The syntheses of two new NP 3 ligands containing propylene linkages, prNP 3 (1) = N(CH 2 CH 2 CH 2 PPh 2 ) 3 and prPNetP 2 (2) = (Ph 2 PCH 2 CH 2 CH 2 )N(CH 2 CH 2 PPh 2 ) 2 are reported. Using these ligands, bis(dinitrogen) complexes of molybdenum are synthesized and characterized by IR and NMR spectroscopy. The new systems are com-83 pared with the literature-known complex [Mo(N 2 ) 2 (NP 3 )] (3) supported by the ligand NP 3 [NP 3 = N(CH 2 CH 2 PPh 2 ) 3 ], which only contains ethylene linkages. Application of the new ligand reduces the symmetry of the complex and leads to the occurrence of different isomers.