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This work was partially supported by FEDER funds through the Operational Programme Competitiveness Factors – COMPETE and national funds by Foundation for Science and Technology (FCT) under the strategic project UID/NEU/04539/2013; by QOPNA research Unit of University of Aveiro and FCT/MEC (FCT UID/QUI/00062/2013) cofinanced by the FEDER, (PT2020) Partnership Agreement and also the Portuguese NMR Network; and by FAPESP (São Paulo Research Foundation – Brazil) 2013/07276-1 and 2015/21110-4 for the semi-synthesis of Zn(II)e6Me. CF and IM are recipients of postdoctoral fellowships from FCT (respectively, SFRH/BPD/63733/2009 and SFRH/BPD/113285/2015).