Hybrid organic - Silica nanomaterials based on novel A3B mixed substituted porphyrin

Eugenia Fagadar-Cosma, Zoltán Dudás, Mihaela Birdeanu, L. Almásy

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A new A3B porphyrin structure, namely: 5-(4-phenoxyphenyl)-10,15,20-tris(4-pyridyl)-porphyrin was synthetized and characterized by FT-IR, UV-vis, Fluorescence, MS, 1H NMR, TLC and HPLC. Novel hybrid-silica porphyrin nanomaterials were obtained by immobilizing the porphyrin in silica supports synthesized from tetraethoxysilane, tetramethoxysilane or mixtures of tetraethoxysilane/methyltriethoxysilane. Since the behavior and performance of immobilized porphyrin molecules in the silica matrices strongly depend on the structure of the porous network, a comparative characterization of the silica support and the hybrid porphyrin-silica materials was carried out using specific physicochemical characterization methods: UV-vis, Fluorencence, FT-IR spectroscopy, thermal analysis, AFM, nitrogen adsorption and small-angle neutron scattering. The UV-vis spectra show that no protonation and aggregation of porphyrin takes place in the gels made from methyltriethoxysilane precursor. Most of the emission spectra preserve both the shape and the intensity of the corresponding free porphyrin. Due to the lack of aggregation, when using the methyltriethoxysilane precursor, the quenching of fluorescence is also diminished. No matter of the preparation method the specific surface areas increase in the following order: TEOS <TMOS <TEOS/MTES 3:1 <TEOS/MTES 2:1 <TEOS/MTES 1:1. Due to their optical properties, both the novel porphyrin and its derived hybrid materials, especially those synthesized in situ with mixtures of silica precursors TEOS/MTES will be sent for further medical trials in PDT, having characteristics of second generation photosensitizers. Due to large specific surface areas, the same materials will be used as sensitive materials in microsensors for air quality control, to detect the presence of CO, NOx, excess of CO2 and low level of O2.

Original languageEnglish
Pages (from-to)143-152
Number of pages10
JournalMaterials Chemistry and Physics
Volume148
Issue number1-2
DOIs
Publication statusPublished - Nov 14 2014

Fingerprint

Porphyrins
Nanostructured materials
porphyrins
Silicon Dioxide
Silica
silicon dioxide
Specific surface area
Agglomeration
Fluorescence
Microsensors
Photosensitizing Agents
Protonation
Hybrid materials
fluorescence
Photosensitizers
air quality
Carbon Monoxide
Neutron scattering
Air quality
Polymers

Keywords

  • A. Non-crystalline materials
  • B. Sol-gel growth
  • C. Atomic force microscopy (AFM)
  • C. Thermogravimetric analysis (TGA)
  • D. Luminescence
  • D. Optical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Hybrid organic - Silica nanomaterials based on novel A3B mixed substituted porphyrin. / Fagadar-Cosma, Eugenia; Dudás, Zoltán; Birdeanu, Mihaela; Almásy, L.

In: Materials Chemistry and Physics, Vol. 148, No. 1-2, 14.11.2014, p. 143-152.

Research output: Contribution to journalArticle

Fagadar-Cosma, Eugenia ; Dudás, Zoltán ; Birdeanu, Mihaela ; Almásy, L. / Hybrid organic - Silica nanomaterials based on novel A3B mixed substituted porphyrin. In: Materials Chemistry and Physics. 2014 ; Vol. 148, No. 1-2. pp. 143-152.
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