共查询到20条相似文献,搜索用时 31 毫秒
1.
Tárraga A Molina P López JL Velasco MD 《Dalton transactions (Cambridge, England : 2003)》2004,(8):1159-1165
The structure-redox chemistry relationship of a new type of azaferrocenophane-based chemosensors, 3 and 4, in the presence of protons and several kinds of metal ions, has been studied. Electrochemical studies, carried out in CH2Cl2, in the presence of increasing amounts of Mg2+, Ca2+, Zn2+ and Ni2+ showed that the wave corresponding to the Fc/Fc+ couple of the uncomplexed ligands is gradually replaced by a new reversible wave at more positive potentials corresponding to the Fc/Fc+ couple of the complexed ligands. The maximum shift of the ferrocene oxidation wave was found for 4b in the presence of Mg2+, whereas for 3f a selective sensing response for Mg2+ in the presence of hydrated Ca2+ cations was observed, with a concomitant highly visual output response consisting of a deep purple colour. 相似文献
2.
Dr. Carla Bazzicalupi Dr. Claudia Caltagirone Dr. Zenfeng Cao Dr. Qibin Chen Prof. Corrado Di Natale Dr. Alessandra Garau Prof. Dr. Vito Lippolis Dr. Larisa Lvova Dr. Honglai Liu Prof. Dr. Ingemar Lundström Dr. M. Cristina Mostallino Mattia Nieddu Prof. Roberto Paolesse Prof. Dr. Luca Prodi Massimo Sgarzi Dr. Nelsi Zaccheroni 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(43):14639-14653
Despite several types of fluorescent sensing molecules have been proposed and examined to signal Hg2+ ion binding, the development of fluorescence‐based devices for in‐field Hg2+ detection and screening in environmental and industrial samples is still a challenging task. Herein, we report the synthesis and characterization of three new coumarin‐based fluorescent chemosensors featuring mixed thia/aza macrocyclic framework as receptors units, that is, ligands L1 – L3 . These probes revealed an OFF–ON selective response to the presence of Hg2+ ions in MeCN/H2O 4:1 (v/v), which allowed imaging of this metal ion in Cos‐7 cells in vitro. Once included in silica core–polyethylene glycol (PEG) shell nanoparticles or supported on polyvinyl chloride (PVC)‐based polymeric membranes, ligands L1 – L3 can also selectively sense Hg2+ ions in pure water. In particular we have developed an optical sensing array tacking advantage of the fluorescent properties of ligand L3 and based on the computer screen photo assisted technique (CSPT). In the device ligand L3 is dispersed into PVC membranes and it quantitatively responds to Hg2+ ions in natural water samples. 相似文献
3.
Yicun Huang Fanyong Yan Manman Fu Ruiqi Zhang Xuguang Zhou Jinxia Xu 《Journal of the Iranian Chemical Society》2017,14(1):157-176
Because some metal ions are highly toxic even at trace level, a constant demand of developing methods for monitoring and removing these metal ions is extremely urgent. Silica-based optical chemosensors are supposed as good alternatives to classical instrumental methods for detecting and adsorbing metal ions, due to their effect and lower price. Silica nanoparticles, silica gel and mesoporous silica are used as supporting platforms to fabricate optical chemosensors. They have certain properties containing high porosity and expectant adsorption capacity. Chromogenic-type and fluorogenic-type optical probes, such as azobenzene, naphthalimide and rhodamine, are grafted to the surface of silica-based materials by sol–gel reaction, the limit of detection, response time and selective properties of optical sensors are improved sequentially. In this paper, the articles of silica-based optical chemosensors are retrospected since 2008, describing silica-based optical sensors used for sensing metal ions. The sensing mechanism, optical phenomenon, detection limit, adsorption capacity and application are also reviewed. 相似文献
4.
Rhodamine-based chemosensors 1 and 2 were synthesized and self-assembled onto glass surfaces for the selective fluorescent sensing of Pb2+. The immobilized chemosensors showed fluorescent responses that were turned-on with Pb2+ in CH3CN, selectively over various metal ions. The Pb2+-selective fluorescent switch of the immobilized chemosensors was also reversible, allowing for repeated use for Pb2+ detection. 相似文献
5.
