Intermolecular Interactions and Self-Assembly in Pt(II) Complex–Nanoclay Hybrids as Luminescent Reporters for Spectrally Resolved PLIM

Chatnahalli Gangadharappa, S.; Maisuls, I.; Salto, I. P.; Niemann, S.; Bachtin, V.; Herrmann, F. C.; Strassert. C. A.

Research article (journal)

Abstract

Efficient shielding of phosphorescent transition metal complexes against diffusion-controlled collisional quenching by triplet molecular dioxygen as well as reduction of microenvironment-related radiationless deactivation pathways is crucial for their applications in bioimaging and optoelectronics. In this report, we present a straightforward yet efficient approach to safeguard emissive triplet states from external influences by adsorbing phosphorescent Pt(II) complexes onto a layered nanoclay, namely Laponite. These hybrids facilitate the dispersion of otherwise insoluble transition metal complexes in aqueous media while shielding them from physical quenching. Self-assembly of the nanoclay and intermolecular stacking between molecules adsorbed at different nanodisc units are mirrored in the photophysical, colloidal, and morphological properties of the hybrids, which were herein characterized by steady-state and time-resolved photoluminescence spectroscopy, dynamic light scattering, and atomic force microscopy. We also show that the hybrids are noncytotoxic and can be exploited as luminescent reporters in spectrally resolved phosphorescence lifetime imaging implemented by confocal optical microscopy.

Details zur Publikation

Publisher:
Release year: 2021
Publishing company: American Chemical Society
Language in which the publication is written: English
Link to the full text: https://doi.org/10.1021/acs.jpcc.0c09835