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Two rhodamine based probes were designed and prepared for Sn 4+ via opening of the spiro-ring to give fluorescent and colored species. The two probes exhibited a strong fluorescence enhancement upon addition of Sn 4+ while showing almost no response to other cations in CH 3 CH 2 OH/HEPES buffer solution. Probe L 1 exhibited fast selectivity toward Sn 4+ and could be completed in 1 min. Fluorescence imaging experiments of Sn 4+ in living MGC803 cells demonstrated its value of practical applications in biological systems. [ABSTRACT FROM AUTHOR]

Abstract: Carbene adduct of cyclopalladated ferrocenylimine has been successfully applied to Heck reaction of various aryl bromides with olefins. On the basis of kinetic studies, in situ 13C NMR spectra investigations and Hg poisoning experiments, it was proposed that the Heck reaction catalyzed by carbene adduct of cyclopalladated ferrocenylimine proceeded through a classical Pd(0)/Pd(II) cycle and such palladacycle was only a reservoir of the catalytically active Pd(0) species. [Copyright &y& Elsevier]