Sutapa Sahu Yeasin Sikdar Riya Bag Javier Cerezo Jos P. Cern-Carrasco Sanchita Goswami 《Molecules (Basel, Switzerland)》2022,27(9)
Optical chemosensors caused a revolution in the field of sensing due to their high specificity, sensitivity, and fast detection features. Imidazole derivatives have offered promising features in the literature as they bear suitable donor/acceptor groups for the selective analytes in the skeleton. In this work, an isoindole-imidazole containing a Schiff base chemosensor (1-{3-[(2-Diethylamino-ethylimino)-methyl]-2-hydroxy-5-methyl-phenyl}-2H-imidazo[5,1-a]isoindole-3,5-dione) was designed and synthesized. The complete sensing phenomena have been investigated by means of UV-Vis, fluorescence, lifetime measurement, FT-IR, NMR and ESI-MS spectroscopic techniques. The optical properties of the synthesized ligand were investigated in 3:7 HEPES buffer:DMSO medium and found to be highly selective and sensitive toward Zn2+ ion through a fluorescence turn-on response with detection limit of 0.073 μm. Furthermore, this response is effective in gel form also. The competition studies reveal that the response of the probe for Zn2+ ion is unaffected by other relevant metal ions. The stoichiometric binding study was performed utilizing Job’s method which indicated a 1:1 sensor–Zn2+ ensemble. Computational calculations were performed to pinpoint the mechanism of sensing. 相似文献
6.
Fasil A. AbebeCarla Sue Eribal Guda RamakrishnaEkkehard Sinn 《Tetrahedron letters》2011,52(43):5554-5558
Two newly designed turn-on fluorescein-based chemosensors are highly sensitive and selective for Co2+ and Ni2+ in both absorption and emission modes, normally difficult to achieve with these paramagnetic ions. Binding to both ions is reversible, as indicated by the bleaching of the color when the metal is extracted with EDTA. Given the difficulty of designing enhanced fluorescent sensors for paramagnetic Co2+ and Ni2+ ions, the fluorescein compounds may inspire the further development of more sophisticated sensing constructs for the detection of these ions. 相似文献
7.
Rhodamine-based chemosensors 1 and 2 were synthesized and self-assembled onto glass surfaces for the selective fluorescent sensing of Pb(2+). The immobilized chemosensors showed fluorescent responses that were turned-on with Pb(2+) in CH(3)CN, selectively over various metal ions. The Pb(2+)-selective fluorescent switch of the immobilized chemosensors was also reversible, allowing for repeated use for Pb(2+) detection. 相似文献
8.
The coordination properties towards different metal ions of a new class of mixed N/S-, and N/S/O-donor macrocycles containing the 1,10-phenanthroline sub-unit in the cyclic framework are reviewed. The conformational constraints imposed by the heteroaromatic fragment onto the aliphatic portion of the ring determine the coordination mode of these ligands which can stabilise low-valent Ni+, Pd+, Pt+, and Rh+ metal complexes. Structural and thermodynamic aspects of the coordination chemistry of these ligands are considered together with possible applications as building blocks in the synthesis of multi-centred systems, and as template in the construction of extended polyiodide networks. However, solution studies demonstrate the inability of these ligands to work as selective and specific fluorescent chemosensors for heavy transition and post-transition metal ions and the formation constants evaluated for the formation of 1:1 complexes with Pb2+, Cd2+, Hg2+, Cu2+, and Ag+ in acetonitrile are of the same order of magnitude. Nevertheless, some of these macrocyles are extremely effective to recognise Cu2+ or Ag+ over the other metal ions in transport processes, and have been successfully used as neutral ionophore in the construction of PVC-based ionselective electrodes and supported liquid membranes for analytical detection and separation, respectively, of these metal ions. 相似文献
9.
The global sensing science in the past couple of years has seen brilliant successes in the designs and syntheses of diverse fluorescent and colourimetric chemosensors of ultra-high selectivities and sensitivities for the tracking of metal ions in environmental and biological systems. Amongst the most widely employed fluorophores for the development of fluorescent and colourimetric chemosensors is the 1, 8-naphthalimide fluorophore, which is distinctive due to its possession of outstanding photophysical properties unequalled by other fluorophores. Many reported literatures are replete with employment of 1, 8-naphthalimide as a unique fluorophore for the construction of chemosensors for the monitoring of metal ions (such as Cu2+, Hg2+, Cr3+, Fe3+, Zn2+, Ag+, Pd2+, Al3+, Ba2+, Au3+, and Bi2+, and/or a combination of any of them) with remarkable results documented from various labs. This review summarises recent advances in the development of representative fluorescent and colourimetric 1, 8-naphthalimide-based chemosensors reported within the past 7 years. It is believed that gaining insights into the various highlighted examples would help to refine our knowledge of the field and pave the way for further advancement in the constructions of fluorescent and colourimetric 1, 8-naphthalimide-based chemosensors of improved sensing parameters and practical application values. 相似文献
10.
