一种香豆素类荧光探针的合成及其性能研究

本文设计合成了一种基于香豆素的荧光探针L,通过氢谱、质谱对其结构进行表征。该探针在DMSO/H_2O(体积比9∶1)体系中对Co~(2+)和Ni~(2+)具有较好的选择性和灵敏度。Co~(2+)和Ni~(2+)的加入使得探针L的荧光发射发生猝灭,其他金属离子未对探针的荧光产生明显的影响。探针L与Co~(2+)和Ni~(2+)的配位比均为1∶2,其对Co~(2+)和Ni~(2+)的检出限分别为1.002×10~(-7)和9.78×10~(-6) mol/L,结合常数分别是1.06×10~6和9.84×10~5 L·mol~(-1)。     

异烟肼缩2-羟基-1-萘甲醛酰腙Ni~(2+)荧光探针的研究

由2-羟基-1-萘甲醛与异烟肼缩合得到异烟肼缩2-羟基-1-萘甲醛酰腙(探针1)。荧光光谱实验表明:探针1是一种选择好、灵敏度高的Ni~(2+)荧光探针。当Ni~(2+)浓度在0~20μmol/L范围内,Ni~(2+)的浓度与探针1(10μmol/L)的荧光强度之间呈较好的线性关系,检出限为5.10μg/L。Job实验表明:Ni~(2+)与探针1的络合比为11,结合常数为7.83×103L/mol。     

基于咔唑-席夫碱的高选择性裸眼和荧光识别Cu~(2+)的探针

合成了一种新型基于咔唑-席夫碱识别Cu~(2+)的荧光探针L.利用紫外-可见和荧光光谱研究了探针L对阳离子的识别性能.实验结果显示,当加入Cu~(2+)时,探针L的CH_3CN溶液显示出明显的颜色变化,由黄色变为无色.这表明,利用探针L可裸眼识别Cu~(2+).通过荧光光谱分析实验发现,在CH_3CN溶剂中,探针L对Cu~(2+)具有较高的选择性和灵敏度,其荧光强度随着Cu~(2+)的浓度增大而逐渐增强,不受其它金属离子影响,抗干扰能力强.探针L与Cu~(2+)的结合常数为1.38×10~4 L/mol,检测限为2.34×10~(-7) mol/L,低于世界卫生组织(WHO)规定的饮用水中Cu~(2+)的最大含量20mmol/L.探针L在检测环境中的Cu~(2+)含量方面具有潜在应用价值.     

新罗丹明酰胺基硫脲荧光探针在水溶液中对Hg~(2+)的识别

设计并合成了一类罗丹明酰胺基硫脲Hg~(2+)荧光探针,通过~1HNMR谱和~(13)C谱进行结构表征。采用紫外-可见光谱和荧光光谱研究了探针RFS对Hg~(2+)的光谱响应。结果表明,探针罗丹明B酰胺基邻氟苯基硫脲(RFS)在水溶液中(HEPES缓冲溶液pH7.2)对Hg~(2+)表现出高选择性,并具有快速、灵敏的显色和Off-On荧光增强效应。探针与Hg~(2+)作用后,溶液颜色由无色变为红色,在1~10μmol/L范围内,探针的荧光强度与Hg~(2+)浓度呈线性关系。比较了因取代基的电子效应不同对探针灵敏度的影响,通过激光共聚焦成像实现了探针RFS在Hela细胞内对Hg~(2+)的识别检测,表明探针RFS可用于检测细胞内的汞离子。     

具比色和可逆选择性识别Cu~(2+)和S~(2-)的罗丹明化学传感器

以罗丹明B、水合肼及9-蒽甲醛为原料,合成了一种新型化学传感器AR.其在体积比为1的乙醇/水溶液中能高选择性地识别Cu~(2+),同时在557nm处有显著的紫外吸收,溶液颜色由无色变为紫色.在AR与Cu~(2+)结合后,该体系对S~(2-)显示较高的专属性,且也能引起裸眼颜色变化.此外,通过核磁滴定、EDTA滴定实验验证AR与Cu~(2+)的识别机理为可逆性识别.该探针还可制成溶液和试纸检测1mmol/L级别含Cu~(2+)水样.因此,构建了一种新的基于罗丹明B的高选择性连续识别Cu~(2+)和S~(2-)的可逆型化学传感器.     

