Relevant bibliographies by topics / Chemosensors

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Chemosensors'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Chemosensors"

1

Ying, Liang, and Yu Chun-Wei. "A Chemosensor for Fe3+ Detection Derived from Pyrene." Academic Journal of Chemistry, no. 73 (August 20, 2022): 42–46. http://dx.doi.org/10.32861/ajc.73.42.46.

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It is of great significance to find a suitable method to detect Fe3+ due to its essential role in human and animal health. Artificial chemosensors have been a suitable method in view of simple preparation, fast response, et al. [Aim]: A selective Fe3+ chemosensor was designed. [Method]: A novel Fe3+-selective chemosensor was rationally designed based on pyrene derivative by the introduction of benzoyl hydrazine. [Results] The proposed chemosensor presented good selectivity for Fe3+ in presence of other common metal ions. [Conclusions]: The proposed idea can be used for reference to enrich chemosensors.
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Ikeda, Hiroshi. "Diversely Responsive Turn-On Fluorescent Cyclodextrin Chemosensors: Guest Selectivities and Mechanism Insights." Chemosensors 8, no. 3 (July 1, 2020): 48. http://dx.doi.org/10.3390/chemosensors8030048.

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Chemosensors have attracted considerable attention among the numerous strategies for detecting organic molecules in water. A turn-off mechanism was previously employed for the construction of a cyclodextrin (CD) chemosensor. This mechanism is greatly effective but has several shortcomings. In order to overcome these shortcomings, new fluorescent chemosensors NC0αCD, NC0βCD, and NC0γCD, which were (7-nitrobenz-2-oxa-1,3-diazol-4-yl)amine-modified α-CD, β-CD, and γ-CD, respectively, were prepared. Their guest selectivities were different from those of previously reported CD chemosensors. Here, the mechanism of new CD chemosensors was investigated using nuclear magnetic resonance (NMR) spectroscopy and molecular mechanics calculations. The fluorescence intensity of NC0βCD and NC0γCD slightly decreased and largely increased, respectively, upon the addition of ursodeoxycholic acid as a guest. This is due to the fact that the fluorophore of NC0βCD moved away to the hydrophilic bulk water to form hydrogen bonds between the host and the guest, while the fluorophore of NC0γCD remained located at the primary hydroxy side of the γ-CD unit to form a stable inclusion complex with hydrogen bonds between the fluorophore and the guest. NC0αCD also acted as a turn-on chemosensor for small guests, which could not be detected by the previous CD chemosensors. The motion restriction of the fluorophore through the generation of inclusion complexes could also contribute to increase in fluorescence intensity.
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Goyal, Hina, Ibrahim Annan, Deepali Ahluwalia, Arijit Bag, and Rajeev Gupta. "Discriminative ‘Turn-on’ Detection of Al3+ and Ga3+ Ions as Well as Aspartic Acid by Two Fluorescent Chemosensors." Sensors 23, no. 4 (February 6, 2023): 1798. http://dx.doi.org/10.3390/s23041798.

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In this work, two Schiff-base-based chemosensors L1 and L2 containing electron-rich quinoline and anthracene rings were designed. L1 is AIEE active in a MeOH-H2O solvent system while formed aggregates as confirmed by the DLS measurements and fluorescence lifetime studies. The chemosensor L1 was used for the sensitive, selective, and reversible ‘turn-on’ detection of Al3+ and Ga3+ ions as well as Aspartic Acid (Asp). Chemosensor L2, an isomer of L1, was able to selectively detect Ga3+ ion even in the presence of Al3+ ions and thus was able to discriminate between the two ions. The binding mode of chemosensors with analytes was substantiated through a combination of 1H NMR spectra, mass spectra, and DFT studies. The ‘turn-on’ nature of fluorescence sensing by the two chemosensors enabled the development of colorimetric detection, filter-paper-based test strips, and polystyrene film-based detection techniques.
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Mao, Hua, John B. Thorne, Jennifer S. Pharr, and Robert E. Gawley. "Effect of crown ether ring size on binding and fluorescence response to saxitoxin in anthracylmethyl monoazacrown ether chemosensors." Canadian Journal of Chemistry 84, no. 10 (October 1, 2006): 1273–79. http://dx.doi.org/10.1139/v06-093.

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Convenient macrocyclization synthetic routes for the preparation of different-sized monoaza anthracylmethyl crown ether chemosensors (15-crown-5, 18-crown-6, 21-crown-7, 24-crown-8, and 27-crown-9) are described. Evaluation of these crowns as chemosensors for saxitoxin revealed that the larger crowns have moderately higher binding constants, with the 27-crown-9 chemosensor having the largest binding constant (2.29 × 105 (mol/L)–1). Fluorescence enhancements of 100% were observed at saxitoxin concentrations of 5 µmol/L, which is close to the detection limit in mouse bioassay.Key words: anthracene, crown ethers, saxitoxin, paralytic shellfish poison (PSP), binding constants; chemosensors.
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Koralli, Panagiota, and Dionysios E. Mouzakis. "Advances in Wearable Chemosensors." Chemosensors 9, no. 5 (April 29, 2021): 99. http://dx.doi.org/10.3390/chemosensors9050099.

