NEW MATERIAL:An organic semiconductor obtained by a reaction between an nitrogen oxide shown by the formula I (X is halogen-containing inorganic group; m is 1 or 2) and a heterocyclic compound shown by the formula II [R1WR4 are H, alkyl, alkoxy, aryl, allyloxy, thioether, amino, halogen, CN or NO2; Y is group shown by the formula III (R5 is H, alkyl or aryl), >O, >S or >Se].

EXAMPLE: A reaction product between NOBF4 and thiophene.

USE: An antistatic agent, photoelectric conversion element, optical memory, sensor, rotary disc play, terminal device, etc., being easily produced, having improved oxidation resistance.

PREPARATION: A nitrogen oxide shown by the formula I is reacted with a heterocyclic compound shown by the formula II in an aprotic polar solvent such as dioxane, acetonitrile, etc., at -50W100°C for 0.5W100hr preferably in a liquid phase, to give a reaction product of the drak brown W black powdery compound shown by the formula I and the compound shown by the formula II.