Scholarlink

This study reports the synthesis, photophysical characterization, and fluorescence behavior of [octakis(chloromethyl)phthalocyaninato]zinc conjugated with gold nanoparticles (AuNPs). The compound was prepared via a chloromethylation reaction of zinc phthalocyanine, followed by conjugation with AuNPs stabilized with tannic acid or sodium citrate. UV-Vis absorption spectra revealed intense Q bands in the 580–780 nm range, with additional solvent-dependent features in the near-IR region. Steady-state fluorescence measurements showed red-shifted emission by 6–10 nm relative to the absorption maxima, with small Stokes shifts indicating minimal energy loss between absorption and emission. Fluorescence lifetimes, determined using time-correlated single-photon counting, exhibited bi-exponential behavior, reflecting two distinct molecular populations in DMSO:H₂O. Quantum yields were low, suggesting that the compounds are more suitable as diagnostic fluorescence probes than as photosensitizers for photodynamic therapy. Transient absorption spectroscopy revealed negative bands corresponding to ground-state bleach and stimulated emission, with an estimated lifetime of ~12 ns, and no observable triplet state absorption. These results provide insights into the photophysical properties and non-radiative deactivation pathways of the hybrid system. The study demonstrates the potential of [octakis(chloromethyl)phthalocyaninato]zinc:AuNPs assemblies for advanced photonic and biomedical applications and highlights the importance of controlled nanoparticle functionalization to tune their emission properties.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Charge-Transfer Complexation in Metal Phthalocyanine Derivatives/Au NPs Hybrid Structures

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Suman Victor,
  • Ion Lungu,
  • Tamara Potlog,
  • Lidia Ghimpu,
  • Anton Airinei

摘要

This study reports the synthesis, photophysical characterization, and fluorescence behavior of [octakis(chloromethyl)phthalocyaninato]zinc conjugated with gold nanoparticles (AuNPs). The compound was prepared via a chloromethylation reaction of zinc phthalocyanine, followed by conjugation with AuNPs stabilized with tannic acid or sodium citrate. UV-Vis absorption spectra revealed intense Q bands in the 580–780 nm range, with additional solvent-dependent features in the near-IR region. Steady-state fluorescence measurements showed red-shifted emission by 6–10 nm relative to the absorption maxima, with small Stokes shifts indicating minimal energy loss between absorption and emission. Fluorescence lifetimes, determined using time-correlated single-photon counting, exhibited bi-exponential behavior, reflecting two distinct molecular populations in DMSO:H₂O. Quantum yields were low, suggesting that the compounds are more suitable as diagnostic fluorescence probes than as photosensitizers for photodynamic therapy. Transient absorption spectroscopy revealed negative bands corresponding to ground-state bleach and stimulated emission, with an estimated lifetime of ~12 ns, and no observable triplet state absorption. These results provide insights into the photophysical properties and non-radiative deactivation pathways of the hybrid system. The study demonstrates the potential of [octakis(chloromethyl)phthalocyaninato]zinc:AuNPs assemblies for advanced photonic and biomedical applications and highlights the importance of controlled nanoparticle functionalization to tune their emission properties.