Compound 1 contains a rigid chelating ligand and compounds 2 and 3 contain monodentate dangling pyridine ligands. The rigid chelating ligand can efficiently change the phonon induced magnetization relaxation processes at low temperatures.
Clear frequency-dependent out-of-phase signals as well as a series of careful experiments indicate that the purely nitrogen coordinated mononuclear Co(ii) complex reported here is a SIM.
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