Organoboron substituent effects in EPR/ENDOR spectroscopy. Radical ions with boron-carbon and boron-nitrogen bonds. Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry, 9:1497--1501, 1992. [PUMA: ESR ion radical bond organoboron ENDOR ion;ESR ENDOR;carbon effect organoboron;nitrogen boron organo substituent]