Synthesis and electrochemical properties of bis(dipyrrinato)zinc complex derivatives

Naphthalene group with 1- or 2-link position was substituted into 5-position of dipyrrinato zinc complex and bis[5-(1-naphthalenyl)-dipyrrinato]zinc complex (Zn(1-NaPN)2) and bis[5-(2-naphthalenyl)-dipyrrinato]zinc complex (Zn(2-NaPN)2), which are the derivatives of bis(dipyrrinato)zinc complex, were successfully synthesized.The optical properties of the synthesized compounds were measured through UV-visible and PL spectrum. UV-visible maximum values in solution state, 485 and 486 nm for Zn(1-NaPN)2 and Zn(2-NaPN)2 have similar absorption maximum value and PL spectrum maximum values are 516 and 518 nm, respectively. In the film state, UV-visible maximum values, about 517 nm for both compounds, also indicated absorption of similar wavelengths. PL spectrum was shown to be about 550 nm which is also red-shifted about 33 nm from the solution state, moving toward yellowish green color.Zn(1-NaPN)2 and Zn(2-NaPN)2, the synthesized compounds, were measured on electrochemical kinetic properties through cyclic voltammogram (CV), and both materials showed similar oxidation voltage of about 0.7 V (vs. Ag/AgNO3). The exponent of scan rate and x-value of Zn(1-NaPN)2 and Zn(2-NaPN)2 were 0.52 and 0.33, so the kinetics of Zn(1-NaPN)2 is mainly controlled by diffusion process.