Abstract
Two series of bidentate polypyridine ligands, made of phenanthroline chelating subunits having substituted mono-and di-anthracenyl groups, and 1-methoxy-1-buten-3-yne at the 4 and 7-positions with the corresponding heteroleptic Ru(II) complex have been synthesized and characterized. The complex is formulated as [(Ru(L1)(L2)(NCS)2)], (where L1 = 4-(9-dianthracenyl-10-(2,3-dimethylacrylic acid)-7-(9-anthracenyl-10-(2,3-dimethylacrylic acid)-1,10-phenanthroline and L2 = 4,7-bis(1-methoxy-1-buten-3-yne)-1,10-phenanthroline). The Ru(II) complex shows characteristic broad and intense metal-to-ligand charge transfer (MLCT) bands absorption and appreciable photoluminescence spanning the visible region. The ligands and complex were characterized by FT-IR, 1H, 13C NMR spectroscopy, UV-Vis, photoluminescence and elemental analysis (see in supplementary materials). The anchoring groups in both ligands have allowed an extended delocalization of acceptor orbital of the metal-to-ligand charge-transfer (MLCT) excited state.
Highlights
Coordination chemistry is about the influence of the ligands on the chemical properties of metal ions
We report the synthesis of a heteroleptic ruthenium(II) phenanthroline complex
The strategy adopted is in line with the continuation of the efforts geared towards the synthesis of ruthenium(II) complex sensitizers that may be used in energy and electron transfer processes, dendrimers for light harvesting and lightpowered molecular machine
Summary
Coordination chemistry is about the influence of the ligands on the chemical properties of metal ions. Tuning the optical properties of transition metal complexes by ligand tailoring has been a fascinating research field which has generated highly coloured pigments, very efficient triplet energy and electron transfer reactions, long-lived excited states, charge separated species, and singlet oxygen producers [2]. Along these lines, polyaromatic modified bipyridines, and phenanthrolines have extensively been studied and interesting features connected to lifetime enhancement from the excited state manifold has been reported. The strategy adopted is in line with the continuation of the efforts geared towards the synthesis of ruthenium(II) complex sensitizers that may be used in energy and electron transfer processes, dendrimers for light harvesting and lightpowered molecular machine
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