Partial second-order effects in [AmBnX] systems; reinterpretation of the fluorine-19 nuclear magnetic resonance spectrum of caesium trans-bis(trifluoromethyl)tetrafluorophosphate, Cs+[(CF3)2PF4]–

Abstract

If some but not all multiplets of a n.m.r. spectrum show second-order effects, the relative signs of certain coupling constants are thereby known. The ¹⁹F spectrum of the title compound is reinterpreted in this light, and general applications are discussed. Exact parameters can be found simply by first-order interpretation of such a spectrum