We report herein the cyclic voltammetry behavior of the compounds [RuCp(L2)(CC{SC4H2}nA)] (L2=DPPE, 2 PPh3; A= NO2, CHO; n=1,2). The effect of the phosphines, length of the conjugated thiophene chain and acceptor (A) group will be addressed. Both the electrochemical and spectroscopic data will be correlated and the overall results will be discussed regarding to the SONLO properties of these compounds.