A new, highly potent 1,8-naphthalimide-based fluorescence turn-off chemosensor capable of detecting Cu(II) ions in real-world water samples / Chuang Li in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 230-239 Titre : A new, highly potent 1,8-naphthalimide-based fluorescence turn-off chemosensor capable of detecting Cu(II) ions in real-world water samples Type de document : texte imprimé Auteurs : Chuang Li, Auteur ; Xintong Han, Auteur ; Shanshan Mao, Auteur ; Stephen Opeyemi Aderinto, Auteur ; Xinkui Shi, Auteur ; Kesheng Shen, Auteur ; Huilu Wu, Auteur Année de publication : 2018 Article en page(s) : p. 230-239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Eaux usées -- Recyclage Ions cuivre Produits chimiques -- Détection Récupération (Déchets, etc.) Index. décimale : 667.3 Teinture et impression des tissus Résumé : The synthesis of a new 1,8-naphthalimide-based fluorescence turn-off chemosensor for the effective detection of Cu(II) ions is reported. The chemosensor MAST was characterised by mp, Fourier Transform-infrared (FTIR), ultraviolet-visible (UV-vis), fluorescence, 1H-NMR and 13C-NMR spectroscopy, and mass spectrometry. After treatment with Cu(II) ions in coexistence with various competitive metal ions in a dimethylsulphoxide (DMSO)/4-2-hydroxyethyl)-1-piperazineethanesulphonic acid (HEPES) buffer solution (v/v, 1:1; pH 7.4), the chemosensor demonstrated high selectivity towards Cu(II) ions and a fluorescence quenching of 83.67% was observed. In addition, a good linear response for the chemosensor detecting Cu(II) ions was obtained over the concentration range 0.2–1 µm. The combined results of UV-vis and fluorescence titrations with the Job plot yielded a 1:1 stoichiometric interaction of the chemosensor with Cu(II) ions. The association constant and detection limit were calculated as 1.37 x 10-6 m-1 and 1.69 x 10-8 m, respectively. Based on results, the quenching response of MAST towards Cu(II) ions could be ascribed to the reverse-photoinduced electron transfer (PET) mechanism. Finally, the proposed chemosensor was applied to quantify Cu(II) ions in real-world water samples and excellent recovery rates of 98–105.8% were obtained. Note de contenu : - EXPERIMENTAL : Reagents and materials - Instrumentation - Procedures for spectroscopic measurements - Procedures for spectroscopic measurements - Synthesis - Synthesis of intermediate compound 2, 3 and 4 - Synthesis of the proposed chemosensor, MAST - RESULTS AND DISCUSSION : Synthesis and characterisation - Investigation of the photophysical properties of MAST - Investigation of the effect of pH on the sensing properties of MAST - UV-vis and fluorescence titration of MAST towards Cu(II) ions - Spectroscopic assessment of MAST in the presence of various metal ions - Selectivity study of MAST for Cu(II) ions over competitive metal ions - Determination of the soichiometric ratio and binding constant - Determination of the detection limit of MAST - Propsed sensing mechanism - response time - Real-worl application of MAST for Cu(II) quantification DOI : 10.1111/cote.12340 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12340 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30647 [article]

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Synthesis and studies of two proton-receptor fluorescent probes based on 1,8-naphthalimide / Stephen Opeyemi Aderinto in COLORATION TECHNOLOGY, Vol. 133, N° 1 (02/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 1 (02/2017) . - p. 40–49 Titre : Synthesis and studies of two proton-receptor fluorescent probes based on 1,8-naphthalimide Type de document : texte imprimé Auteurs : Stephen Opeyemi Aderinto, Auteur ; Han Zhang, Auteur ; Huilu Wu, Auteur ; Chengyong Chen, Auteur ; Jiawen Zhang, Auteur ; Hongping Peng, Auteur ; Zaihui Yang, Auteur ; Fei Wang, Auteur Année de publication : 2017 Article en page(s) : p. 40–49 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : pH -- Mesure Sondes fluorescentes Index. décimale : 535.6 Couleur Résumé : Two isomeric proton–receptor fluorescent probes 1 and 2 were designed and synthesised by employing the photoinduced electron transfer (PET) principle of a ‘fluorophore–spacer–receptor’ module. Their photophysical characteristics were investigated in organic solvents and Britton–Robinson buffer/EtOH (1:1, v/v) solution. Probe 1 was sensitive in the stronger acidic region of 2.21–4.56, while probe 2 displayed a good response towards protons within the pH scope of 4.10–6.09. The specificity of the probes toward protons in commonly used buffer solutions and in the presence of metal cations, Na(i), K(i), Ca(ii), Mg(ii), Al(iii), Pb(ii), Fe(iii), Ni(ii), Zn(ii), Cu(ii), Hg(ii), Ag(i), Co(ii), Cr(iii), Mn(ii), and Cd(ii) ions, was studied by monitoring the changes in their fluorescence intensity. The tested metal ions exerted no noticeable influence. The results obtained show that the synthesised proton–receptor fluorescent probes have the capability to act as pH-sensitive probes for monitoring pH variations in the range 2.21–6.09. Note de contenu : - EXPERIMENTAL : Optical absorption spectroscopy - Fluorescence spectroscopy - Tolerance of probes to H+ over other metal ions - RESULTS AND DISCUSSION : Design and synthesis of probes based on the PET process - Photophysical characteristics of probes - pH effect on the absortion and fluorescence properties of the probes DOI : 10.1111/cote.12250 En ligne : https://drive.google.com/file/d/1tPbwfGZ7Mglq5DMD772MAMJfjyjtfsN-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27879 [article]

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