Heterometallic copper(Ⅱ)-lanthanide(Ⅲ) complexes have been made with a variety of exclusively O-donor ligands including betaines (zwitterionic carboxylates) and chloroac-etate,which are dinuclear CuLn,tetranuclear C...Heterometallic copper(Ⅱ)-lanthanide(Ⅲ) complexes have been made with a variety of exclusively O-donor ligands including betaines (zwitterionic carboxylates) and chloroac-etate,which are dinuclear CuLn,tetranuclear Cu2Ln2,pen-tanuclear Cu2Ln2,and octadecanuclear Cu12Ln6 complexes.Hie results show that subtle changes in both the carboxylates and acidity of the reaction solution can cause drastic changes in the structures of the products.Magnetic studies exhibit that shielding of the Ln3+ 4f electrons by the outer shell electrons is very effective to preclude significant coupling interaction between the Ln3+ 4f electrons and Cu2+ 3d electrons in either a mono-atomic hydroxide-bridged,or a carboxylate-bridged system.展开更多
The particle sizes of ultrafine powders are between cluster and fine powders, with theparticle diameters generally in the range of 1--100nm. When compared with commonmaterials consisting of bigger particles, materials...The particle sizes of ultrafine powders are between cluster and fine powders, with theparticle diameters generally in the range of 1--100nm. When compared with commonmaterials consisting of bigger particles, materials consisting of nanometer-size particleshave many special properties. These include small-sized effect, surface and interface展开更多
基金Project supported by Guangdong Natural Science Foundationthe National Natural Science Foundation of China (No. 29625102)
文摘Heterometallic copper(Ⅱ)-lanthanide(Ⅲ) complexes have been made with a variety of exclusively O-donor ligands including betaines (zwitterionic carboxylates) and chloroac-etate,which are dinuclear CuLn,tetranuclear Cu2Ln2,pen-tanuclear Cu2Ln2,and octadecanuclear Cu12Ln6 complexes.Hie results show that subtle changes in both the carboxylates and acidity of the reaction solution can cause drastic changes in the structures of the products.Magnetic studies exhibit that shielding of the Ln3+ 4f electrons by the outer shell electrons is very effective to preclude significant coupling interaction between the Ln3+ 4f electrons and Cu2+ 3d electrons in either a mono-atomic hydroxide-bridged,or a carboxylate-bridged system.
基金National Natural Science Foundaion of ChinaChinese Academy of Sciences
文摘The particle sizes of ultrafine powders are between cluster and fine powders, with theparticle diameters generally in the range of 1--100nm. When compared with commonmaterials consisting of bigger particles, materials consisting of nanometer-size particleshave many special properties. These include small-sized effect, surface and interface
