Dendron-Functionalized Bis(terpyridine)–Iron(II) or –Cadmium(II) Metallomacrocycles: Synthesis, Traveling-Wave Ion-Mobility Mass Spectrometry, and Photophysical Properties

Authors

  • Dr. Jin-Liang Wang,

    1. Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
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  • Dr. Xiaopeng Li,

    1. Department of Chemistry, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-6085
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  • Xiaocun Lu,

    1. Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
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  • Dr. Yi-Tsu Chan,

    1. Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
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  • Dr. Charles N. Moorefield,

    1. Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
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  • Prof. Dr. Chrys Wesdemiotis,

    Corresponding author
    1. Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
    2. Department of Chemistry, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-6085
    • Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
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  • Prof. Dr. George R. Newkome

    Corresponding author
    1. Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
    2. Department of Chemistry, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-6085
    • Departments of Polymer Science, The University of Akron, 302 Buchtel Common, Akron, OH, 44325 (USA), Fax: (+1) 330-972-2368
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Abstract

The synthesis, purification, structural analysis, and photophysical properties of a series of five-, six-, and seven-sided FeII macrocycles and the corresponding hexameric CdII macrocycle, all prepared by self-assembly of a 120° bis(terpyridine) ligand modified with first- and second-generation 1→3 C-branched dendrons, are reported. All metallomacrocycles were fully characterized by 1H and 13C NMR spectroscopy, traveling-wave ion-mobility mass spectrometry (TWIM MS), molecular modeling, UV/Vis absorption spectroscopy, photoluminescence, and cyclic voltammetry. A gradual increase of the collision cross sections of the FeII metallomacrocycles was observed with a successive increase of the number and molecular size of the ligands. The combination of ion-mobility mass spectrometry and NMR techniques unveils structural features that agree well with calculations. Extinction coefficients and emission are significantly modulated by increasing the ring size and changing the metal ion center from FeII to CdII.

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