The compound (ND4)2[FeCl5(D2O)], has awakened a renewed interest owing to its recent classification as a new multiferroic material. We have recently investigated the nuclear and the magnetic structure of (ND4)2[FeCl5(D2O)] at zero magnetic field, proving that the mechanism of multiferroicity is the spin current mechanism induced via the inverse Dzyaloshinskii-Moriya interaction. However the magnetic structures obtained under magnetic field cannot be explained using this mechanism. We have proposed a model based spin-dependent p-d hybridization mechanism, as the origin of multiferroicity. This mechanism is associated with changes in the Fe-Cl or Fe-Ow bond distances, breaking the center of symmetry, which should be the final responsible of the multiferroicity observed for magnetic fields above 4.5 T. In order to verify the occurrence of nuclear distortions related with the spin-dependent p-d hybridization mechanism, we ask for 7 days of beam-time on D9 sigle crystal diffractometer equipped with the 6T-CNRS cryomagnet.