基于2,6-二甲酰基-4-甲基苯酚的双Schiff化合物的合成及Zn~(2+)识别

以2-氨基苯并噻唑、水合肼和硫酸为原料,合成2-肼基苯并噻唑,与2,6-二甲酰基-4-甲基苯酚进行反应得到2,6-二甲酰基-4-甲基苯酚缩二(2-肼基苯并噻唑)(L),在DMF与H_2O (3:2,V:V)的混合溶液中,通过紫外和荧光测定该探针(L)对金属离子的识别性能。结果发现,该荧光探针(L)对Zn~(2+)具有较好的选择性和灵敏度,探针溶液的荧光强度与Zn~(2+)有良好的线性关系,线性方程为I=196.46+1654.12c,相关系数R~2=0.9864,检出限为38.5 nmol/L。该方法可以定量检测水中Zn~(2+)。     

铜(Ⅱ)荧光探针的合成及其识别性能研究

以水合肼和4-(二乙氨基)水杨醛为原料,通过席夫碱反应合成了Cu~(2+)荧光探针。采用荧光和紫外等方法研究了其对金属离子的识别性能。结果表明,该探针在80%(V/V)的乙醇水溶液中对Cu~(2+)有较好的选择性、灵敏度并可裸眼识别,检测限为0.32 nmol/L。     

基于4-(N, N-二乙氨基)水杨醛席夫碱类荧光探针的研究进展

4-(N,N-二乙氨基)水杨醛是染料及有机合成的重要中间体,也是具有亲水性质的生色团,其醛基常被用来制备席夫碱进而开发新颖的探针分子。本文介绍了对于一些常见离子如Al~(3+)、Cu~(2+)、Zn~(2+)、Hg~(2+)、Co~(2+)、F~-、CN~-等进行荧光识别和检测的基于4-(N,N-二乙氨基)水杨醛合成的席夫碱类荧光探针,这些探针具有较高的选择性和灵敏度,并有很好的细胞通透性和较低的细胞毒性,有一定的实用价值。本文为此类荧光探针在环境、生物、食品中的实际检测和应用研究提供了理论依据和实践基础。     

对Zn2+及S2-连续响应的罗丹明B酰肼类荧光探针的研究

该文采用简单的两步反应合成了一种新型N-(2-羟基-5-氯苯)基罗丹明B酰肼(HCPRH)分子探针,并对其进行了结构表征及荧光性能研究。结果显示,在含HCPRH分子探针的N,N-二甲基甲酰胺(DMF)溶液中加入Zn~(2+),会使其荧光显著增强,可在365 nm紫外灯下肉眼观察到体系颜色迅速由无色变为亮黄色,表明该分子探针可用于Zn~(2+)的快速、灵敏和裸眼识别,且其对Zn~(2+)具有良好的识别选择性,其它金属离子几乎不干扰HCPRH探针对Zn~(2+)的响应。采用Benesi-Hildebrand方程计算得HCPRH分子探针与Zn~(2+)之间形成了稳定的配合物,以Job?s法确定两者之间摩尔比为1∶1。根据荧光滴定的实验结果,发现HCPRH分子探针在512 nm处荧光发射峰强度变化值与Zn~(2+)浓度在10～250μmol/L之间呈良好的线性关系,对Zn~(2+)的检出限达3.6μmol/L,可用于其微量检测。另外,实验研究还表明该分子HCPRH探针可成功用于对Zn~(2+)与S~(2-)的连续荧光响应。     

基于高半胱氨酸-罗丹明类荧光探针的合成及其对水中铜离子的检测

以罗丹明6G为原料,通过引入高半胱氨酸为识别基团,合成了一种新的铜离子荧光探针RhCu,考察探针RhCu的光谱性能及其对常见离子的选择性测试,并进行了实际水样的加标回收检测。结果表明:在体积比VCH3OH/VH2O=1∶1介质中探针RhCu能高选择性的识别Cu~(2+),且受常见金属阳离子和阴离子的干扰较小,对Cu~(2+)的识别过程不可逆,实际水样检测中加标回收率为103.5%。在较宽的pH范围内,探针RhCu的荧光强度受pH的影响很小,能运用于环境中高灵敏度、高选择性的检测Cu~(2+)。     

A new rhodamine-based fluorescent chemosensor for mercury in aqueous media

A new fluorescent ‘‘on–off' chemosensor for Hg2+initiated by a derivative of rhodamine B was designed and synthesized. Compound 1 exhibited high sensitivity and selectivity for Hg2+over other commonly coexistent metal ions in aqueous media. Upon the addition of Hg2+, the spirocyclic ring of probe is opened and a significant enhancement of visible color and fluorescence in the range of 500–600 nm is observed. The colorimetric and fluorescent response to Hg2+can be conveniently detected by the naked eye, which provides a facile method for visual detection of Hg2+. From the molecular structure and spectral results of 1, an irreversible, hydrolysis, desulfurization reaction mechanism is proposed.     