Dr. Honglin Li Dr. Jiangli Fan Mingming Hu Guanghui Cheng Prof. Danhong Zhou Tong Wu Dr. Fengling Song Dr. Shiguo Sun Prof. Chunying Duan Prof. Xiaojun Peng 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(39):12242-12250
The well‐known rhodamine spiro‐lactam framework offers an ideal model for the development of fluorescence‐enhanced chemosensors through simple and convenient syntheses. Herein, we report a new tridentate PNO receptor, which was introduced into a rhodamine spiro‐lactam system to develop Pd2+‐chemosensor RPd4 , that displayed significantly improved sensing properties for palladium. Compound RPd4 shows a very fast response time (about 5 s), high sensitivity (5 nM ), and excellent specificity for Pd2+ ions over other PGE ions (Pt2+, Rh3+, and Ru3+). In addition, RPd4 displays quite different responses to different valence states of the Pd ions, that is, very fast response towards Pd2+ ions but slow response towards Pd0, which may provide us with a convenient method for the selective discrimination of Pd species in different valence states. According to proof‐of‐concept experiments, RPd4 has potential applications in Pd2+‐analysis in drug compounds, water, soil, and leaf samples. Owing to its good reversibility, RPd4 can also be used as a sensor material for the selective detection and visual recovery of trace Pd2+ ions in environmental samples. 相似文献
11.
dm Golcs Korinna Kovcs Panna Vezse Tünde Tth Pter Huszthy 《Molecules (Basel, Switzerland)》2021,26(13)
Acridino-diaza-20-crown-6 ether derivatives as new turn-on type fluorescent chemosensors with an excellent functionality and photophysical properties have been designed and synthesized for metal ion-selective optochemical sensing applications. Spectroscopic studies revealed that in an acetonitrile-based semi-aqueous medium, the sensor molecules exhibited a remarkable fluorescence enhancement with high sensitivity only toward Zn2+, Al3+ and Bi3+, among 23 different metal ions. Studies on complexation showed a great coordinating ability of logK > 4.7 with a 1:1 complex stoichiometry in each case. The detection limits were found to be from 59 nM to micromoles. The new ionophores enabled an optical response without being affected either by the pH in the range of 5.5–7.5, or the presence of various anions or competing metal ions. Varying the N-substituents of the new host-backbone provides diverse opportunities in both immobilization and practical applications without influencing the molecular recognition abilities. 相似文献
12.
Carla Queirs Vítor A. S. Almodvar Fbio Martins Andreia Leite Augusto C. Tom Ana M. G. Silva 《Molecules (Basel, Switzerland)》2022,27(21)
The search for accurate and sensitive methods to detect chemical substances, namely cations and anions, is urgent and widely sought due to the enormous impact that some of these chemical species have on human health and on the environment. Here, we present a new platform for the efficient sensing of Cu2+ and Li+ cations. For this purpose, two novel photoactive diketopyrrolopyrrole-rhodamine conjugates were synthesized through the condensation of a diketopyrrolopyrrole dicarbaldehyde with rhodamine B hydrazide. The resulting chemosensors 1 and 2, bearing one or two rhodamine hydrazide moieties, respectively, were characterized by 1H and 13C NMR and high-resolution mass spectrometry, and their photophysical and ion-responsive behaviours were investigated via absorption and fluorescence measurements. Chemosensors 1 and 2 displayed a rapid colorimetric response upon the addition of Cu2+, with a remarkable increase in the absorbance and fluorescence intensities. The addition of other metal ions caused no significant effects. Moreover, the resulting chemosensor-Cu2+ complexes revealed to be good probes for the sensing of Li+ with reversibility and low detection limits. The recognition ability of the new chemosensors was investigated by absorption and fluorescence titrations and competitive studies. 相似文献
13.
