Synthesis, Photophysical and Electrochemical Properties of a Mixed Bipyridyl-Phenanthrolyl Ligand Ru(II) Heteroleptic Complex Having trans-2-Methyl-2-butenoic Acid Functionalities

Molecules

关键词: mixed-ligand Ru(II) complex;    extended-π-bond conjugation;    spectroscopy;    molar extinction coefficient;    electrochemistry;   

DOI  :  10.3390/molecules16108353

来源: mdpi

【 摘 要 】

In this work, two ligands: 4-(trans-2-Methyl-2-butenoic acid)-2,2'-bipyridine) (L₁) and 5-(trans-2-methyl-2-butenoic acid)-1,10-phenanthroline (L₂), with the corresponding mixed-ligand heteroleptic Ru(II) complex were synthesized and characterized by FT-IR, ¹H-, ¹³C-NMR spectroscopy and elemental analysis. The influence of the mixed functionalized polypyridyl ruthenium(II) complex on the photophysical and electrochemical properties were investigated and compared to individual single-ligand homoleptic complexes. Interestingly, the mixed-ligand complex formulated as [RuL₁L₂(NCS)₂] exhibits broad and intense metal-to-ligand charge transfer (MLCT) absorption with a high molar extinction coefficient (λ_max = 514 nm, ε = 69,700 M⁻¹ cm⁻¹), better than those of individual single-ligand complexes, [Ru(L₁)₂(NCS)₂] and [Ru(L₂)₂(NCS)₂], and a strong photoluminescence intensity ratio in the red region at λ_em = 686 nm. The electrochemical properties of the complex indicated that the redox processes are ligand-based.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.