Highly sensitive and selective optical chemosensor for determination of Cu2+ in aqueous solution

A highly selective and sensitive rhodamine-based colorimetric chemosensor (1) for quantification of divalent copper in aqueous solution has been investigated in this work. It was designed using salicylaldehyde hydrazone and rhodamine 6G as copper-chelating and signal-reporting groups, respectively. In environmentally friendly media (50% (v/v) water/ethanol and 10 mM NaAc–HAc neutral buffer (pH 7.0)), the sensor exhibited selective absorbance enhancement to Cu²⁺ over other metal ions at 529 nm, with a dynamic working range of 0.05–5.00 μM and a detection limit of 10 nM Cu²⁺, respectively. To achieve fluorometric determination of Cu²⁺, the Cu²⁺-induced absorbance enhancement of 1 was efficiently converted to fluorescence quenching by fluorescence inner filter effects using rhodamine B (RB) as a fluorophore. The selectivity and sensitivity of fluorescence analysis were similar to those of absorptiometric measurement. Both absorptiometric and fluorometric methods were successfully applied to the detection of Cu²⁺ in three water samples.     

A squaraine based fluorescent probe for mercury ion via coordination induced deaggregation signaling

Due to the high affinity between dithiocarbamate(DTC) and Hg2+,a fluorescent probe based on squaraine chromophore with DTC side arm for Hg2+via coordination induced deaggregation signaling has been designed and synthesized.Squaraine has a high tendency to aggregate in aqueous solution,and such self-aggregation usually results in a dramatic absorption spectral broadening with fluorescence emission quenching.The combination of the DTC side arm of the probe with Hg2+induces steric hindrance,leading to the deaggregation of the dye complex,companying with a fluorescence emission restoration.In EtOH–H2O(20:80,v/v) solution,this ‘‘turn on' fluorescent probe has high selectivity and sensitivity toward Hg2+over other metal ions,and the limit of detection for Hg2+was estimated as2.19 ? 10à8mol/L by 3s/k.     

新型水溶性罗丹明类荧光探针的合成及其对游离3价金属离子的识别

以罗丹明B为原料,设计合成一种新型水溶性荧光探针(L),并对其进行表征和光学性能研究.结果表明,探针L能在纯水体系(TRIS,pH=7.4)中快速识别游离M3+(Cr3+、Al3+、Fe3+)金属离子,为荧光增强型探针,具有灵敏度高、抗干扰能力强的特点.探针L对Cr3+、Al3+、Fe3+的荧光检测限分别为1.57×1...     

一种罗丹明衍生物的合成及其对三价金属离子(Fe~(3+)、Cr~(3+)和Al~(3+))的识别

三价金属离子(Cr~(3+)、Fe~(3+)和Al~(3+))与人体健康密切相关。目前,检测Cr~(3+)、Fe~(3+)和Al~(3+)需要采用不同的荧光探针,增加了检测成本和检测时间。发展能够同时检测Cr~(3+)、Fe~(3+)和Al~(3+)的高灵敏度和强抗干扰能力的荧光探针具有非常重要的意义。本文以罗丹明B为原料,合成和表征了一种罗丹明类荧光增强型探针(P),并研究了其光谱性质。研究表明,在V(甲醇)∶V(水)=9∶1体系中对三价金属离子Fe~(3+)、Cr~(3+)和Al~(3+)具有较高的选择性,不受其它二价金属离子及一价金属离子的影响,抗干扰能力强。同时,探针P对三价金属离子具有较高的灵敏度,对Cr~(3+)、Al~(3+)和Fe~(3+)的检测限分别为3.0×10~(-4)、2.7×10~(-4)和1.0×10~(-4)mol/L,表明其可用于Cr~(3+)、Al~(3+)和Fe~(3+)的检测。     

A Highly Selective Fluorescent Chemosensor for Cu2+

A new Zn²⁺ probe L2-Zn(L2=naphthofuran carbonylhydrazone derivant) was synthesized as a fluorescence chemosensor for Cu²⁺, by which Cu²⁺ ion could be detected with high selectivity and sensitivity in a wide pH range via a displacement “turn-off” signaling strategy. Whereas the coordination between Zn²⁺ and L2 resulted in a considerable enhancement of typical luminescence of a naphthalofuran group in complex L2-Zn, the addition of Cu²⁺ ion led to a dramatic decrease in the emission intensity of probe L2-Zn at about 503 nm(excitation at 423 nm). The competitive fluorescent experiments showed that other metal ions, such as Hg²⁺, Fe³⁺, Ag⁺, Ca²⁺, Co²⁺, Ni²⁺, Cd²⁺, Pb²⁺, Zn²⁺, Cr³⁺ and Mg²⁺ could not impact the detection of Cu²⁺. The detection limit of the novel probe L2-Zn for Cu²⁺ ion was as low as 2.3×10^-7 mol/L, which is far lower than the guideline value of 1.6×10^-5 mol/L of the United States Environmental Protection Agency.     

