“…Gas-phase studies on ''isolated'' reactants provide an ideal venue for investigating reaction mechanisms and kinetics at a strictly molecular level. 7,[23][24][25][26] Recently, some encouraging developments in N 2 activation have been reported in the gas phase studies, [27][28][29][30][31] and the ligand effect significantly affects cluster reactivity. Gas-phase clusters usually contain metal atoms coupled with inorganic ligands, such as oxygen, boron, hydrogen, carbon, sulfur, and so on.…”