Abstract
n this work, we present synthesis of the compounds trans-[Ru(NH3)4L(bpa)]2+ where L is pyridine ligands: pyridine (py), isonicotinamide (isn), 4-acetylpyridine (4-acpy) and 4-picoline (4-pic) and 1,2-bis (4-pyridyl) ethane (bpa), their characterization by UV-visible spectroscopy and electrochemical properties. This series shows intense bands in the region between 400 and 515 nm, allocated bands charge transfer (MLCT), the influence of substituents on the pyridine ring (4-acpy and isn), and the interaction between the ligand and the metal, causing a second MLCT band, which is lighter and has more energy. The compound is characterized by spectroscopy by Fourier transform infrared spectroscopy (FTIR). The displacement observed in the symmetrical stretching of νs(CCN) group in the complex compared with the νs(CCN) group in the free ligand is indicative of coordination of the pyridine group to the Ruthenium (II) metallic center. The electrochemical data (cyclic voltammetry) show that reversibility criteria are well defined and formal Ef potential, indicating the influence of the pyridine ring substituent.
Highlights
IntroductionWork with the amines ruthenium (II) and (III) has been further developed in different areas, such
In recent years, work with the amines ruthenium (II) and (III) has been further developed in different areas, suchHow to cite this paper: dos Santos, W.B., Chagas, M.A.S., de Sousa, K.M.D., Costa, D.T. and Pavanin, L.A. (2016) Synthesis, Characterization, Spectral Properties and Electrochemical of Compounds trans-[Ru(NH3)L(bpa)]2+
It can be observed that the bands at 319 nm, 424 nm and 520 nm are characteristic of the compound trans-[Ru(NH3)4SO2L’]2+, where L = py converged to only one band at 422 nm with the addition of bpa ligand; this may be attributed to the replacement process of bpa to the SO2 ligand
Summary
Work with the amines ruthenium (II) and (III) has been further developed in different areas, such. Studies conducted by Lim et al [16] and Matsubara et al [17] with amines of ruthenium have shown that the change of a molecule of ammonia in [Ru(NH3)6]+3/+2 or water in [Ru(NH3)5H2O]+3/+2, by an unsaturated ligand L, such as pyridines caused an increase in the value of the formal potential (Ef), for the compound. Chatt et al [18] observe the effect of the ligands on the metal atom, similar to that observed for aromatic compounds using cyclic voltammetry These studies show that the higher the reception capability of electrons π is allied to the smaller capacity σ of ligand L, the greater the value of the formal charge Ef will be. This work presents the synthesis, and spectroscopic and electrochemical properties, highlighting the influence of the substituent on the pyridine ring binder, in the charge transfer bands, and in the formal potential and reversibility criteria presented by the synthesized compounds
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