Synthesis, Properties and Structure of the Ionic Association Complexes of Rare Earth Nitrates with Cyclam

Abstract

Abstract: The ionic association complexes of La-Tb and Yions with Cyclam were synthesized from the acidic medium of methanol aqueous solution.Through the investigation of elemental analysis, IR,¹H NMR and DTA-TGwe propose that the complexes have a general formula L⁺L²⁺_0.7[Ln(NO₃)₆]_0.8[Ln(NO₃)₃·3H₂O]_0.2·nH₂O(where Ln=La-Tb and Y; n=3 for La and Ce; n=2.5 for Pr-Tb and Y, L=Cyclam).The structure of L⁺L²⁺_0.7[Nd(NO₃)₆]_0.8[Nd(NO₃)₃·3H₂O]_0.2·2.5H₂O was determined by single crystal X-ray diffraction analysis.The lattice parameter are as follows; space group R3, a=1.7000(1) nm, b=1.7000(1) nm, c=1.9862(4) nm, α=90°, β=90°, γ=120°, D_c=1.703 g/cm³,μ(K_a)= 132.9 cm^-1.

Key words: Cyclam(1,4,8,11-tetraazacyclotetradecane), Lanthanide, Rare earth, Complex

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YANG Ru-dong, YAN Lan, WANG Qi-guang, LIU Jian-min, ZHANG Yun . Synthesis, Properties and Structure of the Ionic Association Complexes of Rare Earth Nitrates with Cyclam[J]. Chem. J. Chinese Universities, 1992, 13(6): 720.

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Synthesis, Properties and Structure of the Ionic Association Complexes of Rare Earth Nitrates with Cyclam

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