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Effect of Gold(I) on the Room-Temperature Phosphorescence of Ethynylphenanthrene |
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| Authors: | Araceli de Aquino Dr Francisco J Caparrós Prof Gabriel Aullón Dr Jas S Ward Prof Kari Rissanen Dr Yongsik Jung Dr Hyeonho Choi Prof João Carlos Lima Prof Laura Rodríguez |
| Institution: | 1. Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain
These authors contributed equally to this work.;2. Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain These authors contributed equally to this work.;3. Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, 08028 Barcelona, Spain;4. Department of Chemistry, University of Jyväskylä, P.O. Box 35, 40014 Jyväskylä, Finland;5. Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16678 Republic of Korea;6. LAQV-REQUIMTE, Departamento de Química, Universidade Nova de Lisboa, 2829-516 Monte de Caparica, Spain;7. Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain |
| Abstract: | The synthesis of two series of gold(I) complexes with the general formulae PR3-Au-C≡C-phenanthrene (PR3=PPh3 ( 1 a / 2 a ), PMe3 ( 1 b / 2 b ), PNaph3 ( 1 c / 2 c )) or (diphos)(Au-C≡C-phenanthrene)2 (diphos=1,1-bis(diphenylphosphino)methane, dppm ( 1 d / 2 d ), 1,4-bis(diphenylphosphino)butane, dppb ( 1 e / 2 e )) has been realized. The two series differ in the position of the alkynyl substituent on the phenanthrene chromophore, being at the 9-position (9-ethynylphenanthrene) for the L1 series and at the 2-position (2-ethynylphenanthrene) for the L2 series. The compounds have been fully characterized by 1H, 31P NMR, and IR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction resolution in the case of compounds 1 a , 1 e , 2 a , and 2 c . The emissive properties of the uncoordinated ligands and corresponding complexes have been studied in solution and within organic matrixes of different polarity (polymethylmethacrylate and Zeonex). Room-temperature phosphorescence (RTP) is observed for all gold(I) complexes whereas only fluorescence can be detected for the pure organic chromophore. In particular, the L2 series presents better luminescent properties regarding the intensity of emission, quantum yields, and RTP effect. Additionally, although the inclusion of all the compounds in organic matrixes induces an enhancement of the observed RTP owing to the decrease in non-radiative deactivation, only the L2 series completely suppresses the fluorescence, giving rise to pure phosphorescent materials. |
| Keywords: | gold heavy atom effect organic matrixes phenanthrene phosphorescence |