Very intense polarized emission in self-assembled room temperature metallomesogens based on Zn(<scp>ii</scp>) coordination complexes: an experimental and computational study

Deda, Massimo La; Maio, Giuseppe Di; Candreva, Angela; Heinrich, Benoît; Andelescu, Adelina A.; Popa, Evelyn; Voirin, Emilie; Badea, Valentin; Amati, Mario; Costişor, Otilia; Donnio, Bertrand; Szerb, Elisabeta I.

doi:10.1039/d1tc05059a

Cited by 12 publications

(23 citation statements)

References 61 publications

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“…Fluorescent and light-emitting large, π-conjugated DLCs still attract the interest of scientists not only for academic reasons but also for their potential applications and uses in OLEDs, biological probes, chemical sensors, stimuli responses and circularly polarized light-emitting materials. 47–54 Large aromatic systems containing pyrene ( PY 8) and tetraphenylethene ( TPE 8) are particularly important as potential fluorescent and aggregate-induced light-emitting functional materials, respectively. 55…”

Section: Resultsmentioning

confidence: 99%

“…Fluorescent and light-emitting large, p-conjugated DLCs still attract the interest of scientists not only for academic reasons but also for their potential applications and uses in OLEDs, biological probes, chemical sensors, stimuli responses and circularly polarized light-emitting materials. [47][48][49][50][51][52][53][54] Large aromatic systems containing pyrene (PY8) and tetraphenylethene (TPE8) are particularly important as potential fluorescent and aggregateinduced light-emitting functional materials, respectively. 55 The UV-Vis absorption and fluorescence emission of the synthesized molecules were studied in both dilute solutions and in thin films (emission) to understand the effects of the pconjugation extension, intermolecular interactions and coplanarity on the optical properties.…”

Section: Uv-vis Absorption and Fluorescence Emissionmentioning

confidence: 99%

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2-Aryl-1,3,4-trifluoro-6,7,10,11-tetrakis(alkoxy)triphenylene: a remarkable and highly inclusive mesomorphic platform

Pan,

He,

et al. 2023

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

Section: Uv-vis Absorption and Fluorescence Emissionmentioning

confidence: 99%

2-Aryl-1,3,4-trifluoro-6,7,10,11-tetrakis(alkoxy)triphenylene: a remarkable and highly inclusive mesomorphic platform

Pan,

He,

et al. 2023

J. Mater. Chem. C

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“…This is partly due to the facility of changing organizations of the metal centers at room temperature by controlling the type and symmetry of the mesophases, which template the structuration at room temperature. Finally, the ability of the amphiphilic Zn(II) complex to self-assemble into different symmetry liquid crystalline phases as a function of the functionalities grafted on the tpy ligand [ 44 ], likely enables further studies of relevance for structure-related electrochemical properties.…”

Section: Discussionmentioning

confidence: 99%

Design of Nanostructured Hybrid Electrodes Based on a Liquid Crystalline Zn(II) Coordination Complex-Carbon Nanotubes Composition for the Specific Electrochemical Sensing of Uric Acid

et al. 2022

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A metallomesogen based on an Zn(II) coordination complex was employed as precursor to obtain a complex matrix nanoplatform for the fabrication of a high-performance electrochemical hybrid sensor. Three representative paste electrodes, which differ by the weight ratio between Zn(II) metallomesogen and carbon nanotubes (CNT), i.e., PE_01, PE_02 and PE_03, were obtained by mixing the materials in different amounts. The composition with the largest amount of CNT with respect to Zn complex, i.e., PE_03, gives the best electrochemical signal for uric acid detection by cyclic voltammetry in an alkaline medium. The amphiphilic structure of the Zn(II) coordination complex likely induces a regular separation between the metal centers favoring the redox system through their reduction, followed by stripping, and is characterized by enhanced electrocatalytic activity towards uric acid oxidation. The comparative detection of uric acid between the PE_03 paste electrode and the commercial zinc electrode demonstrated the superiority of the former, and its great potential for the development of advanced electrochemical detection of uric acid. Advanced electrochemical techniques, such as differential-pulsed voltammetry (DPV) and square-wave voltammetry (SWV), allowed for the highly sensitive detection of uric acid in aqueous alkaline solutions. In addition, a good and fast amperometric signal for uric acid detection was achieved by multiple-pulsed amperometry, which was validated by urine analysis.

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“…Photophysical characterization. Perkin Elmer Lambda 900 spectrophotometer was employed to obtain the absorption spectra [ 78 , 79 , 80 ]. An amount of 3 mL of the nanoparticle dispersion was transferred from the reaction flask to a quartz cuvette to carry out the measurement.…”

Section: Methodsmentioning

confidence: 99%

Light-Induced Clusterization of Gold Nanoparticles: A New Photo-Triggered Antibacterial against E. coli Proliferation

et al. 2023

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Metallic nanoparticles show plasmon resonance phenomena when irradiated with electromagnetic radiation of a suitable wavelength, whose value depends on their composition, size, and shape. The damping of the surface electron oscillation causes a release of heat, which causes a large increase in local temperature. Furthermore, this increase is enhanced when nanoparticle aggregation phenomena occur. Local temperature increase is extensively exploited in photothermal therapy, where light is used to induce cellular damage. To activate the plasmon in the visible range, we synthesized 50 nm diameter spherical gold nanoparticles (AuNP) coated with polyethylene glycol and administered them to an E. coli culture. The experiments were carried out, at different gold nanoparticle concentrations, in the dark and under irradiation. In both cases, the nanoparticles penetrated the bacterial wall, but a different toxic effect was observed; while in the dark we observed an inhibition of bacterial growth of 46%, at the same concentration, under irradiation, we observed a bactericidal effect (99% growth inhibition). Photothermal measurements and SEM observations allowed us to conclude that the extraordinary effect is due to the formation, at low concentrations, of a light-induced cluster of gold nanoparticles, which does not form in the absence of bacteria, leading us to the conclusion that the bacterium wall catalyzes the formation of these clusters which are ultimately responsible for the significant increase in the measured temperature and cause of the bactericidal effect. This photothermal effect is achieved by low-power irradiation and only in the presence of the pathogen: in its absence, the lack of gold nanoparticles clustering does not lead to any phototoxic effect. Therefore, it may represent a proof of concept of an innovative nanoscale pathogen responsive system against bacterial infections.

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Very intense polarized emission in self-assembled room temperature metallomesogens based on Zn(ii) coordination complexes: an experimental and computational study

Abstract: Polarized emission in highly luminescent room temperature columnar metallomesogens based on Zn(ii) metal centre.

Cited by 12 publications

References 61 publications

2-Aryl-1,3,4-trifluoro-6,7,10,11-tetrakis(alkoxy)triphenylene: a remarkable and highly inclusive mesomorphic platform

2-Aryl-1,3,4-trifluoro-6,7,10,11-tetrakis(alkoxy)triphenylene: a remarkable and highly inclusive mesomorphic platform

Design of Nanostructured Hybrid Electrodes Based on a Liquid Crystalline Zn(II) Coordination Complex-Carbon Nanotubes Composition for the Specific Electrochemical Sensing of Uric Acid

Light-Induced Clusterization of Gold Nanoparticles: A New Photo-Triggered Antibacterial against E. coli Proliferation

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