Polycationic high-spin states of 1,3-bis(diarylamino)benzene and 1,3,5-tris(diarylamino)benzene as prototypical model units for organic ferromagnetic metals have been studied by cw and pulsed ESR spectroscopy. An electron spin transient nutation (ESTN) method as a novel technique based on pulsed ESR spectroscopy has been applied to the dicationic and tricationic high-spin states of them in glasses, unequivocally identifying the spin multiplicities of those molecules in the ground state to be triplet with the fine-structure parameters of |D| = 0.007 cm-1 and quartet with |D| = 0.004 cm-1, |E| = 0.0002 cm-1, and g = 2.0023, respectively, and concluding that the high-spin ground states originate from the topological pseudodegeneracy of the π-HOMOs which governs spin alignment in polycationic heteroatomic systems. It has been illustrated by the resolution enhancement inherent in the dimensional decomposition of 2D spectroscopy that magnetic-field-swept 2D ESTN spectroscopy is a powerful and facile method for spin identification and discrimination between different spin multiplicities in nonoriented systems. Also, ESTN phenomena have been treated in terms of both numerical calculation and perturbation theory. An analytical expression for the nutational motion has been derived.

The title compound 1 (TPTTA), a novel starburst molecule consisting of a nelectron system, was synthesized with the aim of developing amorphous molecular materials having high glass-transition temperatures. The material shows 1 unique solid-state morphology; it readily forms a stable amorphous glassy state with a glass-transition temperature as high as 141 "C, as characterized by differential scanning calorimetry and X-ray diffraction. Pellet samples of TPTTA doped with iodine exhibit room-temperature conductivities up to IO-'Scrn-'.

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Tri(bipheny1-4-yl)amine is found to constitute a new class of photo-and electro-active amorphous molecular materials. The material readily forms an amorphous glass with a glass-transition temperature of 76 "C, as characterized by differential scanning calorimetry, X-ray diffraction and Rarnan spectroscopy. Its glass-forming properties are discussed in the light of its molecular and crystal structures determined by X-ray crystallography. The material in the glassy state shows a relatively high hole drift mobility of 1.5 x cm2 V-' s-' at an electric field of 2 x lo5 V crn-' at 20 "C.Temperature and electric-field dependencies of the hole drift mobility in the glassy state of TBA are discussed.