A laser trapping-microspectroscopy technique combined with excitation energy transfer from a fluorescent cationic dye (Rhodamine B, RB+) to a non-fluorescent cationic dye (Malachite Green, MG+) was employed to study p...A laser trapping-microspectroscopy technique combined with excitation energy transfer from a fluorescent cationic dye (Rhodamine B, RB+) to a non-fluorescent cationic dye (Malachite Green, MG+) was employed to study pH effects on the diffusion coefficients of MG+ (D(MG+)) in single cation-exchange resin microparticles with the diameters of 16 μm. When RB+-pre-adsorbed resin particles were soaked in an aqueous MG+ solution, the RB+ fluorescence was quenched gradually with the soaking time. The time course of the quenching efficiency of RB+ by MG+ was then used to evaluate the D(MG+) value in the particle. The D(MG+) value increased from 1.1 × 10-11 to 4.3 × 10-11 cm2.s–1 on going the solu- tion pH value from 9 to 4. The results were explained reasonably by a Donnan electric potential model.展开更多
The development of water-soluble hexanuclear cluster complexes of low toxicity is a promising task due to their potential biomedical applications such as bioimaging and photodynamic therapy.Herein,we present the synth...The development of water-soluble hexanuclear cluster complexes of low toxicity is a promising task due to their potential biomedical applications such as bioimaging and photodynamic therapy.Herein,we present the syntheses of two new water-soluble hexarhenium cluster complexes with terminal amphiphilic phosphine ligands,and delineate their photoluminescence and X-ray excited optical luminescence(XEOL)properties.These cluster complexes,namely[{Re_(6)Q_(8)}(PPh_(2)CH_(2)CH_(2)COO)_(6)]^(4−)(Q=S(1);Se,(2)),have the least cytotoxicity among all the tested hexanuclear metal-clusters,are capable of penetrating into cells and exhibit moderate photodynamic toxicity toward Hep-2 cells.展开更多
文摘A laser trapping-microspectroscopy technique combined with excitation energy transfer from a fluorescent cationic dye (Rhodamine B, RB+) to a non-fluorescent cationic dye (Malachite Green, MG+) was employed to study pH effects on the diffusion coefficients of MG+ (D(MG+)) in single cation-exchange resin microparticles with the diameters of 16 μm. When RB+-pre-adsorbed resin particles were soaked in an aqueous MG+ solution, the RB+ fluorescence was quenched gradually with the soaking time. The time course of the quenching efficiency of RB+ by MG+ was then used to evaluate the D(MG+) value in the particle. The D(MG+) value increased from 1.1 × 10-11 to 4.3 × 10-11 cm2.s–1 on going the solu- tion pH value from 9 to 4. The results were explained reasonably by a Donnan electric potential model.
基金supported by the Russian Science Foundation[grant no.15-15-10006]the Czech Science Foundation[grant no.18-05076S]the Ministry of science and higher education of RF[no.0333-2017-0002].
文摘The development of water-soluble hexanuclear cluster complexes of low toxicity is a promising task due to their potential biomedical applications such as bioimaging and photodynamic therapy.Herein,we present the syntheses of two new water-soluble hexarhenium cluster complexes with terminal amphiphilic phosphine ligands,and delineate their photoluminescence and X-ray excited optical luminescence(XEOL)properties.These cluster complexes,namely[{Re_(6)Q_(8)}(PPh_(2)CH_(2)CH_(2)COO)_(6)]^(4−)(Q=S(1);Se,(2)),have the least cytotoxicity among all the tested hexanuclear metal-clusters,are capable of penetrating into cells and exhibit moderate photodynamic toxicity toward Hep-2 cells.
