Among rare earth complexes Tb(Phen)_ x (Bipy)_((4- x ))(NO_3)_3 ( x =4,3,2,1,0) solutions (1×10 (-3) (mol·L (-1)),) the fluorescent intensity of Tb (3+) in Tb(Phen)_3(Bipy)(NO_3)_3 is strongest and that of T...Among rare earth complexes Tb(Phen)_ x (Bipy)_((4- x ))(NO_3)_3 ( x =4,3,2,1,0) solutions (1×10 (-3) (mol·L (-1)),) the fluorescent intensity of Tb (3+) in Tb(Phen)_3(Bipy)(NO_3)_3 is strongest and that of Tb (3+) in Tb(Bipy)_4(NO_3)_3 is weakest. The fluorescent intensity of Tb (3+) in (CH_3)_3Si-MCM-41-Tb(Bipy)_4(NO_3)_3 is strongest and that of Tb (3+) in MCM-41-Tb(Phen)_3(Bipy)(NO_3)_3 or (CH_3)_3Si-MCM-41-Tb(Phen)_3(Bipy)(NO_3)_3 becomes very weak. Luminescence supramolecular nanostructured materials that the guests Tb(Phen)_4(NO_3)_3 and Tb(Bipy)_4(NO_3)_3 were encapsulated in the non-polar channels of (CH_3)_3Si-MCM-41 are stronger than that encapsulated in the polar channels of MCM-41. When the guests are Tb(Phen)_3(Bipy)(NO_3)_3 and Tb(Phen)_2(Bipy)_2(NO_3)_3,the result is just opposite. The results were proved by fluorescent lifetime experiments. MCM-41-Tb(Phen)(Bipy)_3(NO_3)_3 shows two distinct exponential decays,which time constants are 168.8 and 641.1 μs and its amplitude ratio is 0.96∶1. The same as (CH_3)_3Si-MCM-41-Tb(Phen)(Bipy)_3(NO_3)_3 shows,of which are 73.2 and 590.4 μs and the amplitude ratio is 2.3∶1. The ratios of decay time and luminescence intensity of the both supramolecular systems are 2.5∶1,1∶2.5 and 1.1∶1,0.96∶1,respectively. These results indicate that interaction and selectivity between host and guest influence greatly luminescent properties of supramolecular system.展开更多
文摘Among rare earth complexes Tb(Phen)_ x (Bipy)_((4- x ))(NO_3)_3 ( x =4,3,2,1,0) solutions (1×10 (-3) (mol·L (-1)),) the fluorescent intensity of Tb (3+) in Tb(Phen)_3(Bipy)(NO_3)_3 is strongest and that of Tb (3+) in Tb(Bipy)_4(NO_3)_3 is weakest. The fluorescent intensity of Tb (3+) in (CH_3)_3Si-MCM-41-Tb(Bipy)_4(NO_3)_3 is strongest and that of Tb (3+) in MCM-41-Tb(Phen)_3(Bipy)(NO_3)_3 or (CH_3)_3Si-MCM-41-Tb(Phen)_3(Bipy)(NO_3)_3 becomes very weak. Luminescence supramolecular nanostructured materials that the guests Tb(Phen)_4(NO_3)_3 and Tb(Bipy)_4(NO_3)_3 were encapsulated in the non-polar channels of (CH_3)_3Si-MCM-41 are stronger than that encapsulated in the polar channels of MCM-41. When the guests are Tb(Phen)_3(Bipy)(NO_3)_3 and Tb(Phen)_2(Bipy)_2(NO_3)_3,the result is just opposite. The results were proved by fluorescent lifetime experiments. MCM-41-Tb(Phen)(Bipy)_3(NO_3)_3 shows two distinct exponential decays,which time constants are 168.8 and 641.1 μs and its amplitude ratio is 0.96∶1. The same as (CH_3)_3Si-MCM-41-Tb(Phen)(Bipy)_3(NO_3)_3 shows,of which are 73.2 and 590.4 μs and the amplitude ratio is 2.3∶1. The ratios of decay time and luminescence intensity of the both supramolecular systems are 2.5∶1,1∶2.5 and 1.1∶1,0.96∶1,respectively. These results indicate that interaction and selectivity between host and guest influence greatly luminescent properties of supramolecular system.
