以2-氨基噻唑和异氰酸酯丙基三乙氧基硅烷为原料,合成了γ-(2-噻唑脲基)丙基三乙氧基硅烷(TUPTES),并采用溶胶-凝胶工艺制备了其过渡金属配合物(PTUPTES-Cu,PTUPTES-Ni).用红外光谱、核磁共振谱、扫描电镜和能谱等分析手段进行了表征.磁性测试结果表明,两种配合物在低温下都是较好的软铁磁体,其居里-外斯温度分别为119和75 K.
The tetrameric neodymium-silsesquioxane cage complex,{[(i-C_4H_9)_7(Si_7O_(12))Nd])4NaCl},was prepared and used as precursor for the polymerization of isoprene.When activated by AlEt_3 in the presence of TMSCl,this POSS-Nd complex (POSS=polyhedral oligomeric silsesquioxane) shows a moderate activity for the polymerization,and the effects of different ratios of Al/Nd,Cl/Nd and time on the polymerization were investigated.Moreover,The POSS-Nd complex may serve as models for the silica-supported rare earth cat...
The biphenol based discrete ion-pair rare earth complexes, [Ln（EDBP）2（DME）Na（DME）3] [Ln = Er（1）, Yb（2）, Sm（3）], were prepared and used as catalysts for the ring-opening polymerization （ROP） of 2,2-dimethyltrimethylene carbonate （DTC）. Three complexes show moderate activities for the polymerization, and the catalytic activities increase in the following sequence： （Yb 〈 Er 〈 Sm）. The effect of different ratios of [DTC]/[Ln], polymerization temperature and time on the polymerization was investigated. Moreover, PDTC without ether unit developed from possible CO2 elimination was prepared.
A new method is described to synthesize phendione derivatives from 1,10-phenanthrolines using potassium bromate and 60% sulfuric acid as oxidant,which was easily applicable to scale-up.The reaction conditions are mild and the yields are excellent.The target compounds have been characterized by 1H NMR,and IR.
Ren Hua ZhengHai Chang GuoHua Jiang JiangKe Hui XuBei-Bei LiuWei Lin SunZhi Quan Shen
A novel conjugated hyperbranched polymer containing bithiazole rings （PBTADB） was synthesized by polycondensation of 1,3,5-benzenetricarboxaldehyde and 2,2＇-diamino-4,4＇-bithiazole （DABT）. The structure of the hyperbranched polymer was confirmed by FT-IR and 1H-NMR. PBTADB dissolved in organic polar solvents such as DMSO and NMP. Bithiazole tings were introduced to provide bidentate N-donor sites for binding metal ions. The metal complexes were prepared by chelation of the polymer with Co2＋ and Sm3＋. The magnetic behavior of coolcdination compounds was measured as a function of magnetic field strength （0-4.8 ×106 A/m） at 5 K and as a fimetion of temperature （5-300 K） at magnetic field strength of 2.4×106 A/re. The magnetic hysteresis loops of PBTADB-Sm3＋ and PBTADB-Co2＋ showed the typical ＇S＇ shape at 5 K with the Curie-Weiss temperature To = 96 K and 41 K respectively. The results show that they exhibit properties of soft ferromagnetic materials.
Based on the polycondensation of bifunctional 2,2′-diamino-4,4′-bithiazole(DABT) and trifunctional 1,3,5-benzenetricarbonyl trichloride (BTC),a novel hyperbranched aromatic polyamide PBD was synthesized with excellent solubility and good thermal stability.The structure of the polymer was confirmed by FT-IR and 1H NMR spectrum.The calculated degree of branching of our product was 52%.By exploring the influence of several different solvent systems,the yield of the polymer increased in the solvent system of DMAc/LiCl.Two kinds of metal complexes were obtained by chelation of the polyamide with Cu2+ and Ni2+,and the metal contents of the complexes were determined by complexometric titration.The magnetic behaviors of the complexes were examined as a function of magnetic field strength at 5 K,and as a function of temperature (5–300 K) at a magnetic field strength of 2.4 × 106 A/m.The results indicated that the complexes were soft ferromagnetic materials with Curie-Weiss temperature at 102 K and 53 K,respectively.
Two poly(Schiff base)s (PDBT and PDPE) were synthesized by polycondensation of 1,10-phenanthroline-5,6- dione (PD) with 2,2′-diamino-4,4′-bithiazole (DABT) and 4,4′-diaminodiphenyl ether (DAPE),respectively.The structures of the polymers were determined by FTIR and element analysis.The metal (Fe^(2+),Ni^(2+)) complexes were prepared from the polymers with FeSO_4 or NiSO_4,and the metal contents of the complexes were measured by complexometric titration.The magnetic behaviors of the complexes were examined a...
