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Luminescence of Amphiphilic Pt II Complexes Controlled by Confinement
Author(s) -
Atoini Youssef,
Prasetyanto Eko Adi,
Chen Pengkun,
Silvestrini Simone,
Harrowfield Jack,
De Cola Luisa
Publication year - 2018
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.201802743
Subject(s) - supramolecular chemistry , luminescence , mesoporous silica , photoluminescence , amphiphile , nanoparticle , hybrid material , nanomaterials , quantum dot , materials science , self assembly , moiety , platinum nanoparticles , chemical engineering , excited state , nanotechnology , photochemistry , platinum , mesoporous material , chemistry , copolymer , molecule , organic chemistry , catalysis , optoelectronics , polymer , physics , nuclear physics , engineering , composite material
The formation of hybrid silica‐based systems to study the effect of the confinement on the emission properties of self‐assembled platinum(II) complexes is reported. The complexes behave as surfactants since they possess a hydrophobic moiety and, on the ancillary ligand, a relatively long hydrophilic chain terminated with a positively charged group. The compounds, soluble in water, self‐assemble, even at very low concentration, in supramolecular structures which display an orange luminescence. The properties of the assemblies have been studied in detail and in order to stabilize these supramolecular architectures and to enhance their emission properties hybrid silica porous nanoparticles have been prepared. In particular the Pt II complexes have been employed as co‐surfactant for the template formation of mesoporous silica nanoparticles (MSNs) using a sol gel synthesis. Interestingly, upon encapsulation in the silica pores, the platinum aggregates exhibit an emission profile similar in energy to the complexes assembled in solution, but the photoluminescence quantum yields of the hybrid systems are significantly higher (up to 45 %), and the excited state lifetimes much longer than those recorded in solution. Such enhancement of the photophysical properties together with the possibility to process the hybrid silica nanomaterials can pave the way to new type of emitters.