Some of the salts of BEDT-TTF (or ET) family namely ET2Cu5I6, ET3CuCl4
xH2O and ET3AgxI8 are good mixed electron- group Ib ion conductors. Du
e to the presence of frozen disorder in anion layer none of the salts
is a superconductor, though the first two remain metallic properties d
own to lowest temperatures. Disorder and non stoichiometry effect on e
lectron transport properties of ET2Cu5I6 compound have been studied. E
SR studies of ET2Cu5I6 salt show that the line width is strongly incre
ased by the disorder.