麻烦翻译下Figure 1 displays the emission spectra
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麻烦翻译下Figure 1 displays the emission spectra
Figure 1 displays the emission spectra changes of QB upon
the addition of an increasing amount of Zn2+ and Cd2+. Free
QB showed weak fluorescence emission at 405 nm upon
excitation at 295 nm (ε ) 0.87 × 104 M-1 cm-1, Φ0 ) 0.057)
in buffer solution because of the efficient PET quenching
from the DPA moiety to the quinoline fluorophore. Remarkable
fluorescence enhancements were detected upon the
addition of Zn2+ and Cd2+, respectively. Upon binding Zn2+,
QB showed a larger emission red-shift of 53 nm from 405
to 458 nm with an isoemissive point at 400 nm (Figure 1a),
indicating that a promoted ICT process occurred with
consequent ratiometric fluorescent signals. The ratio of
emission intensities (F458 nm/F380 nm) varies from 0.6 to 12
and is saturated up to a molar ratio (QB/Zn2+) of 1:1 (Figure
1b). In contrast, upon binding Cd2+, only enhanced fluorescent
intensity (ΦCd ) 0.22) with a smaller wavelength shift
(20 nm), but without an isoemissive point, were observed
(Figure 1c), suggesting that sensor QB recognizes Cd2+
principally based on the CHEF mechanism. The titration
curves as shown in Figure 1b,d demonstrate the high binding
affinities12 and 1:1 complexes between Zn2+, Cd2+, and QB.
To obtain an insight into the sensing properties of QB
toward metal ions, we investigated the fluorescence titration
of different ions in CH3CN/H2O buffer solution (Figure 2).
Quenching effects were observed when heavy metal ions of
Co2+, Ni2+, Cu2+, Hg2+, and Pb2+ were added, as observed
in other quinoline-DPA-based sensors. Addition of Mg2+,
Ca2+, and Na+ exerted no or little effect on the emission of
QB, even at high concentration (1 mM). As expected,
remarkable fluorescence changes were detected upon the
addition of either Zn2+ or Cd2+. The Zn2+-selective ratiometric
response (F458nm/F380nm up to 12) of QB was clearly
observed (Figure 2b) and was not interfered by the presence
of Mn2+, Fe3+, Mg2+, Ca2+, K+, and Na+ (Figures S4 and
S5, Supporting Information). Considering the distinct fluorescent
enhancement upon binding Cd2+, QB can also be
used as a CHEF Cd2+-selective sensor. In this case, other
metals behave similarly as in the case of Zn2+ (Figure S3,
Supporting Information). These results suggest that QB had
good selectivity for Zn2+ and Cd2+
Figure 1 displays the emission spectra changes of QB upon
the addition of an increasing amount of Zn2+ and Cd2+. Free
QB showed weak fluorescence emission at 405 nm upon
excitation at 295 nm (ε ) 0.87 × 104 M-1 cm-1, Φ0 ) 0.057)
in buffer solution because of the efficient PET quenching
from the DPA moiety to the quinoline fluorophore. Remarkable
fluorescence enhancements were detected upon the
addition of Zn2+ and Cd2+, respectively. Upon binding Zn2+,
QB showed a larger emission red-shift of 53 nm from 405
to 458 nm with an isoemissive point at 400 nm (Figure 1a),
indicating that a promoted ICT process occurred with
consequent ratiometric fluorescent signals. The ratio of
emission intensities (F458 nm/F380 nm) varies from 0.6 to 12
and is saturated up to a molar ratio (QB/Zn2+) of 1:1 (Figure
1b). In contrast, upon binding Cd2+, only enhanced fluorescent
intensity (ΦCd ) 0.22) with a smaller wavelength shift
(20 nm), but without an isoemissive point, were observed
(Figure 1c), suggesting that sensor QB recognizes Cd2+
principally based on the CHEF mechanism. The titration
curves as shown in Figure 1b,d demonstrate the high binding
affinities12 and 1:1 complexes between Zn2+, Cd2+, and QB.
To obtain an insight into the sensing properties of QB
toward metal ions, we investigated the fluorescence titration
of different ions in CH3CN/H2O buffer solution (Figure 2).
