Lanthanide-induced shifts in inorganic and organometallic compounds: a method for distinguishing between N- and S-thiocyanato-compounds

Appreciable Lanthanide-induced shifts are ob-served in the 1H n.m.r. spectra of organic thiocynates on addition of tris-(7,7-dimethyl-1,1,1,2,2,3,3-heptafluoro-octane-4,6-dionato)europium(III)[Eu(fod)3], but not in the spectra of isothiocyanates RNCS; a similar distinction in behaviour occurs for inorganic compounds containing S- and N-thiocyanato-groups and suitable proton-containing ligands, and provides a convenient method for distinguishing between possible isomers.