Study on S-benzyl-N-(ferrocenyl-1-methyl-metylidene)-Dithiocarbazate Nickel(II)/Cobalt(II) Complexes by In-situ FTIR Spectroelectrochemistry

Comparative studies were carried out by using electrochemistry and in-situ FTIR spectroelectrochemistry for nonlinear optical complexes, S-benzyl-N-(ferrocenyl-1-methyl-metylidene)-dithiocarbazate nickel (Ⅱ)/cobalt (Ⅱ) complexes (Ni(LSB) 2/Co(LSB) 2). The results indicated that Ni(LSB) 2 involves two consecutive reversible one-electron oxidation steps, while Co(LSB) 2 involves only one two-electron oxidation step. Ni(LSB) 2 complex that has a square planar configuration exhibits a moderately strong electronic communication between the two-ferrocene moieties, taking place through the skeleton chain of the ligand due to the extensive electron delocalization in the whole molecule and leads to the appearance of a strong ν CC vibration band at 1 453 cm -1 during the oxidation process, while Co(LSB) 2 complex that has a tetrahedral configuration shows low electron delocalization and has two almost identical ferrocene moieties.