A method of analysis interaction energies in three-molecular nanocluster containing hydrocarbon moleculas with double carbon-carbon bonds. One of the molecule (pentene) has dipole moment, others (aromatic volecules) has no dipole moments. The molecules in the considered nanocluster are bounded by long-range dispersion and induction forces with Coulomb repulsive forces at short intermolecular distances. Analytical expressions for calculations of intermolecular forces versus intermolecular distances were obtained in the frame of the presented method with Colomb repulsive taking into account. By this, specific charge properties of the double bonds, which leads to the rest positive charges of the carbon atoms, were considered. It was shown, that the summing interaction energies reached their minimum by smaller intermolecular distances in the considered three-molecular hydrocarbon nanocluster comparing to the two - molecular isolated nanocluster consisted from the same molecules
36.40.-c Atomic and molecular clusters
$^1$D.V.Scobeltsyn Institute of Nuclear Physics, M.V.Lomonosov Moscow State University,