Crystal structures of some lanthanide(III) complexes with acylhydrazone and their coordination chemistry |
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| Authors: | L J Wang H L Guo W T Wu Sh Y He |
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| Institution: | (1) Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871, People’s Republic of China; |
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| Abstract: | Three new lanthanide(III) complexes with N-(2-propionic acid)-salicyloylhydrazone (H2L, C10H10N2O4) ligand La(HL)2(NO3)(H2O)2]3 ·4H2O(I), Gd(HL)3] · 2(C2H5)3 N(II) and Er(L)(HL)(H2O)2] · 2H2O(III) has been synthesized and characterized by elemental analyses, IR, UV, and molar conductivity. The crystal structures of
three complexes have been determined by X-ray single-crystal diffractometer. In complex I, the La3+ ion is ten-coordinated by two tridentate ligands, one bidentate nitrate, and two water molecules. In complex II, the Gd3+ ion has a coordination number of nine by three tridentate ligands. In complex III, the Er3+ ion is eight-coordinated by two tridentate ligands and two water molecules. In all structures, tridentate ligands are coordinated
by carboxyl O and acyl O atoms and azomethine N atom to form two stable five-membered rings sharing one side in the keto mode
as indicated by the results of crystal structures and infrared spectral analysis. |
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