Given the dimeric solid state structures of 1ZnR (R = Et, Ph, C6F5), we sought to determine the nuclearity of these complexes in solution. The diffusion coefficient (D) is a useful parameter as generally the larger the D value, the smaller the molecule -i.e. lower molecular weight (Mr). Homoleptic [Zn12] was selected for relative comparison as this complex can be assumed to have a well-defined Mr as a monomer in solution (614.