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Enhanced Stability and Emission Properties of Perylene Dyes by Surface Tethering: Preparation of Fluorescent Ru Nanoparticle Suspensions by Alkyne Linker Chemistry
Author(s) -
Morais Eduardo,
Moloney Cara,
O'Modhrain Colin,
McKiernan Eoin,
Brougham Dermot F.,
Sullivan James A.
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.202003514
Subject(s) - fluorescence , perylene , photochemistry , nanoparticle , absorption (acoustics) , ruthenium , alkyne , materials science , chemistry , chemical engineering , catalysis , nanotechnology , organic chemistry , molecule , physics , quantum mechanics , engineering , composite material
Spherical ruthenium nanoparticles (NPs) with a narrow size distribution were synthesised in ethanol by a facile low‐temperature solvothermal process without the assistance of templates, structure‐directing agents or post annealing/reduction treatments. Surface passivation with a fluorescent perylene dye (EP), and with silane ligands (ETMS), both initially bearing alkyne groups and subsequently forming vinylidene linkages, provided stable suspensions of the marginally soluble free EP. Quantitative analysis of the suspension gave an estimated EP surface coverage of 15 %, corresponding to an EP/ETMS mole ratio of ≈1:6. Photophysical evaluation of the bound and free dye revealed similar absorption bands and extinction coefficients and improved properties for the bound state, including enhanced fluorescence in the visible range for the bound dye, an extended absorption range into the near‐UV providing strong emission in the visible, and significantly improved photostability. The physical basis of the enhanced photophysical properties, potential routes to further improvements and the implications for applications are discussed.