In the tetraazamacrocyclic ligand N,N’-dimethyl-2,11-diaza-[3.3](2,6)pyridinophane (L-N4Me2), the two pyridine units are separated from each other by sp3-hybridized triatomic bridges. Such electronically isolated pyridine moieties are considerably less prone to reductions than di- or triimines.
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