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In this review, the latest research on wearable chemosensors is presented. In focus are the results from open literature, mainly from the last three years. The progress in wearable chemosensors is presented with attention drawn to the measuring technologies, their ability to provide robust data, the manufacturing techniques, as well their autonomy and ability to produce power. However, from statistical studies, the issue of patients’ trust in these technologies has arisen. People do not trust their personal data be transferred, stored, and processed through the vastness of the internet, which allows for timely diagnosis and treatment. The issue of power consumption and autonomy of chemosensor-integrated devices is also studied and the most recent solutions to this problem thoroughly presented.
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Ghazalli, Nur Fatiha Nur, Nurul Husna Sabran, Juan Matmin, Mohamad Azani Jalani, and Hendrik Oktendy Lintang. "Phosphorescent Vapochromic Responses of Copper(I) Complex Bearing Pyrazole Ligands for Detection of Alcohol Derivatives." Malaysian Journal of Fundamental and Applied Sciences 18, no. 1 (February 28, 2022): 138–47. http://dx.doi.org/10.11113/mjfas.v18n1.2560.

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The methodical study of trinuclear copper(I) metal complexes phosphorescent vapochromic chemosensor via metal-metal interactions for sensing various volatile organic compounds has piqued the interest of many researchers. Herein, we highlighted the performance of chemosensors trinuclear copper(I) pyrazolate complexes (2Pz1‒2Pz5) with different molecular design short alkyl side chains from the respective pyrazole ligands. The synthesized complexes had demonstrated a high phosphorescent sensing capacity of various alcohol derivatives. Due to weak metal-metal interactions, the complexes give emission bands centered around 553-644 nm at an excitation of 280 nm. We found that the only 2Pz3 chemosensors showed quenching phenomena with a significant decrease in its emission intensity of 100% for exposure in 5 minutes with irreversible performance. Interestingly, we also found that the shifting of the emission center due to the disruption of metal-metal interaction performed by chemosensor 2Pz5 resulting in the best detection performance of methanol and ethanol (∆λ= 60 nm) and propanol (∆λ = 22 nm) showing autonomous recovery within 15 minutes. Based on the findings, the specific balance, such as rigidity and amphiphilicity in the molecular design of chemosensors, is important for the detection of vapors via supramolecular interactions.
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Sousa, Rui P. C. L., Raquel C. R. Gonçalves, Susana P. G. Costa, Rita B. Figueira, and Maria Manuela M. Raposo. "Heterocyclic Aldehydes Based on Thieno[3,2-b]thiophene Core: Synthesis and Preliminary Studies as Ion Optical Chemosensors." Cells 3, no. 1 (November 13, 2020): 88. http://dx.doi.org/10.3390/ecsoc-24-08092.

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Heterocyclic aldehydes show a variety of optical properties and the versatility of their reactivity allows them to yield a wide range of more complex compounds, with application in areas such as medicinal, materials and supramolecular chemistry. The biological and environmental relevance of certain molecules and ions turns them into targets for the design of molecular recognition systems. Recently, heterocyclic aldehydes have been reported in the literature as ion chemosensors. Following the group’s work on optical chemosensors, for the detection and quantification of ions and molecules with environmental and medicinal relevance, this work reports the synthesis and characterization of two heterocyclic aldehydes based on the thieno[3,2-b]thiophene core, by Suzuki coupling, as well as the synthesis of the corresponding precursors. Preliminary chemosensory studies for the synthesized heterocyclic aldehydes in the presence of selected cations were also performed, in solution, in order to determine their potential application as optical chemosensors.
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Verdejo, Begoña, Mario Inclán, María Paz Clares, Irene Bonastre-Sabater, Mireia Ruiz-Gasent, and Enrique García-España. "Fluorescent Chemosensors Based on Polyamine Ligands: A Review." Chemosensors 10, no. 1 (December 22, 2021): 1. http://dx.doi.org/10.3390/chemosensors10010001.

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Polyamine ligands are water-soluble receptors that are able to coordinate, depending on their protonation degree, either metal ions, anionic, or neutral species. Furthermore, the presence of fluorescent signaling units allows an immediate visual response/signal. For these reasons, they can find applications in a wide variety of fields, mainly those where aqueous media is necessary, such as biological studies, wastewater analysis, soil contamination, etc. This review provides an overview of the recent developments in the research of chemosensors based on polyamine ligands functionalized with fluorescent signaling units. The discussion focuses on the design, synthesis, and physicochemical properties of this type of fluorescent chemosensors in order to analyze the applications associated to the sensing of metal ions, anions, and neutral molecules of environmental and/or biological interest. To facilitate a quick access and overview of all the chemosensors covered in this review, a summary table of the chemosensor structures and analytes, with all the corresponding references, is also presented.
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Martins, Cátia D. F., Patrícia M. R. Batista, M. Manuela M. Raposo, and Susana P. G. Costa. "Crown Ether Benzoxazolyl-Alanines as Fluorimetric Chemosensors for the Detection of Palladium in Aqueous Environment." Chemistry Proceedings 3, no. 1 (November 14, 2020): 5. http://dx.doi.org/10.3390/ecsoc-24-08310.

