Abstract The synthesis, structure, and conformational mobility of a trans-bis (aminophenolato) platinum (II) complex bearing a dodecamethylene bridge,[Pt (L)](1)[H 2 L= N, N′-Dimethyl-N, N′-bis (2-hydroxyphenylmethyl) dodecane-1, 12-diamine] are described. The 2D NMR and X-ray diffraction analysis revealed that the complex has a “reversed U”-shaped syn conformation in the solution state, which is mainly due to steric ...