Quenching effects were observed when heavy metal ions of
Co2+, Ni2+, Cu2+, Hg2+, and Pb2+ were added, as observed
in other quinoline-DPA-based sensors. Addition of Mg2+,
Ca2+, and Na+ exerted no or little effect on the emission of
QB, even at high concentration (1 mM). As expected,
remarkable fluorescence changes were detected upon the
addition of either Zn2+ or Cd2+. The Zn2+-selective ratiometric
response (F458nm/F380nm up to 12) of QB was clearly
observed (Figure 2b) and was not interfered by the presence
of Mn2+, Fe3+, Mg2+, Ca2+, K+, and Na+ (Figures S4 and
S5, Supporting Information). Considering the distinct fluorescent
enhancement upon binding Cd2+, QB can also be
used as a CHEF Cd2+-selective sensor. In this case, other
metals behave similarly as in the case of Zn2+ (Figure S3,
Supporting Information). These results suggest that QB had
good selectivity for Zn2+ and Cd2+
图1示出了QB在添加数量逐渐增加的Zn2+和Cd2+时发射谱的变化.自由QB在于缓冲溶液中在295nm(ε=0.87×104 M-1cm-1,Φ0=0.057)下激励时,在405nm处显示出弱的荧光发射,因为从DPA分子部分到喹啉荧光团有效地PET猝灭.在添加Zn2+和Cd2+时,分别检测到明显的荧光增强.在结合Zn2+时,QB显示出53nm的较大红色偏移,从405到458nm,在400nm处有一个等发射点(图1a),表明了由作为结果发生的比率荧光信号产生了得到促进的ICT过程.发射光强的比率(F458nm/F380nm)从0.6变到12,直至1:1的摩尔比(QB/Zn2+)时饱和.与此相反,在结合Cd2+时,只观察到伴随较小波长偏移的增强的荧光光强(Φcd=0.22),而没有等发射点(图1c),表明了传感器QB主要根据CHEF机理识别Cd2+.如图1b、d所示的滴定曲线证明了高的结合亲和力12和Zn2+、Cd2+和QB之间1:1的络合物.
为了进一步了解QB对金属离子的传感性质,我们研究了CH3CN/H2O缓冲溶液中不同离子的荧光滴定(图2).当添加Co2+、Ni2+、Cu2+、Hg2+、和Pb2+等重金属离子时观察到
了猝灭效应,就像在其他喹啉—DPA基传感器上观察到的那样.添加Mg2+、Ca2+和Na+对QB的发射不施加或几乎不施加影响,即使在高浓度(1mM)下也是如此.如预料的那样,在添加Zn2+和Cd2+时,都能检测到明显的荧光变化.QB对Zn2+的选择性比率响应(F458nm/F380nm直至12)被清楚地观察到(图2b),而且不受存在Mn2+、Fe3+、Mg2+、Ca2+、K+和Na+等离子的干扰(支持信息图S4和S5).考虑在结合Cd2+时明显的荧光增强,QB也可以用作CHEF Cd2+选择性传感器.在这种情况下,其他金属的性状类似于在Zn2+的情况下(支持信息图S3).这些结果告诉我们,QB对Zn2+和Cd2+有良好的选择性.
为了进一步了解QB对金属离子的传感性质,我们研究了CH3CN/H2O缓冲溶液中不同离子的荧光滴定(图2).当添加Co2+、Ni2+、Cu2+、Hg2+、和Pb2+等重金属离子时观察到
了猝灭效应,就像在其他喹啉—DPA基传感器上观察到的那样.添加Mg2+、Ca2+和Na+对QB的发射不施加或几乎不施加影响,即使在高浓度(1mM)下也是如此.如预料的那样,在添加Zn2+和Cd2+时,都能检测到明显的荧光变化.QB对Zn2+的选择性比率响应(F458nm/F380nm直至12)被清楚地观察到(图2b),而且不受存在Mn2+、Fe3+、Mg2+、Ca2+、K+和Na+等离子的干扰(支持信息图S4和S5).考虑在结合Cd2+时明显的荧光增强,QB也可以用作CHEF Cd2+选择性传感器.在这种情况下,其他金属的性状类似于在Zn2+的情况下(支持信息图S3).这些结果告诉我们,QB对Zn2+和Cd2+有良好的选择性.
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