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Palladium has wide application in different contexts and, as a consequence, high levels of palladium in the environment have been reported, representing a risk to human health. Considering the interest to develop more selective and sensitive chemosensors for this analyte, two novel benzoxazolyl-alanine derivatives bearing a crown ether moiety were studied as potential fluorimetric chemosensors for palladium detection. Preliminary chemosensory studies for these unnatural amino acids in the presence of selected metal cations were performed in acetonitrile solution and in aqueous mixtures of sodium dodecyl sulfate (SDS, 20 mM, pH 7.5) solution with acetonitrile, 90:10 v/v. In acetonitrile solution, these probes had a fluorescence response for different cations but, most importantly, in SDS aqueous solution both compounds displayed a selective fluorescence response in the presence of palladium.
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Queirós, Carla, Vítor A. S. Almodôvar, Fábio Martins, Andreia Leite, Augusto C. Tomé, and Ana M. G. Silva. "Synthesis of Novel Diketopyrrolopyrrole-Rhodamine Conjugates and Their Ability for Sensing Cu2+ and Li+." Molecules 27, no. 21 (October 25, 2022): 7219. http://dx.doi.org/10.3390/molecules27217219.

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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.
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Dissertations / Theses on the topic "Chemosensors"

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Dujols, Virginie Elisabeth. "Rhodamine & anthracene-based chemosensors /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487941504294111.

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Cabell, Larry Allen. "Chemosensors and competition sensing assays /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Fang, Albert Geeson. "Development of novel fluorescent chemosensors /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3138822.

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Jin, Shan. "Development of Boronic Acid-Based Chemosensors." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/chemistry_diss/31.

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It is well known that boronic acids can bind with diols and can be further applied as chemosensors for biomolecules such as carbohydrates and dopamine. Carbohydrates are known to mediate a large number of biological and pathological events. Small and macromolecules capable of carbohydrate recognition have great potentials as research tools, diagnostics, vectors for targeted delivery of therapeutic and imaging agents, and therapeutic agents.
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Santos, Carla Isabel Madeira dos. "Corroles : synthesis, functionalization and application as chemosensors." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/11959.