Balasubramanian Mariammal Adaikalam Shylaja Sundaravel Vivek Kumar Stephen Raja Rubina Raju Ranjith Kumar 《Journal of heterocyclic chemistry》2020,57(11):3882-3889
3-Amino-5-(thiazol-2-yl)-[1,1′-biaryl]-2,4-dicarbonitriles have been synthesized employing a facile one-pot pseudo four-component domino strategy. All these thiazole-tethered biaryls exhibited blue fluorescence under UV lamp. Based on the high relative quantum yield, three compounds namely, 4a , 4d , and 4i , were chosen to explore the metal interference studies. Against several metal ions, these three thiazole-tethered biphenyl probes were found to be effective fluorescent chemosensors for the selective and sensitive detection of Fe3+ ions with a lower detection limit of 0.18, 0.12, and 0.16 μM, respectively. 相似文献
14.
Lik Hang Yuen Dr. Raphael M. Franzini Dr. Shenliang Wang Dr. Pete Crisalli Dr. Vijay Singh Dr. Wei Jiang Prof. Dr. Eric T. Kool 《Angewandte Chemie (International ed. in English)》2014,53(21):5361-5365
Heavy metal contamination of water can be toxic to humans and wildlife; thus the development of methods to detect this contamination is of high importance. Here we describe the design and application of DNA‐based fluorescent chemosensors on microbeads to differentiate eight toxic metal ions in water. We developed and synthesized four fluorescent 2′‐deoxyribosides of metal‐binding ligands. A tetramer‐length oligodeoxy‐fluoroside (ODF) library of 6561 members was constructed and screened for sequences responsive to metal ions, of which seven sequences were selected. Statistical analysis of the response patterns showed successful differentiation of the analytes at concentrations as low as 100 nM . Sensors were able to classify water samples from 13 varied sites and quantify metal contamination in unknown specimens. The results demonstrate the practical potential of bead‐based ODF chemosensors to analyze heavy metal contamination in water samples by a simple and inexpensive optical method. 相似文献
15.
Optical supermicrosensor responses for simple recognition and sensitive removal of Cu (II) Ion target 总被引:1,自引:0,他引:1
The field of optical chemosensor technology demands a simple yet general design for fast, sensitive, selective, inexpensive, and specific recognition of a broad range of toxic metal ions. The suitable accommodation of chromogenic receptors onto ordered porous carriers have led to selective and sensitive chemosensors of target species. In this study, we offer real evidence on the potential use of two- and three-dimensional (2D and 3D) ordered supermicroporous monoliths as selective shape and size carriers for immobilizing the chromogenic probe. Among all the chemosensors, 3D supermicropore has exhibited easy accessibility of target ions, such as ion transports and high affinity responses of receptor-metal analyte binding events. This leads to an optical color signal that is easily generated and transduced even at trace levels of Cu(II) target ions. The supermicrosensors have shown the ability to create Cu(II) ion-sensing responses up to nanomolar concentrations (∼10−9 mol/dm3) with rapid response time (in the order of seconds). Supermicrosensors have the ability to create easily modified sensing systems with multiple regeneration/reuse cycles of sensing systems of Cu(II) analytes. The simple treatment using ClO4− anion as a stripping agent has removed effectively the Cu(II) ions and formed a “metal-free” probe surface. The supermicrosensors have exhibited the specificity behavior permitting Cu(II) ion-selective determination in real-life samples, such as in wastewater, despite the presence of active component species. Extensive analytical results indicate that the use of the supermicrosensor as Cu(II) ion strips for field screening can be a time- and cost-alternative tool to current effective laboratory assays. 相似文献
16.
Guo‐Ping Xue Paul B. Savage Krzysztof E. Krakowiak Reed M. Izatt Jerald S. Bradshaw 《Journal of heterocyclic chemistry》2001,38(6):1453-1457
Six new diazadibenzo‐18‐crown‐6 ligands substituted with two each of 8‐hydroxyquinoline (7), 8‐amino‐quinoline (attached through its C‐2 or C‐7 position) ( 12 and 13 ), 8‐methoxyquinoline ( 18 ), 5‐chloro‐8‐methoxyquinoline ( 19 ), and dansylamidoethyl ( 21 ) side arms were synthesized as potential metal ion chemosensors and potential reagents for the selective extraction of certain metal ions from aqueous solutions. Ligands 7, 12, 13, 18 , and 19 were synthesized by reductive amination of diazadibenzo‐18‐crown‐6 ( 5 ) and the appropriate quinolinecarboxaldehydes. Bis(dansylamidoethyl)‐substituted ligand 21 was synthesized by treating diazacrown ether 5 with N‐dansylaziridine ( 20 ). 相似文献
17.
