ABSTRACT: A series of half-sandwich ruthenium-(II) complexes bearing substituted α-diimine ligands with the general formula [RuCl-(p-cym)-(N-N n )]-(PF6) was synthesized (where n = 1-7; N-N 1 = N1,N2-bis(2,6-dimethylphenyl)-ethane-1,2-diimine, N-N 2 = N1,N2-bis(2,4-dimethylphenyl)-ethane-1,2-diimine, N-N 3 = N1,N2-bis(2,4,6-trimethylphenyl)-ethane-1,2-diimine, N-N 4 = N1,N2-bis[2,6-bis-(propan-2-yl)-phenyl]-ethane-1,2-diimine, N-N 5 = N1,N2-bis(4-fluorophenyl)-ethane-1,2-diimine, N-N 6 = N1,N2-bis(4-chlorophenyl)-ethane-1,2-diimine and N-