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Departamento em Química
O trabalho de investigação apresentado nesta dissertação foi desenvolvido tendo como objectivo a síntese e funcionalização de meso-triarilcorróis para utilização como quimiossensores. Este trabalho encontra-se apresentado ao longo de cinco capítulos. No primeiro capítulo são apresentadas as características gerais, as metodologias de síntese e de funcionalização de macrociclos de tipo corrólico, e descrevemse algumas aplicações em que têm sido utilizados. São ainda abordadas algumas das propriedades e características dos quimiossensores e os mecanismos de deteção de diversos analítos. No segundo capítulo, após uma pequena introdução às reações de Wittig e de Diels-Alder, escolhidas para a funcionalização do macrociclo corrólico, descreve-se o estudo efectuado para a obtenção do complexo de gálio(III) do 3- vinil-5,10,15-tris(pentafluorofenil)corrol e o seu comportamento como dieno, em reações de Diels-Alder na presença dos dienófilos 1,4-benzoquinona e 1,4- naftoquinona. Desses estudos resultaram dois aductos cuja habilidade sensorial, bem como a dos seus precursores, foi estudada, em solução, na presença de aniões esféricos (F-, Br-, Cl-), lineares (CN-) e volumosos (CH3COO-, H2PO4 -). Dos macrociclos estudados verificou-se que o corrol base-livre 5,10,15-tris(pentafluorofenil)corrol apresenta uma elevada sensibilidade para o anião fluoreto (F-), e que a coordenação do núcleo corrólico com gálio(III) diminui a afinidade para este anião. Em geral, todos os compostos mostraram afinidade para o anião cianeto (CN-) mesmo quando em suportes poliméricos. O gel de poliacrilamida revelou-se muito promissor na determinação de CN- em amostras de água. No terceiro capítulo é avaliada a reatividade do complexo de gálio(III) do 3- vinil-5,10,15-tris(pentafluorofenil)corrol ainda como dieno mas agora na presença de um dienófilo linear, o acetilenodicarboxilato de dimetilo. Desse estudo resultaram dois novos derivados corrólicos. A habilidade sensorial dos mesmos perante os aniões fluoreto, cianeto, acetato, e fosfato foi avaliada por espectroscopia de absorção e emissão tendo um dos aductos mostrado ser colorimétrico para o anião cianeto. No quarto capítulo descreve-se a síntese e caracterização de dois conjugados do tipo corrol-cumarina, resultantes de reações de Hetero-Diels-Alder entre o 3-vinil-5,10,15-tris(pentafluorofenil)corrolatogálio(III)(piridina) e orto-quinonasmetídeos gerados in situ a partir de reacções de Knoevenagel entre cumarinas e paraformaldeído. Realizaram-se estudos de afinidade sensorial para aniões e catiões com estes macrociclos, bem como com conjugados porfirinacumarina análogos. A inserção de uma unidade cumarina conferiu uma excepcional solubilidade tendo os novos derivados apresentado solubilidade em etanol. No quinto e último capítulo desta dissertação é avaliada a capacidade sensorial do 5,10,15-tris(pentafluorofenil)corrol e da sua espécie monoaniónica, para os catiões metálicos Na+, Ca2+, Cu2+, Cd2+, Pb2+, Hg2+, Ag+, Al3+, Zn2+, Ni2+, Cr3+, Ga3+, Fe3+ em tolueno e acetonitrilo. Os macrociclos corrólicos mostraram ser selectivos e colorimétricos para o catião Hg2+. Neste trabalho descreve-se ainda a síntese do derivado -iminocorrol, que após funcionalização com o 3-isocianatopropiltrimetoxisilano originou um derivado do tipo alcoxisilano, que foi, posteriormente, ancorado a nanopartículas comerciais de sílica. As novas nanopartículas ancoradas com o alcoxisilano corrol foram estudadas na presença de Cu2+, Hg2+ e Ag+. Na presença do catião Ag+ assistiu-se a uma mudança de cor, de verde para amarelo.
The work described in this dissertation was focused on the synthesis of mesotriarylcorroles and their functionalization for later use as chemosensors. This work is divided in five chapters. In the first chapter it is described the general features of corroles, synthetic methodologies, the functionalization procedures and the applications of this kind of macrocycles. Additionally, some considerations about chemosensors and the importance of analytes that will be evaluated is also discussed. In the second chapter the Wittig and Diels- Alder reactions were chosen as post-functionalization procedures to apply to corroles. In this way, by the use of a Wittig reaction, the derivative 3–vinil-5,10,15- tris(pentafluorophenyl)corrolatogallium(III) was synthetized, from the corresponding 3-formy-5,10,15-tris(pentafluorophenyl)corrolatogallium(III), and its behavior as diene in Diels–Alder reactions, in the presence of the dienophiles 1,4-benzoquinone and 1,4-naphthoquinone was evaluated. These studies afforded two Diels-Alder adducts whose sensorial ability, as well as of their precursors, was studied in solution in the presence of spherical( F -, Br -, Cl -), linear (CN-) and bulky (CH3COO-, H2PO4 -) anions. The 5,10,15- tris(pentafluorophenyl)corrole showed to be the most sensitive macrocycle to the fluoride anion (F-). Although all derivatives have interacted with this anion the coordination of the corrole core with gallium(III) decreased their affinity for this anion. In general, all compounds showed interaction with cyanide (CN-) anions. By these results two low cost polymers based on polymethylmethacrylate and polyacrylamide were prepared and used in the detection of CN- in water. The polyacrylamide gel proved to be very promising. In the third chapter the reactivity of the gallium(III) (pyridine) complex of 3-vinyl- 5,10,15-tris(pentafluorophenyl)corrole as a diene was extended to dimethyl acetylenedicarboxylate as dienophile. This study afforded two new corrole derivatives. The sensorial ability of the new macrocycles towards fluoride, cyanide, acetate and phosphate anions was carried out by absorption and emission spectroscopy. One of the derivatives showed to be colorimetric to cyanide, where a change of colour from green to colourless was visualized. In the fourth chapter is described the synthesis and characterization of two new derivatives resulting from hetero-Diels-Alder reactions between the gallium(III) (pyridine) complex of 3-vinyl-5,10,15-tris(pentafluorophenyl)corrole and oquinone methides (o-QM) generated in situ from Knoevenagel reactions of coumarins with paraformaldehyde. The sensing ability of the resulting compounds was studied in the presence of different anions and cations. These sensorial studies were extended to porphyrin-coumarin analogues. The insertion of a coumarin moiety conferred an unusual solubility to these conjugates in ethanol. In the last chapter is shown the sensorial ability of 5,10,15- tris(pentafluorophenyl)corrole and of its monoanionic species towards Na+, Ca2+, Cu2+, Cd2+, Pb2+, Hg2+, Ag+, Al3+, Zn2+, Ni2+, Cr3+, Ga3+, Fe3+ metal ions in toluene and acetonitrile. The photophysical studies towards metal ions were carried out by absorption and emission spectroscopy. These corroles showed to be selective and colorimetric for Hg2+. In addition a new - imine corrole was successful synthetized and further functionalized with 3-isocyanatopropyltrimethoxysilane resulting an alkoxysilane derivative. The grafting of alkoxysilane derivative, with optically transparent silica nanoparticles (SiNPs) was also performed. The new-coated silica nanoparticles with corrole were studied in the presence of Cu2+, Hg2+ and Ag+ as metal ion probes. In the presence of Ag+ was observed a change of colour from green to yellow.
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Cheung, Sin Man. "Development of optical chemosensors for cation sensing." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/771.

