Abstract
As a novel electron magnetic resonance technique for the characterization of organic molecule-based magnetic materials, an electron spin transient nutation method based on Fourier-transformed pulsed ESR spectroscopy was applied to polycationic organic polymers of π-topology-mediated molecular design. The polymers are triphenylamine-based in the hyperbranched three-dimensional network with the unpaired electrons at the nitrogen cation sites. The FID-detected nutation spectrum from one of the polymers exhibited several nutation-frequency components corresponding to high-spin species containing S=l to S=3. The static magnetic susceptibility of the polymer supported the high-spin ground state in the system under study. The present results demonstrate the potentialities of the pluri-charged high-spin polymeric systems as well as the methodological advantage of nutation spectroscopy in identifying the spin multiplets of the molecule-based magnetic materials in the frequency domain.
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