联吡啶桥联聚倍半硅氧烷及其镍(Ⅱ)、铽(Ⅲ)配合物的合成与磁性能

Synthesis and Magnetic Properties of Novel Nickel(Ⅱ) and Terbium(Ⅲ)-Dipyridyl Coordination Bridged Polysilsesquioxane

合成了一种新型含联吡啶基桥联倍半硅氧烷前驱体,通过溶胶-凝胶工艺,在稀盐酸催化下,分别与镍盐(醋酸镍)或铽盐(氯化铽)反应,制备了联吡啶基桥联聚倍半硅氧烷及其金属配合物,并对聚合物及其配合物进行了结构表征.结果表明,金属离子与配体成功络合.扫描电镜照片显示,合成的聚合物和金属配合物为粒径均一、形状规则的球状粒子.磁性能研究结果表明,在低温区两者都具有铁磁性,其中镍(Ⅱ)配合物具有较大的矫顽力、剩余磁化强度及磁滞回线面积,表现出硬铁磁性,而铽(Ⅲ)配合物具有很小的矫顽力、剩余磁化强度及磁滞回线面积,表现出软铁磁性.

A novel bipyridine-bridged polysilsesquioxane was synthesized and its metal-coordination polymers were prepared by sol-gel technology from bipyridine-bridged silsesquioxane and the nickel salt（nickel acetate） or terbium salt（terbium chloride） under the catalysis of diluted hydrochloric acid.The structures of polymer and metal-coordination polymer were verified with infrared ray spectrometry,ultraviolet spectrometry and elemental analysis.Meanwhile,the scanning electron microscope（SEM） results suggested that the homogeneous and spherical particles were formed.Finally,The magnetic properties of the two coordinated polymers were tested.The results show that both exhibited ferromagnetism in low temperature.Ni2＋-coordination polymer was a hard-ferromagnet due to its large values of coercive force,remanent magnetization and area of magnetic hysteresis loop.However,Tb3＋-coordination polymer was a soft-ferromagnet ascribed to its small values of coercive force,remanent magnetization and area of magnetic hysteresis loop.