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Rosa-Gastaldo, Daniele. "Supramolecular chemosensors for the detection of phenethylamines." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3425410.

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In this work I described and discussed the results of a research project which focused on both development and application of the NMR-chemosensing technique. This technique is based on the combination of gold nanoparticles 2 nm in diameter coated with specific thiols and particular NMR experiments, and it allows to “extract” from the NMR spectrum of a mixture of substances the single NMR spectrum of the analyte bound by the nanoparticle. Specifically, the main goal of my work was to demonstrate how this technique can be successfully used for designer-drug detection. The majority of the new drugs that appear on the market every year belong to this category, i.e. they are structural analogs of already well-known drugs. Designer drugs represent a big health issue, because no studies on them are available, therefore the risks and potential long-term adverse effects are not known. Moreover, as reference standards are not available, their sensing with routine techniques is difficult. The technique that I will describe also works on real street samples, with no pretreatment, thus giving the possibility to get from the seizure of the powder to the characterization of the substance in a few hours. I’ll also show that to improve the potentialities of NMR chemosensing in terms of detection limit and sensitivity one can work from two sides. First, it is possible to improve the design of the coating thiol, obtaining a monolayer with different affinities and different capability of magnetization transfer, both crucial aspects for the technique. On the other hand, it is possible to im-prove sensitivity by acting directly on the type of NMR experiment used as well, also in combination with tricks that exploit magnetization enhancement, such as using the water trapped in the monolayer as an additional magnetization source or using the capability of gold nanoparticles to self-assemble on silica nanospheres, in order to enhance the nanoreceptor’s size. Combining all the various things, I will demonstrate how it is possible to sense inorganic species too, such as K+, which do not have an NMR signal per se. Finally, as NMR is not, as of now, a technique that is easy to apply for on-field analysis, in the last part of this paper I propose a point-of-care sensor developed in the form of an indicator strip in which a self-assembled supramolecular receptor composed of a cucurbituril and a dye can selectively sense the presence, or not, of a drug in a quick, safe and cheap way.
In questa tesi ho descritto e discusso i risultati ottenuti nell’ambito di un progetto di ricerca focalizzato sull’applicazione e lo sviluppo della tecnica dell’NMR-chemosensing. Questa tecnica è basata sulla combinazione di nanoparticelle d’oro da 2 nm di diametro passivate con opportuni tioli e di particolari esperimenti NMR e consente di “estrarre” dallo spettro NMR di una miscela di composti lo spettro NMR dell’analita riconosciuto dalla nanoparticella. In particolare, lo scopo primario del mio lavoro è stato dimostrare come questa tecnica possa essere usata con successo per il rilevamento delle cosiddette “designer drugs”. La maggior parte delle nuove droghe immesse sul mercato ogni anno altro non sono che analoghi strutturali di droghe già diffuse. Ciò rappresenta un grave problema di salute pubblica, perché non essendo queste nuove sostanze mai state studiate, non se ne conoscono i potenziali rischi e gli effetti a lungo termine. In più, non esistendo standard di riferimento, la loro rilevazione con tecniche tradizionali risulta difficoltosa. La tecnica che verrà descritta è stata testata e funziona anche su campioni reali, senza bisogno di pretrattamento del campione, e dà la possibilità di arrivare dal sequestro alla caratterizzazione strutturale della sostanza stupefacente nel giro di poche ore. Dimostrerò anche che per migliorare le potenzialità dell’NMR-chemosensing in termini sia di sensibilità che versatilità si può agire su un doppio fronte. Da un lato, è possibile migliorare la struttura del tiolo che ricopre le nanoparticelle, ottenendo un monostrato con maggior affinità e maggior capacità di trasferimento della magnetizzazione, entrambi aspetti fondamentali della tecnica. Dall’altro, è possibile migliorare la sensibilità agendo direttamente sul tipo di esperimento utilizzato, anche in abbinamento ad astuzie che possano aumentare l’efficienza del trasferimento di magnetizzazione, quali ad esempio usare l’acqua intrappolata nel monostrato come fonte supplementare di magnetizzazione oppure sfruttare la capacità delle nanoparticelle d’oro di autoassemblarsi su nanosfere di silice per aumentare le dimensioni del nanorecettore. Combinando tutte queste accortezze, dimostrerò come sia possibile analizzare con questa tecnica anche specie inorganiche, come K+, che di per sé non possiedono alcun segnale NMR. Infine, visto che l’NMR non è, per ora, una tecnica di facile applicazione per analisi sul campo, nell’ultima parte di questo lavoro di tesi mi sono occupato anche un sensore point-of-care sviluppato sotto forma di cartina indicatrice, in cui un recettore supramolecolare autoassemblato composto da un cucurbiturile e un colorante può indicare selettivamente la presenza o meno di sostanza stupefacenti in modo rapido, sicuro ed economico.
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Kuntner, Jochen [Verfasser]. "Oil Condition Monitoring Using Physical Chemosensors / Jochen Kuntner." Aachen : Shaker, 2008. http://d-nb.info/1164342134/34.