Cr3+比色荧光探针的合成及细胞成像应用

以2,3,3-三甲基-3H-苯并[e]吲哚和对二甲氨基苯甲醛为原料, 乙醇作溶剂, 在酸性催化条件下, 通过一步反应合成了比色荧光探针B. 在EtOH/HEPES(pH=7.4)体积比为9∶1的混合体系中, 向探针B溶液中加入Cr ³⁺后, 溶液颜色由淡黄色变为紫红色, 说明探针B可以对Cr ³⁺进行裸眼识别. 紫外-可见吸收光谱和荧光发射光谱分析表明, 探针B对Cr ³⁺的选择性好、 灵敏度高且对EDTA有良好的接力识别. 探针B对Cr ³⁺的结合常数K_a=0.28×10 ² mol/L, 检出限为1.90×10 ^-8 mol/L, 该检出限低于世界卫生组织(WHO)规定的饮用水中Cr ³⁺的最大含量(9.60×10 ^-8 mol/L). 利用荧光发射光谱对实际水样中Cr ³⁺的浓度进行了定量检测. 探针B也可应用于对活细胞中Cr ³⁺的检测, 具有较好的应用前景和实用价值.     

Rational Design of Ratiometric Fe3+ Fluorescent Probes Based on FRET Mechanism

As the most abundant transition metal element in mammals, iron(Fe) plays a vital role in life activities. It is of great significance to study the variation of Fe³⁺ level in living organisms. In virtue of the advantages of high sensitivity, good selectivity and low damage to living systems, the fluorescence detection of Fe³⁺ has attracted much attention. Compared with the intensity-based fluorescent probe, the ratiometric fluorescent probe has less interference of environmental and can realize quantitative detection. In this study, four ratiometric Fe³⁺ fluorescent probes, R1, R2, R3 and R4_, were designed and synthesized using fluorescence resonance energy transfer(FRET) mechanism to achieve quantitative detection of Fe³⁺. In the FRET systems, 1,8-naphthalimide fluorophore derivatives were adopted as donors while rhodamine B derivatives were selected as receptors. The connection sites of the donor and acceptor in R3 and R4 are different from those in R1 and R2. All the four probes showed good response and selectivity to Fe³⁺. The energy transfer efficiencies of R3 and R4 were obviously higher than those of R1 and R2. This work provided a promising strategy for the development of fluorescent ratiometic Fe³⁺sensors.     

Selective transport of silver ions through bulk liquid membrane using Victoria blue as carrier

Transport of Ag⁺ as Ag(CN)₂⁻ ions through a bulk liquid membrane is reported. The bulk liquid membrane used is a solution of Victoria blue (VB) in chloroform. The effects of pH of the source phase, cyanide concentration in the source phase, sodium hydroxide in the receiving phase, and VB concentration in the organic phase on the efficiency of the transport system were studied. The above system has a high selectivity for Ag⁺ and can selectively and efficiently transport Ag(CN)₂⁻ ion from aqueous solutions containing other cations such as alkali and alkaline earths, Zn²⁺, Pd²⁺, Cu²⁺, Cd²⁺,Hg²⁺, Co²⁺, Fe²⁺, Pb²⁺, Ni²⁺, and Al³⁺.     

具有荧光增强性能的罗丹明B衍生物的合成及其对汞离子的检测

利用汞离子可以诱导罗丹明B衍生物的螺环结构发生开环反应并产生荧光增强效果这一特性,设计并合成了两种新型的荧光化学传感器2-噻吩甲醛罗丹明B酰肼(RhBTh)和苯甲醛罗丹明B酰肼(RhBAr),并研究了二者在汞离子检测中的应用.研究结果表明,RhBTh与RhBAr对汞离子均表现出非常好的荧光增强效果,检测过程中其它金属离子不会对检测结果产生明显的干扰.二者对汞离子的检测限分别为7.8 nmol/L和12.5 nmol/L.实验表明RhBTh和RhBAr对汞离子均具有良好的灵敏度和选择性.