The temperature dependence of resistivities of the complexes lignocainehydrochloride-chromium (CRE), monochlorotrinitro copper(II) lignocaine (CUNL) and lignocainehydrochloride-manganese (MNL) has been studied. All the compounds exhibit semiconducting behaviour which cars be accounted for by the stacking of the donor and acceptor molecules in the crystal structure. The degree of fall of resistivity of the compounds decreases in the order MNL, CRL, CUNL, The complex CUNL shows appreciable conductivity in the temperature range 234-279 K, as well as in the range 388-468 K. This behaviour might be attributed to the phase transition (if it exists) of the complex at a lower temperature