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Grantham, Andrew James. "The development of portable chemosensors for atmospheric radicals." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/20210/.

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The complex photochemical oxidation cycles involved in the degradative removal of anthropogenic and biogenic hydrocarbons from the atmosphere are mediated by a range of radical intermediates (e.g. peroxyl radicals). Thus these radicals are of particular interest in relation to air quality and human health. Speciated measurements of atmospheric radicals pose considerable challenges to analytical chemists. Owing to their low concentrations, high reactivity and short lifetimes, free radical species cannot be easily sampled; therefore direct offline analysis is extremely difficult. Issues such as selectivity, full structure determination, portability and cost (logistics, power, expertise) remain challenging obstacles to atmospheric radical analysis. Within this thesis, the synthesis and development of a series of novel chemosensors is presented. These are organic trapping compounds that can efficiently and selectively react with a range of radical species. The chemosensor is designed with the aim of radical addition to a double bond, resulting in the loss of a stable radical leaving group. The trapped radical structure is maintained in the reaction products, which are sufficiently stable for offline mass spectrometry. This approach allows for accurate determination of the radical structures and is different to traditional spin trapping, with the captured radical now converted to a stable non radical form. The developed chemosensors have been tested and evaluated in laboratory and chamber experiments by application to a range of atmospherically relevant systems (e.g. alkene ozonolysis and reactions of .OH with alkanes), giving key insights into radical selectivity and reaction mechanisms. They have also been applied to measurements of indoor and outdoor air, providing evidence for the function of this system at atmospheric radical concentrations.
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Figueira, Flávio Alberto da Silva. "Expanded porphyrins and their evaluation as anion chemosensors." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13247.

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Doutoramento em Química
Expanded porphyrins are synthetic analogues of porphyrins, differing from the last ones and other naturally occurring tetrapyrrolic macrocycles by containing a larger central core, with a minimum of 17 atoms, while retaining the extended conjugation features that are a tremendous feature of these biological pigments. The core expansion results in various systems with novel spectral and electronic features, often uniques. Most of these systems can also coordinate cations and/or anions, and in some cases they can bind more than one of these species. In many cases, these molecules display structural features, such as non-planar structures, that have no antecedents in the chemistry of porphyrins or related macrocyclic compounds. This work will discuss several synthetic approaches for the synthesis of expanded porphyrins, namely the construction of new building blocks by Michael addition, as well as potential synthetic routes towards expanded porphyrins. The synthesis of smaller oligopyrrolic compounds namely, bipyrroles and dipyrromethanes, not only were developed for the synthesis of expanded porphyrins as they were also used in Knoevenagel condensations furnishing chromogenic compounds able to recognize different anions in solution. Also, an approach to the synthesis of novel expanded porphyrins namely sapphyrins has been done by aza-Michael additions. Several synthetic routes towards the synthesis of pyridyl and pyridinium N-Fused pentaphyrins and hexaphyrins have been explored in order to achieve compounds with potential applications in catalysis and PDI, respectively. Studies on the synthesis of compounds with potential anion binding properties, led to the structural characterization and NMR anion binding studies of [28]hexaphyrins functionalized with several diamines in the para position of their pentafluorophenyl groups. These compounds allow NH hydrogen bond interactions with various anions. All synthesized compounds were fully characterized by modern spectroscopic techniques.
Porfirinas expandidas são análogos sintéticos das porfirinas, diferindo destes apenas por possuírem um core contendo no mínimo 17 átomos. A expansão do core resulta em vários sistemas com novas características electrónicas e espectrais, e numa extraordinária química de coordenação. Em muitos casos é também possível interação supramolecular com um ou vários aniões. Outra característica interessante é a possibilidade destes macrociclos acomodarem mais do que um estado de oxidação variando as suas características de aromaticidade e planaridade sem antecedentes na química de macrociclos tetrapirrólicos e derivados. Este trabalho discute diversas rotas de síntese de macrociclos expandidos e sua derivatização, bem como a síntese de precursores bipirrólicos sobejamente conhecidos pela sua utilização como precursores na síntese de Porfirinas expandidas. Para este fim, unidades do tipo bipirrolico foram funcionalizadas através de adições de Michael. Estes pequenos compostos foram também derivatizados através de condensações de Knoevenagel para aplicação em coordenação de aniões demonstrando reconhecimento de diferentes aniões mediante uma variação de cor específica. No seguimento destes estudos de reactividade por Diels-Alder e/ou adições de Michael obtiveram-se novos derivativos do tipo safirina com substituições no interior do macrociclo. Tendo em vista a síntese de compostos com reconhecimento de aniões e potencial aplicação em PDT/PDI e catálise, macrocrociclos do tipo pentafirina e hexafirina foram derivatizados com diversos nucleófilos. Neste último, a introdução de grupos amino na sua periferia conduziu a um aumento drástico da capacidade de interação com aniões em solventes polares. Estudos de RMN com os compostos capazes de reconhecer aniões possibilitou a sua total caracterização estrutural demonstrando estruturalmente os grupos que participam no reconhecimento de aniões. Todos os compostos presentes sintetizados foram caracterizados estruturalmente com recurso a diversas técnicas espectroscópicas, nomeadamente: à ressonância magnética nuclear de protão, carbono 13 e de flúor 19, à absorção no Ultravioleta-Visível, à espectrometria de massa e sempre que possível a análise de raio-X de monocristal.
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Books on the topic "Chemosensors"

