The compound proposed for this study is an interesting example of how strongly spectroscopic properties of pyrene derivatives in the solid state can depend on the crystal packing environment. We intend to study that effect by means of experimental electron density analysis and theoretical calculations. We have already collected high quality, high resolution X-ray data for the compound, necessary to refine aspherical model of experimental electron density. High quality neutron data are necessary to provide an accurate description of molecular geometry, in particular the exact hydrogen atom positions and atomic displacements, that cannot be obtained otherwise. We propose to conduct two single crystal neutron diffraction experiments at 20K and 90K in order to obtain accurate atomic positions and verify the presence/absence of anharmonic vibrations in the molecule.