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- W2018161805 abstract "Abstract The new complexes of formula R(L) 3 ·3H 2 O, where L is the bidentate donor ligand C 13 H 20 NO 4 derived of DL-valine and R is a rare earth element from Eu to Ho, have been prepared according to the following scheme: RC1 3 + 3KL + 3H 2 O → R(L) 3 · 3H 2 O + 3KC1 All these complexes were characterized by elemental analysis, IR, TG and DTA techniques. The ligand was also characterized by 1 hnmr. The R element is coordinated to the DL-valine through the carboxylate and amino groups and the nine-coordination is completed by three coordination water molecules. Stability increases with increasing atomic number of the lanthanide element and in this way, the determined dehydration enthalpy of the Ho[C 13 H 20 NO 4 ] 3 ·3H 2 O is 15.66 Kcal mol −1 , which represents the higher melting point of all these complexes. The magnetic susceptibility measurements obey in all cases a Curie-Weiss behavior in a very wide temperature range, small deviations found at low temperatures are due to the crystal field effects." @default.
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- W2018161805 date "1997-03-01" @default.
- W2018161805 modified "2023-10-18" @default.
- W2018161805 title "Synthesis and characterization of lanthanide complexes derived of DL-valine: R[C13H20NO4]3·3H2O" @default.
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- W2018161805 doi "https://doi.org/10.1016/s0925-8388(96)02744-2" @default.
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