on the efficiency and selectivity of extraction of lanthanides with phosphorylketones Alk 2 P(O)CMe 2 CH 2 C(O)Me. At the same time, using diphenylphosphorylat ed ketones Ph 2 P(O)CRR´CH 2 C(O)Me (R = H, Me; R´ = H, Me, Ph, C 5 H 11 , 2 furyl, 2 thienyl) as examples it was found*** that in contrast to lanthanides with large radii, the extraction ability of these ligands toward Yb III is especially sensitive to the steric hindrance arising upon introduction of a substituent in the ethylene linker.…”