Spinel structure ferrites MFe2O4(M = Co,Ni,Mn,Zn) nano-octahedrons have been fabricated by a simple hydrothermal route under mild conditions,using sodium citrate as addition agent.The products were characterized in de...Spinel structure ferrites MFe2O4(M = Co,Ni,Mn,Zn) nano-octahedrons have been fabricated by a simple hydrothermal route under mild conditions,using sodium citrate as addition agent.The products were characterized in detail by XRD,TEM and ED.The growth process was also monitored by NaOH concentration,temperature and citrate-dependent observations.It was found that the reaction temperature had no obvious influence on the morphology of the products,while NaOH concentration had great effect on the morphology of the final products.The edge size of octahedral ferrites was estimated to 100-200 nm at the hydrothermal temperature of 180 ℃.Vibrating sample magnetometer was used to characterize magnetic properties of octahedral ferrites at room temperature.Magnetic measurements showed that these ferrites exhibited obvious ferromagnetic behaviors.展开更多
The compound 2,4,4,9,11,11-hexamethyl-1,5,8,12-tetraazacyclotetradecane-1,8-diene(1) was synthesized by new method with high yield(95.2%),and its complex with Cu(II) and SCN-was also obtained.The structures of both th...The compound 2,4,4,9,11,11-hexamethyl-1,5,8,12-tetraazacyclotetradecane-1,8-diene(1) was synthesized by new method with high yield(95.2%),and its complex with Cu(II) and SCN-was also obtained.The structures of both the ligand and the complex were characterized by IR,elemental analysis,and X-ray diffraction.The crystal of the title compound(2) belongs to monoclinic system,space group P21/n,Mr=501.53,a=1.28883(11) nm,b=1.13462(10) nm,c=1.58128(13) nm,β=102.7430(10)°,V=2.2554(3) nm3,Z=4,d=1.477g/ cm3,F(000)=1052.R1=0.0360,wR2=0.0976[I>2σ(Ⅰ)].The copper atom is five–coordinated with four nitrogen atoms from compound 1 and one nitrogen atom from thiocyanate to form a tetragonal pyramid structure.展开更多
文摘Spinel structure ferrites MFe2O4(M = Co,Ni,Mn,Zn) nano-octahedrons have been fabricated by a simple hydrothermal route under mild conditions,using sodium citrate as addition agent.The products were characterized in detail by XRD,TEM and ED.The growth process was also monitored by NaOH concentration,temperature and citrate-dependent observations.It was found that the reaction temperature had no obvious influence on the morphology of the products,while NaOH concentration had great effect on the morphology of the final products.The edge size of octahedral ferrites was estimated to 100-200 nm at the hydrothermal temperature of 180 ℃.Vibrating sample magnetometer was used to characterize magnetic properties of octahedral ferrites at room temperature.Magnetic measurements showed that these ferrites exhibited obvious ferromagnetic behaviors.
文摘The compound 2,4,4,9,11,11-hexamethyl-1,5,8,12-tetraazacyclotetradecane-1,8-diene(1) was synthesized by new method with high yield(95.2%),and its complex with Cu(II) and SCN-was also obtained.The structures of both the ligand and the complex were characterized by IR,elemental analysis,and X-ray diffraction.The crystal of the title compound(2) belongs to monoclinic system,space group P21/n,Mr=501.53,a=1.28883(11) nm,b=1.13462(10) nm,c=1.58128(13) nm,β=102.7430(10)°,V=2.2554(3) nm3,Z=4,d=1.477g/ cm3,F(000)=1052.R1=0.0360,wR2=0.0976[I>2σ(Ⅰ)].The copper atom is five–coordinated with four nitrogen atoms from compound 1 and one nitrogen atom from thiocyanate to form a tetragonal pyramid structure.
