Fullerene and its derivatives have become materials of great technological interest due to their growing success as electron acceptors in organic photovoltaic cells (OPVs). Despite this success, there is still a very poor understanding of the structural and dynamical properties of these materials. Following a successful QENS study on OSIRIS on pure PCBM, and an express run on TOSCA in 2014 this proposal seeks to extend our study by looking at deuterated samples of PCBM in order to understand the details of the vibrations of side chains of PCBM. This investigation will be complemented with computational simulations to get detail assignments of vibrational modes.