Abstract
A tricarbonyl Re(I) phenanthroline complex (1) with anionic cyanopentafluorophosphate [NCPF5]– ligand has been synthesized and characterized. Although the structure of the complex has also been determined by X-ray crystallography, the identity of the [NCPF5]– needs to be confirmed by the vibrational spectroscopic study. The cyanopentafluorophosphate Re(I) phenanthroline complex 1 also exhibits phosphorescence derived from a 3MLCT excited state. Importantly, as the MLCT absorption and emission energies of 1 are comparable to those of the structurally related complexes with the strongest π-accepting anionic isocyanoborate ligands, it reveals the exceptionally strong π-accepting ability of [NCPF5]–. This result suggests that [NCPF5]– is a promising alternative to isocyanoborate ligands for designing phosphorescent materials, catalysts and photocatalysts.
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