Conformational effects in inorganic heterocyclic radicals; generation and e.s.r. characterization of the thiatriphosphatetrazocinyl radical [Ph6P3N4S]˙

Abstract

The reaction of [Ph₆P₃N₄H₂]⁺Cl^– with sulphur dichloride affords the eight-membered 1,3,5,7,2,4,6,8-thiatriphosphatetrazocine Ph₆P₃N₄SCl, which can be reduced by triphenylantimony to the corresponding thiatriphosphatetrazocinyl radical [Ph₆P₃N₄S]˙; the temperature dependence of the e.s.r. spectrum of this radical provides a unique demonstration of the effects of conformational rigidity in an oligophosphazene skeleton.