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Selective detection of Cu2+ and Co2+ in aqueous media: asymmetric chemosensors, crystal structure and spectroscopic studies Dogaheh, Samira Gholizadeh Khanmohammadi, Hamid Sañudo Zotes, Eva Carolina Fluorescència Ions metàl·lics Estructura cristal·lina (Sòlids) Fluorescence Metal ions Layer structure (Solids) Two new azo-azomethine receptors, H2L1 and H2L2, containing hydrazine, naphthalene and different electron withdrawing groups, Cl and NO2, have been designed and synthesized for qualitative and quantitative detection of Cu2+ and Co2+ in aqueous media. The crystal structure of H2L1 is reported. The H2L1 was used as a chemosensor for selective detection of trace amount of Cu2+ in aqueous media. H2L2 was also applied to naked-eye distinction of Cu2+ and Co2+ from other transition metal ions in aqueous media. Detection limit of Cu2+ is 1.13 mu M and 1.26 mu M, in water, for H2L1 and H2L2, respectively, which are lower than the World Health Organization (WHO) recommended level. The binuclear Cu2+ and Co2+ complexes of the receptors have been also prepared and characterized using spectroscopic methods and MALDI-TOF mass analysis. Furthermore, the binding stoichiometry between the receptors upon the addition Cu2+ and Co2+ has been investigated using Job's plot. Moreover, the fluorescence emission spectra of the receptors and their metal complexes are also reported. (C) 2017 Elsevier B.V. All rights reserved. 2020-03-30T09:49:13Z 2020-03-30T09:49:13Z 2017-05-15 2020-03-30T09:49:13Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1016/j.saa.2017.02.017 Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, 2017, vol. 179, p. 32-41 https://doi.org/10.1016/j.saa.2017.02.017 cc-by-nc-nd (c) Elsevier B.V., 2017 http://creativecommons.org/licenses/by-nc-nd/3.0/es info:eu-repo/semantics/openAccess Elsevier B.V. Articles publicats en revistes (Química Inorgànica i Orgànica)