Syntheses and Structures of Two Mixed Ligands Lanthanide Complexes with N,N—Substituted Adipamide

1 INTRODUCTIONInstead of the traditional organo-phosphate or phosphorus extractents which ultimately create undesirable waste even after incineration 1], some organic amides2] have been suggested as possible extractents for the separation of lanthanides, such as (R1R2NCO)2(CH2)n 3,4]. As excellent ligands, diamides show stability, low toxicity and can be synthesized by simple methods. Hudson and his colleagues have synthesized a series of malondiamides and studied the structures of t…

Syntheses and Structures of Two Mixed Ligands Lanthanide Complexes with N,N'-Substituted Adipamide

Crystal structures of neodymium (Ⅲ) and dysprosium (Ⅲ) nitrate complexes with the new ligand N, N'-dimethyl-N, N'-diphenyladipamide (mpaa) has been determined. Both complexes are triclinic with space group Pi ,formula C22H30N5NdO12S]2 1 C42H54N7DyO14S 2]Mr = 1465.621075.48], a = 8.541(1)9.711(2)], b = 11.915(1)16.017(3)], c = 15.906(1)16.686(3)] A,α =107.22(1)109.600(1)],β = 98.12(1)92.50(1)], γ = 99.78(1) 96.22(1)]° ,μ=0.71073cn-1; R=0.0261 0.0364], wR=0.0611 0.0857] reflections with I＞2 σ (Ⅰ). Complex (1)is dinuclear, in which two Nd(Ⅲ) ions are double-bridged by two mpaa ligands. And Dy(mpaa)2(dmso)(NO3)3 (2) (dmso= dimethylsulfoxide) is a mononuclear complex, in which one of the two C=O groups in MPAA is uncoordinated. In the two above complexes, each Ln(Ⅲ)ion is nine-coordinated including three bidenate nitrates, one dmso molecule and two carbonyl oxygens from two different mpaa ligands. Neutral monodentate dmso enters the coordination in diamides of the type (R1R2NCO)2(CH2)n was increased, the ligand prefers to act as a bridging reagent rather than a chelate.