Pyridinophanes are amine ligands containing at least one pyridine donor as part of a macrocyclic ring. Pyclen is the most well-known pyridinophane and is so named due to its twelve membered ring matching the size and spacing of nitrogen donors found in the ubiquitous 12-membered Cyclen tetraazamacrocyle. Many pendant-arm analogues of Pyclen have been published, including some with pendant arm pyridine donors added. However, we believe that our work represents the first Pyclen analogue having three pendant arm pyridines. The new pyridinophane contains seven donor atoms, four of which are pyridine nitrogen atoms. We will present the synthesis and characterization of this new pyridinophane and its coordination chemistry with a range of first-row and some second-row transition metal ions. A designed feature of this ligand is its seven nitrogen donors, which allow for the possibility of heptadentate coordination. We will discuss the characterization of our metal ion complexes with special attention to ligand denticity and complex coordination geometry.

Heptadentate tetraazamacrocyclic pyridinophane bearing four pyridine donors

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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