共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
5.
以罗丹明B、水合肼、乙二醛与盐酸羟胺为原料,经缩合反应得到新型罗丹明B衍生物2-((3',6'-双(二乙基氨基)-3-氧螺[异吲哚-1,9'-氧杂蒽]-2-基)亚氨基)乙醛肟(RNEO),其结构经核磁和质谱分析表征。通过荧光实验对金属离子进行识别,研究发现,在乙腈/Tris-HCl缓冲水溶液中,RNEO可以作为荧光增强型分子探针选择性识别Cu~(2+),除了Hg~(2+)以外,受常见金属离子(Na~+,K~+,Mg~(2+),Ca~(2+),Ba~(2+),Fe~(3+),Ni~(2+),Cr3+,Cd~(2+),Pb~(2+),Ag~+,Zn~(2+))的干扰较小。探针识别Cu~(2+)后溶液颜色由无色变为紫红色,在365 nm紫外光照射下,探针溶液发出玫瑰红荧光,可以实现裸眼定性检测。建立的荧光测试方法,Cu~(2+)浓度在2.0~15.0μmol/L范围内,此探针的荧光强度与其呈现良好的线性关系。 相似文献
6.
7.
8.
《有机化学》2016,(1)
合成了一种萘酰亚胺-罗丹明新型荧光探针N,N'-罗丹明内酰乙氨基-4-吡啶乙烯基-1,8-萘酰亚胺(PNRh),并通过核磁氢谱、核磁碳谱及高分辨质谱结构表征.测定了PNRh的固体、乙醇和水的混合溶液中的荧光光谱,实验发现暗室中紫外灯下固体PNRh发出亮黄色荧光,最大发射波长为592 nm.在乙醇和水的混合溶液中,随着含水量的增加,荧光逐渐增强,当含水量达到100%时,荧光强度最大,溶液则由微弱的蓝色荧光变为暗红色的荧光.研究了荧光分子PNRh对金属离子Hg2+和Cr3+的选择性识别.实验发现PNRh具有聚集诱导荧光增强的性质,可实现对Hg2+和Cr3+的比率和双通道识别,是一种优良的Hg2+和Cr3+检测荧光探针. 相似文献
9.
设计合成了一个新的罗丹明席夫碱类荧光探针1,其结构经~1H NMR、~(13)C NMR、MS和X射线单晶衍射的验证.通过紫外-可见光谱法和荧光光谱法研究了探针1在乙醇-水(V/V=7/3,HEPES 10 mmol/L,p H=7.0)中对Hg~(2+)的识别性能.探针1通过显著的荧光增强来识别Hg~(2+),并具有良好的选择性和抗干扰能力.通过Job’s plot和MS证明了探针1和Hg~(2+)形成1∶1的配合物.探针1的荧光强度与Hg~(2+)浓度(0~50μmol/L)呈良好的线性关系,可以定量地检测该范围内的Hg~(2+).在MGC-803活细胞中的荧光显微成像表明,探针1可检测生物体内的Hg~(2+). 相似文献
10.
以1,3-交替-二羧基甲氧基硫杂杯[4]芳烃为原料,通过与罗丹明乙二胺衍生物的酰化反应得到罗丹明基团单取代的硫杂杯[4]芳烃衍生物。目标化合物结构经IR,NMR,MS及元素分析等技术表征。荧光及可见吸收光谱法研究表明化合物对Fe3+具有探针性质,在乙醇-水(1/1,V/V)Tris-HCl(pH=6.0)缓冲溶液中,对Fe3+呈现光关-开响应,并观察到显著的荧光增强和颜色变红现象。测定了Fe3+-配合物的组成、稳定常数及荧光量子产率。 相似文献
11.
