Work

Polysilane-pyrazoline hybrid synthesized via mechanochemically assisted hydrosilylation: Structural and optical insights for optoelectronic applications

Year: 2025

Type: article

Abstract: This study reports the synthesis of a polysilane-pyrazoline hybrid polymer ( PSTP ) through a mechanochemically assisted hydrosilylation process carried out under solvent-free conditions. Triphenylpyrazoline was efficiently grafted onto poly[diphenyl-co-methyl(H)]silane ( PSH ) using a platinum-based catalyst by grinding the solid reactants under anhydrous conditions. While a trace amount of xylene was introduced via the catalyst solution (Pt ∼ 2 % in xylene), the total solvent usage was maintained below the accepted threshold for mechanochemical synthesis (η ≤ 1 µL/mg). The reaction produced high yields (>70 %) with minimized side reactions typically associated with conventional hydrosilylation method. Detailed characterization using FTIR, 1 H-NMR, GPC-MALS, UV-Vis, and fluorescence spectroscopy confirmed the successful formation of PSTP with unique optical properties. The optical characterization revealed dual light-harvesting behavior consistent with a Förster Resonance Energy Transfer (FRET) mechanism from the polysilane backbone to the pyrazoline units. Computational analysis supported these observations and provided insights into the excited-state transitions. The polysilane backbone serves as the energy donor, while the pyrazoline derivative acts as the energy acceptor, resulting in efficient fluorescence emission. This innovative hybrid material exhibits promising optical properties, making it a potential candidate for optoelectronic devices, such as light-emitting diodes and optical sensors. The combination of a sustainable synthesis process, robust material characterization, and advanced optical functionality establishes PSTP as a versatile platform for future optoelectronic applications.

Source: Journal of Molecular Structure

DOI: 10.1016/j.molstruc.2025.144782

Authors: Liviu Sacarescu, Corneliu Cojocaru, Andreea Laura Chibac-Scutaru

Institution: Institutul de Chimie Macromoleculară Petru Poni

Language: English

Topic: Organoboron and organosilicon chemistry

Subfield: Organic Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,360

Funders: Corporation for National and Community Service, Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii, Ministry of Education and Research, Romania