Steady-state limiting currents for the electroreduction of undiluted nitromethane and two other nitroalkanes are easily obtained by voltammetry and chronoamperometry at Pt microelectrodes. Since the electrode process is one-electron and the couterion is tetraalkylammonium cation, it is concluded that microlayers of ionic liquid of the stoichiometry ANO(2)(-)R(4)N(+) are formed at the microelectrode surface, where R denotes either -(CH2)(3)CH3 or -(CH2)(5)CH3 and A stands for the appropriate alkane. The results of gravitational and temperature experiments indicate that the ionic layer is more viscous and less dense compared to pure corresponding nitroalkane. Behind the potential range of the limiting steady-state current, at potentials more negative than -6 V vs Pt quasi-reference electrode, unusual, very reproducible oscillations are formed. These oscillations are thought to be related either to the upward gravitational movement of microdrops of the ionic liquid formed or the electroreduction of the counterion and consecutively to periodical changes in the true electrode potential of the Pt microelectrode.