Syntheses of Model Oligomers for Polyionic Organic Ferromagnetics and their High-Spin Characterization by FT Pulsed Esr/Electron Spin Transient Nutation (Estn) Spectroscopy as a Novel Experimental Technique

Abstract This paper deals with syntheses and unequivocal spin identification of prototypical model oligomers for the π-topological version of an approach to purely organic polyionic polymer ferromagnets, emphasizing that molecular design exploits the topological super pseudo-degeneracy of π-bonding and π-antibonding molecular orbitals (π-HOMOs and π-LUMOs) appearing close to zero energy in heteroatomic π-conjugated organic systems, for polycationic and polyanionic organic polymeric high spins, respectively. The oxidation and reduction states of the oligomers designed according to the topological approach are expected to undergo dynamic spin polarization, leading to high-spin ground states for both polycationic and polyanionic model oligomers. One-dimensional and two-dimensional star-burst polycationic model oligomers with heteroatoms participating in π-conjugation were designed and synthesized. Their electronic high-spin ground states have been identified by means of Two-Dimensional Electron Spin Transien...