Copper(I) binap complexes (binap = (2,2′-bis(diphenylphosphino)-1,1′-binaphthyl). Luminescence from IL and LLCT states

• Published in: Inorganic chemistry communications 2008-09, Vol.11 (9), p.1003-1005
• Main Authors: Kunkely, Horst, Pawlowski, Valeri, Vogler, Arnd
• Format: Article
• Language: English
• Subjects: Copper(I); Fluorescence; LLCT; Phosphine complexes; Phosphorescence
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2008.05.004

The preparation and the r.t. luminescence of the complexes [Cu(binap) 2] + and [Cu(binap)I] 2 with binap = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl are reported. The lowest-energy excited state of [Cu(binap) 2] + is an IL ππ ∗ state of the binaphthyl chromophore. The luminescence of the cation consists of a fluorescence and a phosphorescence originating from this IL state. In contrast, the dimer [Cu(binap)I] 2 is characterized by a I − → binap LLCT state which occurs at lower energies than the binap IL state. The dimer shows only a single emission band. This luminescence is suggested to come from the LLCT triplet. The preparation and the r.t. luminescence of the complexes [Cu(binap) 2] + and [Cu(binap)I] 2 with binap = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl are reported. The lowest-energy excited state of [Cu(binap) 2] + is an IL ππ∗ state of the binaphthyl chromophore. The luminescence of the cation consists of a fluorescence and a phosphorescence originating from this IL state. In contrast, the dimer [Cu(binap)I] 2 is characterized by a I − → binap LLCT state which occurs at lower energies than the binap IL state. The dimer shows only a single emission band. This luminescence is suggested to come from the LLCT triplet.