A proton and optic dual-control molecular switch based on photochromic diarylethene bearing a rhodamine unit 总被引:1,自引:0,他引:1
A novel fluorescent switch based on rhodamine B and photochromic diarylethene, 1-[2-methyl-5-(4-methoxylphenyl)-3-thienyl]-2-[2-methyl-5-(4-rhodamine B hydrazine-Schiff base-phenyl)-3-thienyl]perfluorocyclopentene (1), has been successfully synthesized through the condensation of rhodamine B hydrazine and 1-[2-methyl-5-(4-methoxylphenyl)-3-thienyl]-2-[2-methyl-5-(4-formylphenyl)-3-thienyl]perfluorocyclopentene. UV and FL measurements reveal that the compound exhibits good photochromic properties responsive to proton and optic dual inputs. Upon irradiation with 297 nm light, the colorless solution of compound 1 turns blue, while the blue solution becomes colorless after irradiated with visible light (λ>450 nm). Furthermore, upon an addition of H+, the fluorescence resonance energy transfers from the rhodamine unit (FRET donor) to the closed-ring diarylethene unit (FRET acceptor), although no energy transfer occurs when the diarylethene is in the open-ring form. The emission intensity of the rhodamine can be modulated with proton and UV/vis light and molecular-level signal communication has been constructed, indicating high potentials of the compound in molecular switches or naked eye recognition systems. 相似文献
12.
Tang L Li F Liu M Nandhakumar R 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,78(3):1168-1172
The first novel rhodamine B based sensor, rhodamine B hydrazide methyl 5-formyl-1H-pyrrole-2-carboxylate Schiff base (2) capable of detecting both Cu(2+) and Hg(2+) using two different detection modes has been designed and synthesized. The metal ion induced optical changes of 2 were investigated in MeOH:H(2)O (3:1) HEPES buffered solution at pH 7.4. Sensor 2 exhibits selective colorimetric recognition of Cu(2+) and fluorogenic recognition of Hg(2+) with UV-vis and fluorescence spectroscopy, respectively. Moreover, both of the Cu(2+) and Hg(2+) recognition processes are proven to be hardly influenced by other coexisting metal ions. 相似文献
13.
14.
C Wu QN Bian BG Zhang X Cai SD Zhang H Zheng SY Yang YB Jiang 《Organic letters》2012,14(16):4198-4201
A new rhodamine spiro scaffold with a six-membered reactive ring was developed by inserting a nitrogen atom in the known probe rhodamine B spiro thiohydrazide, which switched the recognition preference of the probe from Hg(2+) to Cu(2+). This probe is shown to be an efficient "turn-on" fluorescent chemodosimeter for Cu(2+) in a neutral aqueous medium. Mechanism studies suggested that the probe opened its spiro-ring by a Cu(2+)-induced transformation of the cyclic thiosemicarbazide moiety to an isothiocyanate group. 相似文献
15.
基于罗丹明B酰肼和三苯胺染料合成了pH和Cu^2+双识别分子探针(RTPA),并利用核磁氢谱、核磁碳谱和高分辨质谱表征了RTPA的分子结构。通过紫外-可见光谱法和荧光光谱法研究了该荧光分子探针在极性不同的有机溶剂中的光谱性能以及在THF/H2O(V:V=1:1)溶液中对Cu^2+和质子的选择性识别性能。结果表明:随着溶剂的极性增大,化合物RTPA的最大发射波长发生红移,从419 nm红移到500 nm。该探针在水溶液中可以实现高选择性识别Cu^2+离子,不受其他常见金属离子的竞争性干扰。通过Job’s plot曲线证明了探针RTPA识别Cu^2+的化学计量比是1:1,Cu^2+的检出限为0.635μmol/L。当pH在1.87~4.48区间内,探针的荧光强度与pH呈良好的线性关系,线性相关系数为0.9957,其pKa为3.13。探针RTPA也可用于极酸性条件下(pH<4)质子浓度的定量检测。 相似文献
16.
