Premium
Effect of Gold(I) on the Room‐Temperature Phosphorescence of Ethynylphenanthrene
Author(s) -
Aquino Araceli,
Caparrós Francisco J.,
Aullón Gabriel,
Ward Jas S.,
Rissanen Kari,
Jung Yongsik,
Choi Hyeonho,
Lima João Carlos,
Rodríguez Laura
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004051
Subject(s) - phosphorescence , phenanthrene , chemistry , chromophore , substituent , luminescence , photochemistry , fluorescence , stereochemistry , materials science , organic chemistry , physics , optoelectronics , quantum mechanics
The synthesis of two series of gold(I) complexes with the general formulae PR 3 ‐Au‐C≡C‐phenanthrene (PR 3 =PPh 3 ( 1 a / 2 a ), PMe 3 ( 1 b / 2 b ), PNaph 3 ( 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 1 H, 31 P 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.