A lanthanide-complex-based ratiometric luminescence probe specific for peroxynitrite (ONOO(-)), 4'-(2,4-dimethoxyphenyl)-2,2':6',2''-terpyridine-6,6''-diyl]bis(methylenenitrilo)tetrakis(acetate)-Eu(3+)/Tb(3+) ([Eu(3+)/Tb(3+)(DTTA)]), has been designed and synthesized. Both [Eu(3+)(DTTA)] and [Tb(3+)(DTTA)] are highly water soluble with large stability constants at approximately 10(20), and strongly luminescent with luminescence quantum yields of 10.0 and 9.9%, respectively, and long luminescence lifetimes of 1.38 and 0.26 ms, respectively. It was found that the luminescence of [Tb(3+)(DTTA)] could be quenched by ONOO(-) rapidly and specifically in aqueous buffers, while that of [Eu(3+)(DTTA)] did not respond to the addition of ONOO(-). Thus, by simply mixing [Eu(3+)(DTTA)] and [Tb(3+)(DTTA)] in an aqueous buffer, a ratiometric luminescence probe specific for time-gated luminescence detection of ONOO(-) was obtained. The performance of [Tb(3+)(DTTA)] and [Eu(3+)/Tb(3+)(DTTA)] as the probes for luminescence imaging detection of ONOO(-) in living cells was investigated. The results demonstrated the efficacy and advantages of the new ratiometric luminescence probe for highly sensitive luminescence bioimaging application.

No abstract

The Sasa-Satsuma equation is an integrable high-order nonlinear Schrödinger (NLS) equation. It can describe the propagation of femtosecond pulses in optical fibers. Very recently, Ablowitz and Mussliman introduced a class of reverse space and reverse space-time nonlocal nonlinear integrable equations, including the reverse space nonlocal NLS equation, the real and complex reverse space-time nonlocal mKdV, et.al. So, what is nonlocal version of high-order NLS? In this talk, we introduce a reverse space-time nonlocal Sasa-Satsuma equation, i.e., a reverse space-time nonlocal high-order NL-S equation, and derive its solutions through the Darboux transformation method. Periodic solutions, and some localized solutions, such as dark soliton, W-shaped soliton, M-shaped soliton and breather soliton of the reverse space-time nonlocal Sasa-Satsuma equation are constructed. This is a joint work with Caiqin Song and Dongmei Xiao.

No abstract