A strategy for high ethylene polymerization performance using titanium single-site catalysts

Alrais, Lujain; Maksoud, Walid Al; Werghi, Baraa; Bendjeriou-Sedjerari, Anissa; Abou-Hamad, Edy; Hedhili, Mohamed N.; Basset, Jean-Marie

doi:10.1039/d3cc03042c

Cited by 2 publications

(1 citation statement)

References 26 publications

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“…With this approach, for example, strong electrostatic interactions between cationic CPEs and DNA and DNA bases were achieved, allowing the detection of DNA and DNA bases based on the fluorescence quenching of the cationic CPEs [21]. In addition to such a fascinating method to detect DNA and DNA bases, efficient energy transfer from photoexcited cationic polyfluorene, one of the CPEs, to porphyrins demonstrated that the cationic polyfluorene can form electrostatic assembly with small molecules, and in the assembly, it acts as a photosensitizer [22].…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of Ultrafast Excited-State Electron Transfer in Both Polyfluorene-Graphene Carboxylate and Polyfluorene-DCB Interfaces

Alsam

2024

Molecules

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The Photophysical properties, such as fluorescence quenching, and photoexcitation dynamics of bimolecular non-covalent systems consisting of cationic poly[(9,9-di(3,3′-N,N′-trimethyl-ammonium) propyl fluorenyl-2,7-diyl)-alt-co-(9,9-dioctyl-fluorenyl-2,7-diyl)] diiodide salt (PFN) and anionic graphene carboxylate (GC) have been discovered for the first time via steady-state and time-resolved femtosecond transient absorption (TA) spectroscopy with broadband capabilities. The steady-state fluorescence of PFN is quenched with high efficiency by the GC acceptor. Fluorescence lifetime measurements reveal that the quenching mechanism of PFN by GC is static. Here, the quenching mechanisms are well proven via the TA spectra of PFN/GC systems. For PFN/GC systems, the photo electron transfer (PET) and charge recombination (CR) processes are ultrafast (within a few tens of ps) compared to static interactions, whereas for PFN/1,4-dicyanobenzene DCB systems, the PET takes place in a few hundreds of ps (217.50 ps), suggesting a diffusion-controlled PET process. In the latter case, the PFN+•–DCB−• radical ion pairs as the result of the PET from the PFN to DCB are clearly resolved, and they are long-lived. The slow CR process (in 30 ns time scales) suggests that PFN+• and DCB−• may already form separated radical ion pairs through the charge separation (CS) process, which recombine back to the initial state with a characteristic time constant of 30 ns. The advantage of the present positively charged polyfluorene used in this work is the control over the electrostatic interactions and electron transfers in non-covalent polyfluorene/quencher systems in DMSO solution.

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Section: Introductionmentioning

confidence: 99%

Comparative Investigation of Ultrafast Excited-State Electron Transfer in Both Polyfluorene-Graphene Carboxylate and Polyfluorene-DCB Interfaces

Alsam

2024

Molecules

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A new microporous organic–inorganic hybrid titanium phosphate for selective acetalization of glycerol

Malakar,

Bhattacharjee,

Tran

et al. 2025

Chem. Commun.

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A strategy for high ethylene polymerization performance using titanium single-site catalysts

Abstract: The synthesis of heterogeneous Ti(iv)-based catalysts for ethylene polymerization following surface organometallic chemistry concepts is described.

Cited by 2 publications

References 26 publications

Comparative Investigation of Ultrafast Excited-State Electron Transfer in Both Polyfluorene-Graphene Carboxylate and Polyfluorene-DCB Interfaces

Comparative Investigation of Ultrafast Excited-State Electron Transfer in Both Polyfluorene-Graphene Carboxylate and Polyfluorene-DCB Interfaces

A new microporous organic–inorganic hybrid titanium phosphate for selective acetalization of glycerol

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