A new approach to the effects of isocyanide (CN-R) ligands on the luminescence properties of cycloplatinated(ii) complexes. (21st November 2017)

• Record Type: Journal Article
• Authors: Shahsavari, Hamid R.; Babadi Aghakhanpour, Reza; Hossein-Abadi, Mojdeh; Golbon Haghighi, Mohsen; Notash, Behrouz; Fereidoonnezhad, Masood
• Is Part Of: New journal of chemistry. Volume 41:Number 24(2017)
• Page Start: 15347
• Page End: 15356
• Publication Date: 2017-11-21
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj03110f
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Cycloplatinated complexes bearing isocyanides were prepared and characterized. The complexes exhibited strong luminescence while the nature of R substituents in isocyanides affected the luminescence characteristics. Abstract : The present investigation highlights the effects of the presence of isocyanide ligands on the emission properties of cycloplatinated(ii ) compounds. The new complexes with a general formula of [Pt(ppy)(Me)(CN-R)] (ppy = deprotonated 2-phenylpyridine and R = benzyl (1 ), 2-naphthyl (2 ), tert -butyl (3 )) were produced using a quite simple method. Then, the resulting complexes were accurately identified employing multinuclear 1D and 2D NMR spectroscopy and two of them (1 and3 ) were further authenticated by single crystal X-ray crystallography. The optical properties of1–3 were investigated by UV-visible and photoluminescence spectroscopy. The obtained photophysical data were supported by density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations. The concurrent presence of Me and isocyanide ligands as two strong carbon σ-donor ancillary ligands in the structure of these cycloplatinated(ii ) complexes was probably responsible for the strong luminescence observed at room temperature. This was confirmed by the obtained relatively high quantum yield values (0.41, 0.56 and 0.40 for1, 2 and3, respectively). The luminescence investigation of the complexes under different conditions indicates that R substituents in the structures of isocyanide ligands have a remarkable influence on the emission properties.