Oxygen-insensitive phosphorescence in water from a Pt-doped supramolecular array

Straub, Laura; Gonzalez-Abradelo, Dario; Strassert, Cristian A.

doi:10.1039/c7cc05435a

Cited by 13 publications

(10 citation statements)

References 24 publications

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“…45–47 The combination of macrocyclic hosts and modified guests can bring the following benefits to purely organic RTP: (1) the rigid environment of macrocyclic compounds can tightly bind the guest, limit its molecular vibration, and reduce the nonradiative transition of the triplet state; 48,49 (2) the hydrophobic cavity can protect the wrapped phosphor from the quenching effect of the external oxygen, water and other impurities. 50,51 Based on the above advantages, many efforts have contributed to the application of supramolecular macrocycles in purely organic RTP systems. 52–54 Tian and co-workers reported an approach to achieve amorphous purely organic RTP small molecules by modifying different phosphors onto β-cyclodextrin, which could suppress the non-radiative relaxation via intermolecular hydrogen bonding.…”

Section: Introductionmentioning

confidence: 99%

A tunable phosphorescence supramolecular switch by an anthracene photoreaction in aqueous solution

Liu

Chen

et al. 2022

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

A tunable phosphorescence supramolecular switch by an anthracene photoreaction in aqueous solution

Liu

Chen

et al. 2022

J. Mater. Chem. C

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“…We have previously observed that metal–metal interactions between Pt(II) complexes self-assembling into phosphorescent fibers, gels, and polymers result in supramolecular arrays with reduced diffusion-controlled collisional quenching by 3 O 2 . − Moreover, 3 O 2 insensitivity can be attained through sophisticated synthetic strategies by covalently loading Pt(II) complexes into polymeric nanostructures acting simultaneously as luminescent reporters for optical microscopy and as contrast agents for electron microscopy . Interestingly, both aqueous solubility and 3 O 2 insensitivity can be also achieved employing layered nanoclays such as Laponite ( LAP ) as carriers for phosphorescent species …”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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“…24 Recently, we have shown that the supramolecular polymeric arrays doped with Pt(II) complexes can be dispersed in aqueous environments without diffusional quenching by molecular oxygen. 25 In this paper, we describe a new tailored Pt(II) complex that does not emit as a monomer even in the absence of oxygen but is able to form phosphorescent aggregates that show no Pt−Pt interaction while being insensitive to quenching by molecular oxygen (Scheme 1). We investigated its capability for time-gated detection by inducing a controlled aggregation on a…”

Section: ■ Introductionmentioning

confidence: 99%

Oxygen-Insensitive Aggregates of Pt(II) Complexes as Phosphorescent Labels of Proteins with Luminescence Lifetime-Based Readouts

Delcanale

Galstyan

Daniliuc

et al. 2018

ACS Appl. Mater. Interfaces

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The synthesis and photophysical properties of a tailored Pt(II) complex are presented. The phosphorescence of its monomeric species in homogeneous solutions is quenched by interaction with the solvent and therefore absent even upon deoxygenation. However, aggregation-induced shielding from the environment and suppression of rotovibrational degrees of freedom trigger a phosphorescence turn-on that is not suppressed by molecular oxygen, despite possessing an excited-state lifetime ranging in the microsecond scale. Thus, the photoinduced production of reactive oxygen species is avoided by the suppression of diffusion-controlled Dexter-type energy transfer to triplet molecular oxygen. These aggregates emit with the characteristic green luminescence profile of monomeric complexes, indicating that Pt-Pt or excimeric interactions are negligible. Herein, we show that these aggregates can be used to label a model biomolecule (bovine serum albumin) with a microsecond-range luminescence. The protein stabilizes the aggregates, acting as a carrier in aqueous environments. Despite spectral overlaps, the green phosphorescence can be separated by time-gated detection from the dominant autofluorescence of the protein arising from a covalently bound green fluorophore that emits in the nanosecond range. Interestingly, the aggregates also acted as energy donors able to sensitize the emission of a fraction of the fluorophores bound to the protein. This resulted in a microsecond-range luminescence of the fluorescent acceptors and a shortening of the excited-state lifetime of the phosphorescent aggregates. The process that can be traced by a 1000-fold increase in the acceptor's lifetime mirrors the donor's triplet character. The implications for phosphorescence lifetime imaging are discussed.

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Oxygen-insensitive phosphorescence in water from a Pt-doped supramolecular array

Cited by 13 publications

References 24 publications

A tunable phosphorescence supramolecular switch by an anthracene photoreaction in aqueous solution

A tunable phosphorescence supramolecular switch by an anthracene photoreaction in aqueous solution

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

Oxygen-Insensitive Aggregates of Pt(II) Complexes as Phosphorescent Labels of Proteins with Luminescence Lifetime-Based Readouts

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