Premium
Studies on synthesis and magnetic resonance of lanthanide complexes with novel Schiff base derived from noncyclic polyether and β‐diketone
Author(s) -
Wu Jing,
Yao KeMin,
Hu XiaoLi,
Shen LianFang,
Yuan HanZhen
Publication year - 1999
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19990170509
Subject(s) - chemistry , schiff base , lanthanide , diketone , crystallography , electron paramagnetic resonance , chelation , crystal structure , metal , stereochemistry , nuclear magnetic resonance , inorganic chemistry , organic chemistry , ion , physics
Nine h( III) complexes with a novel Schiff base derived from diglycolamine and benzoylacetone (BZDA) have been synthesized and characterized. They can be formulated as [Ln 2 (BZDA) 3 (NO 3 ) 3 ](NO 3 ) 3 ‐nH 2 O (LnLa, Pr, Nd, Sm, n = 4; Ln = Gd, Tb, Er, Yb, Y, n = 7). Enamic form mechanism in this β‐diketone Schiff base and its Complexes were suggested and proved by IR, UV and NMR methods. The 13 C spin‐lattice relaxation time T 1 and the ratios of r(C i ‐In)/ r (c j ‐in) were measured by a 500 MHz NMR instrument for elucidating the formation of the stable six‐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 Gd 3+ in the complex have been discussed.