| One divalent samarium complex and two monochloro derivatives of lanthanide supported by the Schiff base ligand N-(2,6-diisopropylphenyl)salicylaldimine were first synthesized, and the crystal structures of the two monochlorides were determined by X-ray diffraction analysis. Their catalytic activity for the polymerization of s-caprolactone was investigated. In contrast, the two complexes of ytterbium supported by the neutral Schiff base ligands derived from 2-pyridine-carboxaldehyde and 2,6-diisopropylphenylamine and phenylamine. respectively, were synthesized. The unique sodium complex obtained upon treatment of N-(2,6-diisopropylphenyl)salicylaldimine with Na in THF was determined by X-ray diffraction analysis. The non-classic divalent erbium complex was first synthesized by the reaction of ErCl, with the THF solution of this sodium complex and its crystal structure was determined by X-ray diffraction analysis. The diallylamino lithium complex and the diallylamino ytterbium complex were first synthesized, and the crystal structure of the lithium complex was determined by X-ray diffraction analysis. The catalytic activity of the diallylamino lithium complex for the polymerization of methyl methacrylate and s-caprolactone was investigated.l.Schiff Base monochlorides of lanthanide [2-OC6H4CH=N(2,6-iPr2C6H3)]2Ln(THF)Cl[Ln=Yb(l). Er(2)] were formed by the reaction of anhydrous LnCl3 with [2-OC6H4CH=N(2,6-iPr2C6H3)]Na in 1:2 molar ratio in THF. Elemental analysis and IR characterized the two compounds. The X-ray analysis of complex 1 and 2 indicated that they are monomeric complexes, in which central metal is coordinated by two Schiff base ligands. one chloride atom and a THF molecule, andits coordination number is 6.2.Reaction of SmL with [2-OC6H4CH=N(2,6-iPr2C6H3)]Na in 1:2 molar ratio in THF gave the divalent Schiff base Sm complex: [2-OC6H4CH=N(2,6-iPr2C6H3)]2Sm(THF)2 (3), which was characterized by elemental analysis and IR.3.Reaction of anhydrous YbCl, with neutral Schiff Base ligands C5H4NCH=N(2,6-iPr2C6H3) and C5H4NCH=NC6H5 in 1:2 molar ratio in CH3CN gave the two compounds [C5H4NCH=N(2,6-'Pr2C6H3)]Yb(CH3CN)Cl3 (4) and [C5H4NCH=NC5H5]2YbCl3 (5), respectively, which were characterized by Elemental analysis and IR.4.The sodium complex [2-OC6H4CHNH(2,6-i-Pr2C6H3)Na(DME)]2 (6) was synthesized by the reaction of Schiff base 2-HOC6H4CH=N(2,6-iPr2C6H3) with excessive Na in THF. The crystals obtained from the concentrated DME solution were characterized by elemental analysis, IR and X-ray diffraction analysis. The complex has a dimeric structure bridged by two phenolate oxygen atoms.5.The non-classical divalent erbium complex [2-OC6H4CH2NH(2,6-Pr2C6H3)]4ErNa2(THF)2 (7) has been prepared by the reaction of anhydrous ErCl3 with the THF solution of sodium complex synthesized in [4] in 1:2 molar ratio. The divalent erbium complex was characterized by Elemental analysis, IR and single crystal X-ray diffraction analysis. It belongs to ion-type complex, in which the coordination numbers of erbium and sodium are 6 and 4, respectively.6.The diallylamino lithium complex {CH2=C[(2,6-iPr2C6H3)N][N(2,6-Pr2C6H3)]C=CH2}Li2(THF)4 (8) was first synthesized by the reaction of l,4-diaza-l,3-diene (2,6-iPr2C6H3)N=C(CH3)(CH3)C=N(2,6-iPr2C6H3) with LiNiPr2 in 1:2 molar ratio in THF. The complex was characterized by elemental analysis, IR and single crystalX-ray diffraction analysis. In its crystal structure, each lithium atom is coordinated by one N atom and two THF ligands, and the coordination number of lithium is 3. The ytterbium complex {CH2-C[(2,6-iPr2C6H3)N][N(2,6-iPr2C6H3)]C=CH2}2.5YbLi2(THF)4 (9) was synthesized by the reaction of anhydrous YbCl, with this lithium complex in 1:1 molar ratio in THF, which was characterized by Elemental analysis and IR.7.It was first found that the Schiff base monochloro derivatives of lanthanide (1)and (2) have a good catalytic activity for the polymerization of e-caprolactone. Using complex 1 as catalyst, the highe...
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