Applications of pulsed field gradient spin-echo measurements for the determination of molecular volumes of organometallic ionic complexes

H-1 and F-19 Pulsed Field Gradient Spin-Echo (PGSE) measurements on a selec tion of ruthenium(II) organometallic arene complexes have been made. F-19 p rovides a useful complement to the classical H-1 measurements and is especi ally valuable in the absence of suitable protons and/or overlap of signals from different compounds with similar size. This methodology for estimating molecular size of ionic complexes represents an alternative to classical m ethods in organometallic chemistry. One complex is shown to have a molecula r volume which corresponds to a tight ion pair.