The interaction of benzene with ternary GICs MHgC(8) (M=K, Rb) has bee
n investigated and new quaternary compounds MHgC(8)(C6H6)(2) were obta
ined. X-ray data, Fourier transform of 001 reflections and spin-lattic
e relaxation measurements show that benzene molecules intercalate into
the empty galleries of the amalgam GICs.