1

Wang, Binghe, and Eric V. Anslyn, eds. Chemosensors. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.

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Chemosensors: Principles, strategies, and applications. Hoboken, N.J: Wiley, 2011.

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Anslyn, Eric V., and Binghe Wang. Chemosensors: Principles, strategies, and applications. Hoboken, N.J: Wiley, 2011.

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Desvergne, J. P., and A. W. Czarnik, eds. Chemosensors of Ion and Molecule Recognition. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-3973-1.

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P, Desvergne J., Czarnik Anthony W. 1957-, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Research Workshop on Chemosensors of Ion and Molecule Recognition (1996 : Bonas, France), eds. Chemosensors of ion and molecule recognition. Dordrecht: Kluwer Academic, 1997.

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Czarnik, Anthony W., ed. Fluorescent Chemosensors for Ion and Molecule Recognition. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1993-0538.

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1957-, Czarnik Anthony W., American Chemical Society. Division of Organic Chemistry., and American Chemical Society Meeting, eds. Fluorescent chemosensors for ion and molecule recognition. Washington, DC: American Chemical Society, 1993.

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P, Desvergne J., and Czarnik Anthony W, eds. Chemosensors of ion and molecule recognition: [proceedings of the NATO Advanced Research Workshop on Chemosensors of Ion and Molecule Recognition, Bonas, France, August 31-September 4, 1996]. Dordrecht: Kluwer Academic, 1997.

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Schild, Detlev, ed. Chemosensory Information Processing. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75127-1.

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NATO Advanced Research Workshop on Information Processing of Chemical Sensory Stimuli in Biological and Artificial Systems (1989 Göttingen, Germany). Chemosensory information processing. Berlin: Springer-Verlag, 1989.

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Book chapters on the topic "Chemosensors"

1

Gibb, Bruce C. "Van Der Waals Interactions and the Hydrophobic Effect." In Chemosensors, 3–18. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch1.

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Wang, Hui, Yan Chen, and Weihong Tan. "Aptamer Selection, Phage Display, and Sensor Development." In Chemosensors, 191–209. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch10.

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Yamaguchi, Hiroyasu, Tomoki Ogoshi, and Akira Harada. "Sensor Development Using Existing Scaffolds." In Chemosensors, 211–26. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch11.

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Parkesh, Raman, Emma B. Veale, and Thorfinnur Gunnlaugsson. "Fluorescent Detection Principles and Strategies." In Chemosensors, 229–52. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch12.

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Heagy, Michael D. "New Fluorophore Design." In Chemosensors, 253–73. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch13.

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Bicker, Kevin L., Sheryl L. Wiskur, and John J. Lavigne. "Colorimetric Sensor Design." In Chemosensors, 275–95. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch14.

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Bayly, Simon R., George Z. Chen, and Paul D. Beer. "Electrochemical Detection." In Chemosensors, 297–328. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch15.

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Liu, Yang, Archana Jaiswal, Mark A. Poggi, and W. David Wilson. "Surface Plasmon Resonance and Quartz Crystal Microbalance Methods for Detection of Molecular Interactions." In Chemosensors, 329–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch16.

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Anzenbacher, Pavel, and Manuel A. Palacios. "Array-Based Sensors." In Chemosensors, 345–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch17.

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Fahrni, Christoph J. "Design of Cation-Selective Synthetic Fluorescent Indicators." In Chemosensors, 371–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118019580.ch18.

