Luminescent tetranuclear gold(I) dibenzo[g,p]chrysene derivatives. Effect of the environment on the photophysical properties
Journal
Molecules
Date
2020.02.20
Abstract
A new 2,7,10,15 tetraethynyldibenzo[g,p]chrysene ligand (1) and two tetranuclear gold(I) derivatives containing PPh3 (3) and PMe3 (4) phosphines have been synthesized and characterized by 1H and 31P NMR, IR spectroscopy and high resolution mass spectrometry. The compounds have been studied in order to analyze the effect of the introduction gold(I) in the supramolecular aggregation and photophysical properties. Absorption and emission spectra display broad bands due to the establishment of π-π interactions as an indication of intermolecular contacts and formation of aggregates. A decrease on the recorded quantum yield (QY) of the gold(I) derivatives was observed with respect to the uncomplexed ligand. The introduction of the complexes in PMMA and Zeonex matrices was analyzed and it could be observed and increase of the measured QY of 4 in Zeonex. No phosphorescent emission was detected.