1H and 19F magnetic resonance imaging of solid paramagnetic compounds using large magnetic field gradients and Hahn echoes.

1H and 19F spatially resolved echo trains of a number of paramagnetic solids with apparent magnetic moments as high as 10 Bohr magnetons have been successfully obtained in the 58 T m-1 fringe-field gradient of a 9.4 T superconducting magnet by the use of Hahn echoes. Complexes studied include hydrates of Ni(II), Fe(III), Mn(II), and the anhydrous fluorides of Ti(III), Co(II) and Mn(II). Tris 6,6-7,7-8,8,8 heptafluoro-2,2-dimethyl-3,5octane dionato complexes of several lanthanides, Eu, Dy, Ho and Yb, have also been imaged. Additionally, 1H relaxation time measurements have been obtained at 28 MHz with conventional techniques, and several additional T2 values have been obtained in the stray field for both 1H and 19F.