| Since rare earth metals have special electronic configuration, they can form many compounds with the organic ligands which contian O, S, N, and so on. These compounds have not only a variety of structures but also special magnetic, electric and optical properties. Therefore, they can be extensively used in many fields such as petrochemistry, fluorescence materials, special glass, polymer materials, catalyst as specific organic reactions, and have potential application in medicine and biological materials.As an important organic ligand, 2-mercaptobenzothiazole(mbt) is used to synthesize a series of rare earth compounds with biphosphonate ligand. We have obtained compound Zn4O(C7H5NS2)6. The synthesis of this compound was carried out by the reaction of CeCl3 (0.1128 g, 0.3 mmol), CH2[P(O)(OiPr)2]2 (0.1182 g, 0.3mmol) and mbt (C7H5NS2) (0.0501 g, 0.3 mmol) in EtOH/CH2Cl2 (10 mL, v/v, 1:1).Lanthanide (Ⅲ) trifluoromethane sulfonate (Ln(OTf)3) was investigated as catalysts for the acetylation of starch. Three rare earth complexes [CeL4](OTf)3·2H2O,[Dy(OTf)2L2(H2O)2](OTf)(CH3CN) and [DyL4](OTf)3·L·2H2O were prepared by the reaction of Ln(OTf)3(Ln=Ce,Dy) and (iPrO)2P(O)CH2P(O)(iPrO)2. Their compositions and properties were characterized by element analysis, infrared spectra , NMR spectroscopy and DT-TGA. The coordination modes of rare earth complexes with diphosphonic ligand have also been discussed.In order to study properties of the biphosphonate ligand, we have synthesized chiral tetraalkylmethylenediphosphonate by the reaction of methylenebis(phosphonic dichloride) and chiral alcohol, which has been characterized by element analysis, infrared spectra, 1H NMR, 31P NMR and CD spectra. |
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