Water-soluble hollow nanocrystals from self-assembly of AIEE-active Pt(II) metallomesogens

Luminescent hollow micro- and nanocrystals have been successfully obtained taking advantage of the self-assembly behavior and the aggregation-induced emission enhancement properties of several bispyrazolate Pt(II) metallomesogens decorated with four terminal alkyl chains. Oil-in-water droplets have...

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Bibliographic Details
Published in:Nano research 2021, Vol.14 (1), p.245-254
Main Authors: Cuerva, Cristián, Fernández-Lodeiro, Javier, Cano, Mercedes, Capelo-Martínez, José Luis, Lodeiro, Carlos
Format: Article
Language:English
Subjects:
Aggregation behavior
Atomic/Molecular Structure and Spectra
Biomedical materials
Biomedicine
Biotechnology
Chains
Chemistry and Materials Science
Condensed Matter Physics
Crystals
Dispersions
Droplets
Evaporation
Hydrophobicity
Liquid crystals
Materials Science
Nanocrystals
Nanotechnology
Polydispersity
Research Article
Self-assembly
Water drops
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Summary:Luminescent hollow micro- and nanocrystals have been successfully obtained taking advantage of the self-assembly behavior and the aggregation-induced emission enhancement properties of several bispyrazolate Pt(II) metallomesogens decorated with four terminal alkyl chains. Oil-in-water droplets have been used to confine the Pt(II) compounds and drive them to be self-assembled via intermolecular Pt···Pt interactions into spherical aggregates of about 200 or 50 nm. Evaporation of the oil phase generates highly-stable aqueous dispersions of nanocrystals that emit a bright orange light as a result of the existence of 3 MMLCT excited states. Different methods and conditions have been tested for studying the effect of several parameters such as the temperature and the stirring speed in the final particle size and in the polydispersity index. Moreover, the micro- and nanocrystals are able to entrap hydrophobic drugs between the alkyl chains of the compounds, forming stable dispersions of drug-loaded capsules in water. The droplet method is applied in the area of metallomesogens for the first time to synthesize self-assembled Pt(II) nanocapsules, which opens a new field of study that could allow the use of these liquid crystal materials in biomedical applications.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-3078-0