A series of fluorescent chemosensors 1-3 were synthesized to detect transition metal ions. At the room temperature, fluorescence intensities of these chemosensors in acetonitrile without transition metal ions were found to be very weak, due to the process of the e±cient intramolecular photoinduced electron transfer (PET). However, after addition of the transition metal ions, the chemosensor 1-3 exhibits obvious fluorescence enhancement. Moreover, the intensity of the fluorescence emission of chemosensors increases significantly in the presence of Zn2+ and Cd2+. The fluorescent chemosensors with different polyamine as receptors show diverse a±nity abilities to the transition metal ions and signal the receptor-metal ion interaction by the intensity change of fluorescence emission. 相似文献
18.
Caballero A Martínez R Lloveras V Ratera I Vidal-Gancedo J Wurst K Tárraga A Molina P Veciana J 《Journal of the American Chemical Society》2005,127(45):15666-15667
Two new chemosensors that exhibit high affinity and high selectivity for Hg2+ in aqueous environment which operate through two different channels, optic/redox and optic/fluorescent, are reported. The optical change in sensing can be used even for a "naked-eye" detection of Hg2+ ions, whereas the fluorescent response can be modulated by varying the solvent polarity. 相似文献
19.
Caballero A Lloveras V Curiel D Tárraga A Espinosa A García R Vidal-Gancedo J Rovira C Wurst K Molina P Veciana J 《Inorganic chemistry》2007,46(3):825-838
The synthesis, optical and electrochemical properties, and X-ray characterization of two thiazole derivatives capped by ferrocenyl groups (5 and 7) and their model compounds with one ferrocenyl, either at 2 or 5 position of the mono- or bis-thiazolyl rings (3, 9, 11, and 14), are presented. Bisferrocenyl thiazole 5 forms the mixed-valence species 5*+ by partial oxidation which, interestingly, shows an intramolecular electron-transfer phenomenon. Moreover, the reported heteroaromatic compounds show selective ion-sensing properties. Thus, ferrocenylthiazoles linked across the 5 position of the heteroaromatic ring are selective chemosensors for Hg2+ and Pb2+ metal ions; 5-ferrocenylthiazole 3 operates through two channels, optical and redox, for Hg2+ and only optical for Pb2+, whereas 1,1'-bis(thiazolyl)ferrocene 14 is only an optical sensor for both metal ions. Moreover, complex 3 behaves as an electrochemically induced switchable chemosensor because of the low metal-ion affinity of the oxidized 3*+ species. On the other hand, ferrocenylthiazole 9, in which the heterocyclic ring and the ferrocene group are linked across the 2 position, is a selective redox sensor for Hg2+ metal ions, and it responds optically, as does bis(thiazolyl)ferrocene 11, to a narrow range of cations (Zn2+, Cd2+, Hg2+, Ni2+, and Pb2+). Finally, bis(ferrocenyl)thiazole 5 is a dual optical and redox sensor for Zn2+, Cd2+, Hg2+, Ni2+, and Pb2+, whereas bis(ferrocenyl) compound 7, bearing a bis(thiazole) unit as a bridge, is only a chromogenic sensor for Zn2+, Cd2+, Hg2+, Ni2+, and Pb2+. The experimental data and conclusions about both the electronic and ion-sensing properties are supported by DFT calculations which show, in addition, an unprecedented intramolecular electron-transfer reorganization after the first one-electron oxidation of compound 5. 相似文献
20.
Yoon Ju Lee Dongwon Seo Ji Young Kwon Guiyoup Son Min Sun Park Yun-Hee Choi Jung Hyun Soh Ha Na Lee Kap Duk Lee Juyoung Yoon 《Tetrahedron》2006,62(52):12340-12344
Two new selenium containing anthracene derivatives and two new sulfur containing anthracene derivatives were synthesized as fluorescent chemosensors for Hg2+ and Cu2+. Compound 1 displayed a highly selective chelation enhanced fluorescence quenching (CHEQ) effect only with Cu2+, on the other hand, compounds 3 and 4 displayed highly selective chelation enhanced fluorescence (CHEF) effects only with Hg2+ among the metal ions examined. 相似文献