I published on Pt(II)-Neocuproine complexes. Most of them are monomeric complexes with very simple NMR (doublet, singlet, doublet in the aromatic and singlet for methyls) if neocuproine is symmetric or in rapid exchange when ligands with high trans effect are in the trans positions. Pd should have similar behavior to Pt. You can take a look to my papers.
Thank you for your answer. In fact I observed the similar behavior of the monomeric form, probably in equilibrium with the dimeric one, with other signals. Similar signals observed with the two precursors used for the dimer synthesis. Anyway I am going to check on your paper. Thank you for your time.