Luminescent Organometallic Complexes Built upon the Nonemissive Azophenine
| Autor: | Daniel Fortin, Pierre D. Harvey, Paul-Ludovic Karsenti, Hu Lei, Shawkat M. Aly |
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| Rok vydání: | 2017 |
| Předmět: |
Range (particle radiation)
010405 organic chemistry Chemistry Organic Chemistry Charge (physics) 010402 general chemistry 01 natural sciences Fluorescence 0104 chemical sciences 3. Good health Inorganic Chemistry Crystallography Computational chemistry Excited state Singlet state Physical and Theoretical Chemistry Absorption (chemistry) Phosphorescence Luminescence |
| Zdroj: | Organometallics. 36:572-581 |
| ISSN: | 1520-6041 0276-7333 |
| Popis: | Azophenine, C6H2(═NPh)2(NHPh)2, is renowned to be nonemissive in solution or in the solid state at 298 and 77 K. It was rendered luminescent in solution at room temperature without using any cyclization strategy of the N∧N end by anchoring two or four trans-RC≡CPt(PBu3)2(C≡C) units (R = hexa-n-hexyltruxene (Tru)) on the azophenine. Complexes of the general formulas C6H2(═NC6H4C≡CSiMe3)2(NHPtTru)2 (DiPtTruQ) and C6H2(═NPtTru)2(NHPtTru)2(TertPtTruQ), where Pt = trans-C6H4C≡CPt(PBu3)2C≡C, exhibit fluorescence (420 nm) and phosphorescence (512 nm) bands arising from upper localized ππ*/C6H4C≡C to TruC≡C charge transfer singlet and triplet excited states in 2MeTHF at 298 and 77 K. This latter assignment is based on DFT computations (B3LYP). Moreover, DiPtTru and TertPtTru exhibit low-energy absorption bands with maxima in the 470–485 nm range extending all the way to 600–650 nm. These spectral features are associated with charge transfer (CT) excited states: namely, TruPt → Q (Q = C6H2N2(NH)2). No emission ban... |
| Databáze: | OpenAIRE |
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