Applications of Pulsed‐Gradient Spin‐Echo (PGSE) Diffusion Measurements in Organometallic Chemistry

Diffusion data from pulsed‐field gradient spin‐echo (PGSE) methods are shown to be qualitatively useful in the investigation of problems involving unknown molecular aggregation and/or the nature of inter‐ionic interactions in metal complexes. For charged species possessing anions such as PF, BF, CF₃SO or BArF⁻, both ¹⁹F‐ and ¹H‐PGSE methods offer a valid alternative and, sometimes, unique view of gross and subtle solution molecular structure and dynamics. Problems associated with solvents, concentration, and reproducibility are discussed.