Abstract
Three 1,1′-disubstituted 4,4′-bi-1H-1,2,3-triazols [R-bta; R = Bn (1), Ph (2), CH2COOH (3)] have been synthesised as bidentate, nitrogen-based ligands by a CuI-catalysed “click” reaction between 1,3-butadiyne and organic azides. Their ligand properties were investigated by preparation of the complexes [RuII(R-bta)3]Cl2 [R = Bn (4), Ph (5), CH2COOH (6)], [(Bn-bta)CuI(DPEPhos)] (7) [DPEPhos = ...
Abstract
Three 1,1′-disubstituted 4,4′-bi-1H-1,2,3-triazols [R-bta; R = Bn (1), Ph (2), CH2COOH (3)] have been synthesised as bidentate, nitrogen-based ligands by a CuI-catalysed “click” reaction between 1,3-butadiyne and organic azides. Their ligand properties were investigated by preparation of the complexes [RuII(R-bta)3]Cl2 [R = Bn (4), Ph (5), CH2COOH (6)], [(Bn-bta)CuI(DPEPhos)] (7) [DPEPhos = bis{2-(diphenylphosphanyl)phenyl} ether] and [(Bn-bta)ReI(CO)3Cl] (8) following standard reaction procedures. All compounds were analysed by elemental analysis, mass spectrometry and NMR, IR, UV/Vis and luminescence spectroscopy. In addition, the molecular structures of 1–4, 7, and 8 have been determined by X-ray crystallography. In all complexes the Bn-bta acts as a bidentate ligand with structural features comparable to the analogous 2,2′-bipyridine complexes. In their electronic absorption spectra the RuII and ReI complexes exhibit a lowest energy band at around 300 nm, which is substantially higher in energy than in analogous complexes with bpy ligands. All R-bta ligands yield complexes that are not luminescent in solution or in the solid state, which makes these ligands particularly suited for use as spectator ligands.
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