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Research Article

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

Cristián Cuerva1( ), Javier Fernández-Lodeiro1,2, Mercedes Cano3, José Luis Capelo-Martínez1,2, Carlos Lodeiro1,2( )
BIOSCOPE Research Group, LAQV@REQUIMTE Chemistry Department, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
PROTEOMASS Scientific Society, Rua dos Inventores, Madam Parque, Caparica Campus, 2829-516 Caparica, Portugal
Department of Inorganic Chemistry, Complutense University of Madrid, Ciudad Universitaria, 28040 Madrid, Spain
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Graphical Abstract

Abstract

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 3MMLCT 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.

Keywords

self-assemblynanocapsulesdropletsPt(II) metallomesogensluminescent nanomaterials

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Nano Research
Volume 14 Issue 1,
January 2021
Pages 245-254
DOI: 10.1007/s12274-020-3078-0
Cite this article:
Cuerva C, Fernández-Lodeiro J, Cano M, et al. Water-soluble hollow nanocrystals from self-assembly of AIEE-active Pt(II) metallomesogens. Nano Research, 2021, 14(1): 245-254. https://doi.org/10.1007/s12274-020-3078-0
Topics:
Liquid crystals Medical applicationsNanocrystalsParticle sizePlatinum compoundsSelf assembly

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Received: 08 June 2020
Revised: 27 August 2020
Accepted: 27 August 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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