Synthesis, structures, luminescence and terahertz time-domain spectroscopy of nine Cu(I) complexes with P^P ligands and 1,10-phenanthroline derivatives

Add time:09/28/2019    Source:sciencedirect.com

Nine new copper(I) complexes bearing 1,3-bis(diphenylphosphino)propane (dppp) and 4,7-diphenyl-1,10-phenanthroline (batho) or 2,9-dimethyl-1,10-phenanthroline (neo) have been synthesized and characterized. Single crystal X-ray diffraction analysis reveals that complexes 1–4 and 6–9 are mononuclear with similar structures, while complex 5 is a binuclear structure. They display absorption around 280 nm and 410 nm, and the intensive emission in the range of 520–620 nm in the solid state occurring with lifetimes on the μs timescale indicates phosphorescence. Our TD-DFT calculations show that emission from the lowest excited triplet state T1 is of 3MLCT nature. This study manifests that these simple and long-lifetime Cu(I) systems may exhibit a similar, but more complex excited state behavior than the systems previously appreciated.

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