英语翻译Zn2+ Selectivity.The selectivity of the fluorescent resp

英语翻译
Zn2+ Selectivity.The selectivity of the fluorescent response of ZTRS to zinc ions was then examined.Figure 2a shows thefluorescence response of ZTRS to various metal ions in aqueous
solutions (CH3CN/0.5 M HEPES,pH 7.4 ) 50:50).Selective and large fluorescent enhancements (FE) were observed upon addition of Cd2+ (21 fold) and Zn2+ (22 fold) to the solution of ZTRS.Notably,Cd2+ induced a blue-shift in the emission of ZTRS to 446 nm (blue fluorescence,ε ) 84700 M-1 cm-1,Φ
) 0.34),while Zn2+ caused a red-shift to 514 nm (green fluorescence,ε ) 87500 M-1 cm-1,Φ ) 0.36).This difference in response allows ZTRS to easily distinguish between Cd2+ and Zn2+ in aqueous solution,even with the naked eye (Figure
3).The Job plots indicate the ZTRS/Zn2+ and ZTRS/Cd2+ complexes all have 1:1 stoichiometry (Figure 2b and Supporting Information,Figure S1).The apparent dissociation constants
(Kd) of ZTRS with Zn2+ and Cd2+ were determined by
fluorescence spectroscopy as shown in Figure 4 to be 5.7 nM
and 48.5 nM,respectively.metal ions in the same way in DMSO aqueous solutions
(DMSO/0.5 M HEPES,pH 7.4 ) 10:90) (Supporting Informa- tion,Figure S2).Also,it is worth mentioning that even in 100% aqueous solutions ZTRS can selectively sense Zn2+ (8 fold:ε
) 68600 M-1 cm-1,Φ ) 0.096) and Cd2+ (7 fold:ε ) 63500
M-1 cm-1,Φ ) 0.084) with less enhanced fluorescence
(Supporting Information,Figure S3).The good water solubility of ZTRS demonstrates its potential for biological imaging.

Zn2＋的选择性.然后就ZTRS对锌离子的荧光响应的选择性进行了研究.图2a示出了ZTRS对含水溶液（CH3CN/0.5M HEPES,pH7.4＝50：50）中各种不同金属离子的荧光响应.在向ZTRS的溶液添加Cd2＋（21倍）和Zn2＋（22倍）时,观察到了有选择性而大的荧光增强.特别是Cd2＋在ZTRS的发射上感生了到446nm的蓝移（蓝色荧光,ε＝84700M-1,Φ=0.34）,而Zn2＋引起红移到514nm（绿色荧光,ε＝87500M－1cm－1,Φ=0.36）.这一响应上的差异使ZTRS即使用肉眼都能很容易地区分含水溶液中的Cd2＋和Zn2＋（图3）.这些工作曲线表明ZTRS/Zn2＋和ZTRS/Cd2＋络合物都具有1：1的化学计量（图2b和支持信息的图S1）.带Cd2＋和Zn2＋的ZTRS的表观解离常数(Kd)用荧光光谱法确定,就如图4所示的那样,分别为5.7nM和48.5nM18b.此外,ZTRS在DMSO含水溶液（DMSO/0.5M HEPES,pH7.4＝10：90）（支持信息的图S2）.同样,值得提起的是,即使在100％含水溶液中,ZTRS也能以较少增强的荧光选择性地感应Zh2+（8倍：ε＝68600M－1cm－1,Φ=0.096）和Cd2＋（7倍：ε＝63500M－1cm－1,Φ=0.084）（支持信息,图S3）.ZTRS良好的水溶性证明了其用于生物成像的潜力.