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Nine Ln( Ⅲ ) complexes with a novel Schiff base derived from diglycolamine and benzoylacetone (BZDA) have been synthesized and characterized. They can be formulated as [Ln2(BZDA)3(NO3)3](NO3)3· nH2O(Ln=La, Pr, Nd, Sm, n = 4; Ln=Gd, Tb, Er, Yb, Y, n = l). Enamic form mechanism in this β-diketone Schiff base and its complexes were suggested and proved by IR, UV and NMR methods. The 13C spin-lattice relaxation time T1 and the ratios of r(ci-Ln)/r(cj-Ln) were measured by a 500 MHz NMR instrument for elucidating the formation of the stable sk-membered chelate ring structure in these complexes. The EPR spectrum of the Gd( Ⅲ ) complex exhibits the “U” spectral feature and “zero field effect”. On the basis of them, the crystal field strength and the local symmetry around Gd3+ in the complex have been discussed.
Nine Ln (Ⅲ) complexes with a novel Schiff base derived from diglycolamine and benzoylacetone (BZDA) have been synthesized and characterized. They can be formulated as [Ln2 (BZDA) 3 (NO3) 3] (NO3) 3 · nH2O (Ln = Ln = Gd, Tb, Er, Yb, Y, n = 1). Enamic form mechanism in this β-diketone Schiff base and its complexes were suggested and proved by IR, UV and NMR methods. The 13C spin-lattice relaxation time T1 and the ratios of r (ci-Ln) / r (cj-Ln) were measured by a 500 MHz NMR instrument for elucidating the formation of the stable sk-membered chelate ring structure in the complexes. The EPR spectrum of the Gd (III) complex exhibits the “U ” spectral feature and “zero field effect ”. On the basis of them, the crystal field strength and the local symmetry around Gd3 + in the complex have been discussed.