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Conference papers on the topic "Chemosensors"

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Lieberzeit, Peter A., A. Rehman, B. Najafi, A. Mujahid, and Franz L. Dickert. "Acoustic chemosensors for real-life environments." In 2008 IEEE International Frequency Control Symposium. IEEE, 2008. http://dx.doi.org/10.1109/freq.2008.4623033.

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Ueno, Akihiko, Hiroshi Ikeda, and Taiyo Aoyagi. "Signal transduction in chemosensors of modified cyclodextrins." In BiOS '97, Part of Photonics West, edited by Richard B. Thompson. SPIE, 1997. http://dx.doi.org/10.1117/12.273523.

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Lehmann, Hartmut, Sven Brueckner, Jens Kobelke, Guenter Schwotzer, Kay Schuster, and Reinhardt Willsch. "Toward photonic crystal fiber based distributed chemosensors." In Bruges, Belgium - Deadline Past. SPIE, 2005. http://dx.doi.org/10.1117/12.623667.

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Maria, Letizia De, Nunzio Cennamo, Luigi Zeni, Fabio Scatiggio, and Maria Pesavento. "Optical chemosensors for transformers’oil degradation monitoring:case studies." In 2018 AEIT International Annual Conference. IEEE, 2018. http://dx.doi.org/10.23919/aeit.2018.8577418.

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Prodi, Luca, Fabrizio Bolletta, Marco Montalti, and Nelsi Zaccheroni. "Searching for new luminescent chemosensors for metal ions." In BiOS '99 International Biomedical Optics Symposium, edited by Joseph R. Lakowicz, Steven A. Soper, and Richard B. Thompson. SPIE, 1999. http://dx.doi.org/10.1117/12.347554.

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Fernández-Lodeiro, Javier, Cristina Núñez, Adrián Fernández-Lodeiro, Elisabete Oliveira, Hugo M. Santos, Alcindo A. Dos Santos, José Luis Capelo, and Carlos Lodeiro. "Novel Nano-Structured Chemosensors in Organic and Aqueous Phase." In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_201398211246.

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Prodi, L., L. S. Dolci, M. Montalti, N. Zaccheroni, G. Farruggia, G. Andreani, E. Carpenè, et al. "New fluorescent chemosensors for magnesium ions in living cells." In Biomedical Optics 2006, edited by Samuel Achilefu, Darryl J. Bornhop, and Ramesh Raghavachari. SPIE, 2006. http://dx.doi.org/10.1117/12.645783.

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Raposo, M. Manuela, R. Cristina M. Ferreira, and Susana P. Costa. "Phenanthroimidazole derivatives as fluorimetric chemosensors in aqueous medium." In The 19th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2015. http://dx.doi.org/10.3390/ecsoc-19-a014.

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Podgorsek, R. P., U. Sandten, and Hilmar Franke. "SPR-leaky-mode spectroscopy with polymer films for optical chemosensors." In Lasers and Materials in Industry and Opto-Contact Workshop, edited by Roger A. Lessard. SPIE, 1998. http://dx.doi.org/10.1117/12.323508.

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Fahmi, Muhammad Riza Ghulam, Yehezkiel Steven Kurniawan, Leny Yuliati, and Hendrik O. Lintang. "Selective optical chemosensors of Fe3+ ions using 1H-indole-2,3-dione." In PROCEEDINGS OF THE 5TH INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5134626.

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Reports on the topic "Chemosensors"

1

Shepodd, Timothy J., Thomas Zifer, James Ross McElhanon, and Larry A. Rahn. Biological detection and tagging using tailorable, reactive, highly fluorescent chemosensors. Office of Scientific and Technical Information (OSTI), November 2006. http://dx.doi.org/10.2172/895704.

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Kawakami, J., R. T. Bronson, G. Xue, J. S. Bradshaw, and R. M. Izatt. Characterization of Bis-8-hydroxyquinoline-Armed Diazatrithia-16-crown-5 and Diazadibenzo-18-crown-6 Ligands as Fluorescent Chemosensors for Zinc. Fort Belvoir, VA: Defense Technical Information Center, June 2002. http://dx.doi.org/10.21236/ada406097.

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Guttinger, Kimberly. Multi-Dimensional Analysis of Fluorescent Chemosensor Data. Portland State University Library, January 2015. http://dx.doi.org/10.15760/honors.194.

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Greenberg, E. P. Electrophysiological and Genetic Analysis of Chemosensory Mechanisms in Spirochaeta Aurantia. Fort Belvoir, VA: Defense Technical Information Center, May 1988. http://dx.doi.org/10.21236/ada197188.

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Savage, Paul B., Ning Su, Jerald S. Bradshaw, Reed M. Izatt, and Luca Prodi. N,N-Bis-(8-hydroxy-5-nitroquinolin-7-ylmethyl)diaza-18-crown-6, a Chemosensor for Mercury Ions. Fort Belvoir, VA: Defense Technical Information Center, March 2000. http://dx.doi.org/10.21236/ada375273.

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