Niels V. Heise Daniel Major Sophie Hoenke Marie Kozubek Immo Serbian Ren Csuk 《Molecules (Basel, Switzerland)》2022,27(7)
Pentacyclic triterpenoic acids (betulinic, oleanolic, ursolic, and platanic acid) were selected and subjected to acetylation followed by the formation of amides derived from either piperazine or homopiperazine. These amides were coupled with either rhodamine B or rhodamine 101. All of these compounds were screened for their cytotoxic activity in SRB assays. As a result, the cytotoxicity of the parent acids was low but increased slightly upon their acetylation while a significant increase in cytotoxicity was observed for piperazinyl and homopiperazinyl amides. A tremendous improvement in cytotoxicity was observed; however, for the rhodamine B and rhodamine 101 conjugates, and compound 27, an ursolic acid derived homopiperazinyl amide holding a rhodamine 101 residue showed an EC50 = 0.05 µM for A2780 ovarian cancer cells while being less cytotoxic for non-malignant fibroblasts. To date, the rhodamine 101 derivatives presented here are the first examples of triterpene derivatives holding a rhodamine residue different from rhodamine B. 相似文献
17.
分子光谱法具有灵敏度高、操作简单等优点,发展简便、快捷、对镍离子(Ni~(2+))具有高度选择性的探针具有非常重要的意义。本文以金属离子诱导罗丹明酰胺衍生物反应开环的策略,设计并合成了对Ni~(2+)检测具有单一选择性识别的紫外吸收探针。同时,该探针可对水溶液中的Ni~(2+)实现"裸眼"识别。此外,该探针对Ni~(2+)具有较高的灵敏度,其对水溶液中Ni~(2+)的检测限为0.5μmol/L,表明该探针可用于Ni~(2+)的检测分析。 相似文献
18.
19.
A rhodamine spirolactam/2-hydrazinopyridine derivative was synthesized and characterized, which exhibited high selectivity to Cu(2+) over other metal cations. The Cu(2+) recognition of this rhodamine derivative could be detected by fluorescence spectra, absorption spectra and an obvious color change which was observed easily by naked-eyes. The binding of this rhodamine derivative to Cu(2+) is instantaneous and sensitive. Moreover, a linear relationship was found between the fluorescence intensity at 575 nm from 0.5×10(-6) M to 3.0×10(-6) M of Cu(2+) concentration, and the limit of detection (LOD) was at low concentration of 2.11×10(-8) M, this would benefit for the establishment of standard working curves in practical Cu(2+) detection. Additionally, we synthesized rhodamine spirolactam/2-aminomethylpyridine derivative and rhodamine spirolactam/phenylhydrazine derivative as analogs for elucidate the structure-recognition relationships. Finally, we prepared the test strips of rhodamine spirolactam/2-hydrazinopyridine derivative for practical chromogenic the Cu(2+) detection. 相似文献
20.
《Arabian Journal of Chemistry》2022,15(4):103732
Recently, the research on the remediation of aqueous organic pollutants over visible-light-active photocatalysts has got much attention. Therefore, this study reports the fabrication of visible-light-active Co3O4-Bi2O3 heterojunction photocatalyst for the photodegradation of rhodamine B dye. The Co3O4-Bi2O3 heterojunction was synthesized by the coprecipitation method and characterized by XRD, EDS, SEM, TEM, TGA, and FTIR. The as-prepared Co3O4-Bi2O3 heterojunction was utilized as a photocatalyst for the abatement of rhodamine B dye. It was observed that Co3O4-Bi2O3 showed the best catalytic performance with ~92% degradation of rhodamine B dye than Co3O4 and Bi2O3 with 14 and 34% removal of rhodamine B dye, respectively. The rate constant for Co3O4-Bi2O3 catalyzed photodegradation of rhodamine B was 6 times and 3 times higher than the rate constant for Co3O4 catalyzed and Bi2O3 catalyzed photodegradation of rhodamine B, respectively. The as-prepared Co3O4-Bi2O3 exhibited the highest catalytic performance at pH 8. 相似文献