A molecular complex comprising imidacloprid and a phenolic compound having a formula (II) R includes -OH, -COOH, -CI, -Br, -CONH2, -CH3, alkyl, aryl, allyl, formyl or amine group is disclosed. A process for preparation of said molecular complex is also disclosed.Linvention concerne un complexe moléculaire comprenant de limidaclopride, et un composé phénolique de formule (II) R comprend -OH, -COOH, -Cl, -Br, -CONH2, -CH3, un groupe alkyle, aryle, allyle, formyle ou amine. Elle concerne également un procédé de préparation dudit complexe moléculaire.