Solid state carbon-13 n.m.r. studies of chemical shift anisotropy and ring rotation in the plastic phases of [(C6H6)Fe(C5H5)]+[AsF6]–
Abstract
Variable temperature 13C n.m.r. measurements of chemical shift anisotropy in a powdered sample of U(C6H6)Fe(C5H5)]+[AsF′U]–(1) reveal phase transitions between three different crystal forms, each characterised by a different combination of internal ring rotations and external rotations of the whole cation.